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bake hardening
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Image
Published: 01 January 2006
Fig. 1 Relationship between total elongation and ultimate tensile strength for some high-strength steel and advanced high-strength steel grades. BH, bake hardenable; HSLA, high strength low alloy; DP, dual phase; TRIP, transformation-induced plasticity; MART, martensitic
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Image
Published: 01 January 2006
Fig. 1 Trends in development of steel sheet properties. (a) Elongation and tensile strength of sheet steels. (b) Stress-strain curves for different cold-rolled steel grades (without predeformation, aged 170 °C, or 340 °F, for 20 min). IF, interstitial free; BH, bake hardened; DP, dual phase; TRIP
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Image
Published: 01 January 2006
Fig. 8 Yield strength and formability (in terms of tensile ductility) of conventional high-strength steels (HSS) and advanced high-strength steels (AHSS). Types of steels: BH, bake-hardening; CMn, carbon-manganese; CP, complex phase; DP, dual-phase; HSLA, high-strength, low-alloy steel; IF-HS
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Book Chapter
Series: ASM Handbook
Volume: 2B
Publisher: ASM International
Published: 15 June 2019
DOI: 10.31399/asm.hb.v02b.a0006710
EISBN: 978-1-62708-210-5
...Abstract Abstract The sheet alloys 6009 and 6010 fill the need for materials that would be formed in the soft T4 temper and age harden during the automotive paint-bake cycle. This datasheet provides information on key alloy metallurgy, processing effects on physical and mechanical properties...
Abstract
The sheet alloys 6009 and 6010 fill the need for materials that would be formed in the soft T4 temper and age harden during the automotive paint-bake cycle. This datasheet provides information on key alloy metallurgy, processing effects on physical and mechanical properties, and fabrication characteristics of these 6xxx series alloys.
Book Chapter
Series: ASM Handbook
Volume: 2B
Publisher: ASM International
Published: 15 June 2019
DOI: 10.31399/asm.hb.v02b.a0006712
EISBN: 978-1-62708-210-5
..., and 6111 in the T4 temper are most commonly used for outer panels, delivering the combination of formability, bake hardening ability, and surface quality required. Alloy 6022 was developed along the lines of alloy 6016, with high excess Si to boost strength ( Table 1 ). The Cu level of alloy 6022 was very...
Abstract
The automotive sheet alloy 6022 provides improved corrosion resistance, higher formability, and greater strength for dent resistance after thermal exposure compared with other automotive sheet alloys. This datasheet provides information on key alloy metallurgy, processing effects on mechanical properties, and fabrication characteristics of this 6xxx series alloy.
Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.a0005163
EISBN: 978-1-62708-186-3
... in Table 3 ( Ref 1 ). Type classifications for high-strength steels and advanced high-strength steels Table 3 Type classifications for high-strength steels and advanced high-strength steels Designation Type High-strength steels BH Bake hardenable HSLA High strength low alloy...
Abstract
This article provides information on the classification of high-strength steels (HSS) and advanced high-strength steels (AHSS) and tabulates designation of HSS and AHSS as recommended by the American Iron and Steel Institute. It reviews the major grades of HSS and AHSS that are used or will potentially be used in industrial applications. The article discusses different stamping issues such as edge cracking and springback, encountered during forming of AHSS, and lists guidelines for reducing springback in stamped components. It concludes with a discussion on the major advantages and disadvantages of using HSS and AHSS in automotive applications.
Book Chapter
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005354
EISBN: 978-1-62708-187-0
... to be noted in handling sand-resin mixtures for no-bake molds or cones and lists some advantages of no-bake air-set cores and molds. The article describes the process procedures, advantages, and disadvantages of gas curing and air-setting hardening of sodium silicates. It examines the members of the air...
Abstract
No-bake sand molds are based on the curing of inorganic or organic binders with either gaseous catalysts or liquid catalysts. This article reviews the major aspects of no-bake sand bonding in terms of coremaking, molding methods, and sand processing. It discusses the points to be noted in handling sand-resin mixtures for no-bake molds or cones and lists some advantages of no-bake air-set cores and molds. The article describes the process procedures, advantages, and disadvantages of gas curing and air-setting hardening of sodium silicates. It examines the members of the air-setting organic binders, namely, furan no-bake resins, phenolic no-bake resins, and urethanes. The article provides an overview of gas-cured organic binders. It also illustrates the three commercial systems for sand reclamation: wet reclamation systems, dry reclamation systems, and thermal reclamation.
Book Chapter
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003094
EISBN: 978-1-62708-199-3
... drawability and the nonaging properties are further improved. Bake-Hardening (BH) Steels Bake-hardening (BH) steels are characterized by their ability to exhibit an increase in yield strength due to carbon strain aging during paint-baking operations at moderate temperature (125 to 180 °C, or 260 to 355...
Abstract
Low-carbon steel sheet and strip are used primarily in consumer goods. This article discusses quality descriptors and mechanical properties of low-carbon steel sheet and strip and carbon and low-alloy steel plate. Alloy steel sheet and strip are used primarily for those special applications that require the mechanical properties normally obtained by heat treatment. Steel sheet is coated in coil form before fabrication either by the steel mills or by specialists called coil coaters. Porcelain enamels are glass coatings applied primarily to products or parts made of sheet steel, cast iron, or aluminum to improve appearance and to protect the metal surface.
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005242
EISBN: 978-1-62708-187-0
..., such as bentonites, are discussed. The article describes the methods of sand bonding with inorganic compounds. It provides a description of resin-bonded sand systems: no-bake binder systems, heat-cured binder systems, and cold box binder systems. The article concludes with a discussion on the media used...
Abstract
This article reviews the basic types of mold aggregates and bonding methods for expendable molds and coremaking. It provides an overview of mold media and the basic types of sands and their properties. The most significant clays used in green sand operations, such as bentonites, are discussed. The article describes the methods of sand bonding with inorganic compounds. It provides a description of resin-bonded sand systems: no-bake binder systems, heat-cured binder systems, and cold box binder systems. The article concludes with a discussion on the media used for expendable molds, namely, ceramic shells and rammed graphite, for casting reactive metals such as titanium or zirconium.
Book Chapter
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005244
EISBN: 978-1-62708-187-0
... the formed sand core, which is mounted on a support plate (core plate) ( Fig. 1 ) for subsequent hardening by baking. Alternatively, the compacted sand-binder mix may be cured in the core box by the so-called hot box, cold box, or no-bake methods. Fig. 1 Basic principles of core molding. See text...
Abstract
Cores are separate shapes of sand that are placed in the mold to provide castings with contours, cavities, and passages that are not otherwise practical or physically obtainable by the mold. This article describes the basic principles of coremaking and the types of core sands, binders, and additives used in coremaking. It discusses the curing of compacted cores by core baking and the hot box processes. The article provides an overview of the core coatings, assembling and core setting, coring of tortuous passages, and cores in permanent mold castings and investment castings. It also discusses the design considerations in coremaking to eliminate cores and compares coring with drilling.
Series: ASM Handbook
Volume: 4A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v04a.a0005787
EISBN: 978-1-62708-165-8
... constituents, but excessively long times at temperature may be required for substantial softening. The subcritical treatment is most effective when applied to hardened or cold-worked steels, which recrystallize readily to form new ferrite grains. The rate of softening increases rapidly as the annealing...
Abstract
Steels may be annealed to facilitate cold working or machining, to improve mechanical or electrical properties, or to promote dimensional stability. This article, using iron-carbon phase diagram, describes the types of annealing processes, namely, subcritical annealing, intercritical annealing, supercritical or full annealing, and process annealing. Spheroidizing is performed for improving the cold formability of steels. The article provides guidelines for annealing and tabulates the critical temperature values for selected carbon and low-alloy steels and recommended temperatures and time cycles for annealing of alloy steels and carbon steel forgings. Different combinations of annealed microstructure and hardness are significant in terms of machinability. Furnaces for annealing are of two basic types, batch furnaces and continuous furnaces. The article concludes with a description of the annealing processes for steel sheets and strips, forgings, bars, rods, wires, and plates.
Book Chapter
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003136
EISBN: 978-1-62708-199-3
..., and those used in semiconductor packaging operations. Thermal and electrical conductivities and room-temperature mechanical properties are unaffected by small additions of these elements. However, cadmium-copper and zirconium-copper work harden at higher rates than either silver-bearing copper...
Abstract
Copper and copper alloys are used extensively in structural applications in which they are subject to moderately elevated temperatures. At relatively low operating temperatures, these alloys can undergo thermal softening or stress relaxation, which can lead to service failures. This article is a collection of curves and tables that present data on thermal softening and stress-relaxation in copper and copper alloys. Thermal softening occurs over extended periods at temperatures lower than those inducing recrystallization in commercial heat treatments. Stress relaxation occurs because of the transformation of elastic strain in the material to plastic, or permanent strain.
Series: ASM Handbook
Volume: 5B
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v05b.a0006046
EISBN: 978-1-62708-172-6
.... Preferably the water produced during the reaction or added with the reacting bodies is separated before hardening the reaction product.” In February 1909, Baekeland officially announced his achievement at a meeting of the New York section of the American Chemical Society. His U.S. patent 942,699...
Abstract
Phenols are a class of aromatic organic compounds in which one or more hydroxyl groups are attached directly to the aromatic benzene ring, C6H6. This article describes the development of phenolic resin and the formation of novolac resin and resol resin. Phenolic resol resins are used in interior can coatings and tank linings as well as for heat exchanger tube coatings because of their high chemical and thermal resistance. The article concludes with a description of the concerns that a specifier, user, or applicator should be aware of regarding the use of phenolic coatings.
Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.a0005162
EISBN: 978-1-62708-186-3
..., precipitation-strengthened steels, the dual-phase and tri-phase steels, and the bake-hardenable steels. Also, new coating techniques have been developed to protect these new steels from corrosion. These topics are discussed in more detail in the articles “Forming of Advanced High-Strength Steels” and “Press...
Abstract
This article reviews the selection and formability characteristics of steels, with an emphasis on low-carbon steels and some coverage on the forming of high-carbon steels. It describes the key factors that affect the formability of steels in terms of steelmaking practices, surface finishes, metal thicknesses, and alloying. The article explains the bending and forming operations with some examples. It also describes the formation of various shells, including doubly contoured shells, deep recessed shells, and deep circular shells.
Series: ASM Handbook
Volume: 1A
Publisher: ASM International
Published: 31 August 2017
DOI: 10.31399/asm.hb.v01a.a0006297
EISBN: 978-1-62708-179-5
... are not discussed in this article. Self-Setting Systems Self-setting, or no-bake, chemically bonded systems are a mixture of sand, bonding agent, and a liquid hardening chemical (catalyst). They are used primarily for mold-making purposes in larger iron castings, but the production of simple, medium-sized...
Abstract
Aggregate molding, or sand casting, is the gravity pouring of liquid metal into a mold that is made of a mixture molded against a permanent pattern. This article summarizes the most important materials in the process of sand casting of cast iron, including different types of molding aggregates, clays, water, and additives in green sand, chemically bonded organic resins, and inorganic binders in self-setting, thermosetting, and gas-triggered systems. It discusses three main types of reclamation systems: wet, dry, and thermal. The article concludes with a description of both nonpermanent and permanent mold processes.
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005249
EISBN: 978-1-62708-187-0
... use, the preform pattern and other elements of the pattern assembly are coated or sprayed with a wax-silicone mixture to facilitate parting. Carbon dioxide gas is diffused into the mold material for hardening. One method of doing this consists of piercing the mold material in several locations...
Abstract
This article discusses slurry molding that encompasses two distinct processes: plaster molding and ceramic molding. Plaster mold casting is a specialized casting process used to produce nonferrous castings that have greater dimensional accuracy, smoother surfaces, and more finely reproduced detail. The article describes three generally recognized plaster mold processes, namely, conventional plaster mold casting, the Antioch process, and the foamed plaster process. Ceramic molding techniques are based on processes that employ permanent patterns and fine-grained zircon and calcined, high-alumina mullite slurries for molding. The Shaw process and the proprietary Unicast processes are also discussed.
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003692
EISBN: 978-1-62708-182-5
... not undergo any chemical change after, or at the time of, application. On application, the solvent carrier volatilizes, and the coating system sets, hardens, and attains its final resistant properties as the solvent evaporates. Heating or baking is often used to hasten solvent evaporation. However, because...
Abstract
This article discusses the coating systems categorized by the generic type of binder or resin and grouped according to the curing or hardening mechanism inherent within that generic type. It focuses on the properties, advantages, and limitations of various autooxidative cross-linked resins, thermoplastic resins, and cross-linked thermosetting resins. The autooxidative cross-linked resins include alkyd resins and epoxy esters. The article examines the two types of coatings based on thermoplastic resins: those deposited by evaporation of a solvent, commonly called lacquers, and those deposited by evaporation of water, a class of coatings called water-borne coatings. The coatings that chemically cross link by copolymerization, including epoxies, unsaturated polyesters, urethanes, high-temperature curing silicones, and phenolic linings, are also described.
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001812
EISBN: 978-1-62708-180-1
... of 55 HRA. The spider was made of 8620 steel and had been carburized and hardened to 62 to 63 HRC. The screws were made of a steel containing 0.36% C, 1.09% Mn, 0.01% P, 0.17% S, 0.21% Si, 0.01% Ni, and 0.16% Cr, which is a modified 1035 steel. The screw material had a tensile strength of 855 MPa (124...
Abstract
This article discusses different types of mechanical fasteners, including threaded fasteners, rivets, blind fasteners, pin fasteners, special-purpose fasteners, and fasteners used with composite materials. It describes the origins and causes of fastener failures and with illustrative examples. Fatigue fracture in threaded fasteners and fretting in bolted machine parts are also discussed. The article provides a description of the different types of corrosion, such as atmospheric corrosion and liquid-immersion corrosion, in threaded fasteners. It also provides information on stress-corrosion cracking, hydrogen embrittlement, and liquid-metal embrittlement of bolts and nuts. The article explains the most commonly used protective metal coatings for ferrous metal fasteners. Zinc, cadmium, and aluminum are commonly used for such coatings. The article also illustrates the performance of the fasteners at elevated temperatures and concludes with a discussion on fastener failures in composites.
Series: ASM Handbook
Volume: 1
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v01.a0001043
EISBN: 978-1-62708-161-0
... on size and baking temperature. Baking cannot be combined with age hardening, because considerable hydrogen remains in the steel after heat treating at the higher temperatures. Considerable surface hardening can be achieved by nitriding maraging steels in dissociated ammonia. Hardness levels...
Abstract
Maraging steels comprise a special class of high-strength steels that differ from conventional steels in that they are hardened by a metallurgical reaction that does not involve carbon. Instead, these steels are strengthened by the precipitation of intermetallic compounds at temperatures of about 480 deg C. Commercial maraging steels are designed to provide specific levels of yield strength in the range of 1030 to 2420 MPa. However, some experimental maraging steels have yield strengths as high as 3450 MPa. These steels typically have very high nickel, cobalt, and molybdenum contents and very low carbon contents. This article outlines the processing of maraging steels: melting, hot working, cold working, machining, heat treating, surface treatment, and welding. It also covers mechanical and physical properties as well as tooling and aerospace applications, where maraging steels are extensively used.
Book: Surface Engineering
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001306
EISBN: 978-1-62708-170-2
... properties (electrical steels). This article provides a detailed discussion on the various surface treatments, including cleaning, nitriding, carburizing, coating, and plating, performed on specialty steels. carburizing case hardening cleaning coating corrosion resistance deburring electrical...
Abstract
Specialty steels encompass a broad range of ferrous alloys noted for their special processing characteristics (powder metallurgy alloys), corrosion resistance (stainless steels), wear resistance and toughness (tool steels), high strength (maraging steels), or magnetic properties (electrical steels). This article provides a detailed discussion on the various surface treatments, including cleaning, nitriding, carburizing, coating, and plating, performed on specialty steels.