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microalloy

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Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0003995
EISBN: 978-1-62708-185-6
... and reviews how improvements in the strength and toughness depend on the synergistic effect of microalloy additions and on carefully controlled thermomechanical conditions. It discusses TMP variables and the general distinctions between conventional hot rolling and common types of controlled-rolling...
Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006268
EISBN: 978-1-62708-169-6
... precipitates that occur in the natural aging and artificial aging of Al-Mg-Si-(Cu) alloys, Al-Mg-Cu alloys, microalloyed Al-Mg-Cu-(Ag, Si) alloys, aluminum-lithium-base alloys, and Al-Zn-Mg-(Cu) alloys. Crystal structure, composition, dimensions, and aging conditions of precipitates are detailed. Effects of...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0003991
EISBN: 978-1-62708-185-6
... approach to microstructural control, finishing temperatures for microalloyed bar steels must nonetheless be controlled. It has been shown that, although strength is not significantly affected by finishing temperature, toughness of vanadium-containing microalloyed steels decreases with increasing finishing...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003100
EISBN: 978-1-62708-199-3
... by higher yield strengths than those of plain carbon structural steels. There are three categories: (a) carbon steel grades having minimum yield strengths of 275 to 550 MPa (40 to 80 ksi); (b) microalloyed high-strength low-alloy (HSLA) steels, with improved properties that result from a combination...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005414
EISBN: 978-1-62708-196-2
..., it is not a true mechanism-based model. The value of activation energy can be misleading in such regression-based models. A higher value of the exponent m generally results in a higher value of Q . Therefore, in materials such as microalloyed steels that exhibit the pinning effect due to...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003090
EISBN: 978-1-62708-199-3
... Fig. 1 and is microalloyed with vanadium and/or niobium for strengthening. ( Microalloying is a term used to describe the process of using small additions of carbonitride forming elements—titanium, vanadium, and niobium—to strengthen steels by grain refinement and precipitation hardening.) Fig...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004029
EISBN: 978-1-62708-185-6
... temperatures below the A r1 . Fig. 4 The three stages of controlled rolling and of the associated changes in microstructure The T nr in Fig. 4 refers to a microalloyed steel containing niobium and can be as high as 1000 °C (1830 °F), depending on the alloy composition. The retardation of...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003091
EISBN: 978-1-62708-199-3
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0009002
EISBN: 978-1-62708-185-6
... rate and temperature to a first order ( Ref 11 ). Thus, the strain rate and temperature dependence of the rate of dislocation multiplication is determined principally by Ω = Ω ( ε ˙ ,   T ) . An example of such a dependence for a microalloyed (Nb-B) steel is shown in Fig. 5(a...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003096
EISBN: 978-1-62708-199-3
... currently produced in sizes ranging from 3 mm ( 1 8 in.) nominal to 1.2 m (48 in.) actual outside diameter and is used principally for conveying gas or oil. Transmission pipe, which is covered by API Specification 5L and CSA specification Z245.1 is being increasingly manufactured from microalloyed...
Series: ASM Handbook
Volume: 13B
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v13b.a0003824
EISBN: 978-1-62708-183-2
... and nickel-base superalloys, such as alloys 625 and 718, where it strengthens by solid-solution formation, carbide precipitation, and coherent phase formation. In carbon steels, high-strength low-alloy (HSLA) steels, and stainless steels, niobium is an important microalloying element that improves...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003164
EISBN: 978-1-62708-199-3
... the ductility of Ni 3 Al only in alloys containing less than 25 at.% aluminum. Since gaining the knowledge that microalloying with boron can ductilize polycrystalline Ni 3 Al, a number of Ni 3 Al alloy compositions have been developed. As shown in Table 3 , macroalloying additions include chromium...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005258
EISBN: 978-1-62708-187-0
... example, offshore drilling equipment in the North Sea. These materials must be weldable, with ductile-to-brittle transition temperatures below −40 °C (−40 °F). Likely candidate materials for use under such conditions are manganese-molybdenum steels with microalloying additions of vanadium, nickel, or...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003095
EISBN: 978-1-62708-199-3
... better surface finish are desired in addition to increased strength. As-rolled microalloyed high-strength low-alloy (HSLA) steels or microalloyed HSLA steels in various combinations of controlled drafting and furnace treatment provide an extension of property attainment. A high percentage of free...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0009011
EISBN: 978-1-62708-185-6
... time between stands, etc.) on equipment requirements. In addition, the final microstructure from the torsion simulation was almost identical to that from the production run ( Fig. 74 ). Fig. 71 Deformation-temperature-time sequence imposed during torsion testing of microalloyed steels. The...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0003971
EISBN: 978-1-62708-185-6
... overall manufacturing process in order to enhance final microstructure and properties. Thermomechanical processing was developed initially as a method for producing high-strength or high-toughness microalloyed steels via (ferrite) grain refinement and controlled precipitation. Current trends in the TMP of...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003184
EISBN: 978-1-62708-199-3
... reductions of increasing severity at various temperatures Microalloyed forging steels often can be forged at lower temperatures than conventional carbon or alloys steels. The combination of metal displacement and heating during forging, followed by controlled cooling, strengthens the workpiece...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004001
EISBN: 978-1-62708-185-6
... temperatures of 1125 to 1175 °C (2055 to 2150 °F). The extruded grain size decreased with decreasing extrusion temperature. Related work by Schulson and Barker ( Ref 18 ) showed that grain sizes as small as approximately 10 μm (0.4 mils) could be obtained by using microalloying and a two-step extrusion...
Series: ASM Handbook
Volume: 14A
Publisher: ASM International
Published: 01 January 2005
DOI: 10.31399/asm.hb.v14a.a0004027
EISBN: 978-1-62708-185-6
... pass. This produces grain refinement, which is partly negated by subsequent grain growth before the next pass. In the case of microalloyed steels, recrystallization is much slower, particularly when strain-induced precipitation takes place. Physically based models for the kinetics of strain-induced...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005407
EISBN: 978-1-62708-196-2
... confidence level, is described by Ref 15 . As a few examples, ANN modeling has been employed to study the mechanical properties of microalloyed steels as functions of alloy composition and rolling process parameters, the effect of carbon content on the hot strength of austenitic steels, continuous cooling...