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dual-phase steels
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Series: ASM Handbook
Volume: 1
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v01.a0001026
EISBN: 978-1-62708-161-0
... Abstract Dual-phase steels are a new class of high-strength low alloy (HSLA) steels characterized by a microstructure consisting of about 20% hard martensite particles dispersed in a soft ductile ferrite matrix. In addition to high tensile strength, in the range of 550 MPa (80 ksi), dual-phase...
Abstract
Dual-phase steels are a new class of high-strength low alloy (HSLA) steels characterized by a microstructure consisting of about 20% hard martensite particles dispersed in a soft ductile ferrite matrix. In addition to high tensile strength, in the range of 550 MPa (80 ksi), dual-phase steels exhibit continuous yielding behavior, a low 0.2% offset yield strength, and a higher total elongation than other HSLA steels of similar strength. The article discusses some of the more pertinent aspects of dual-phase steels, such as heat treatment, microstructure, mechanical properties, chemical composition, and manufacturability. In general, these steels have a carbon content of less than 0.1%, which ensures that they can be spot welded. However, newer high-carbon dual-phase steels in development are generating interest due to their unique combination of total elongation and tensile strength.
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in High-Strength Structural and High-Strength Low-Alloy Steels
> Properties and Selection: Irons, Steels, and High-Performance Alloys
Published: 01 January 1990
Fig. 8 Tensile and forming properties of dual-phase steels and interstitial-free (IF) steels. (a) Strength-elongation relationships for various hot-rolled sheet steels. (b) Strength-elongation relationships for various cold-rolled sheet steels. (c) Deep-drawing properties of steel sheet grades
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Published: 01 January 1986
Fig. 99 Composition profiles at manganese segregation in a dual-phase steel. (a) Profile obtained at low resolution showing manganese partitioning between austenite (martensite) and ferrite. (b) A high-resolution profile across the same boundary showing strong manganese segregation. Source
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Published: 01 December 2004
Fig. 7 Ferrite-martensite microstructure of a dual-phase steel (0.06% C, 1.5% Mn; water quenched from 760 °C, or 1400 °F). Source: Ref 49
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in Metallography and Microstructures of Low-Carbon and Coated Steels
> Metallography and Microstructures
Published: 01 December 2004
Fig. 16 Microstructure of a dual-phase steel sheet (0.11% C, 1.4% Mn, 0.58% Si, 0.12% Cr, and 0.08% Mo) showing islands of martensite (dark gray), pearlite (black), and retained austenite (white; see arrows) in a matrix of ferrite. (a) In as-cooled condition. (b) Same specimen
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in Metallography and Microstructures of Low-Carbon and Coated Steels
> Metallography and Microstructures
Published: 01 December 2004
Fig. 40 Microstructure of a dual-phase steel showing islands of martensite and pearlite in a ferrite matrix. An island of pearlite is circled in (a) and shown at high magnification in (b). 4% picral etch. (a) 1000×. (b) A surface replica at 4970×
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in Metallography and Microstructures of Carbon and Low-Alloy Steels[1]
> Metallography and Microstructures
Published: 01 December 2004
Fig. 57 Microstructure of dual-phase steel showing tint-etched martensite (light-gray islands) and unetched austenite (white islands). Pearlite shown as dark regions. 10% sodium metabisulfite tint etch. Original magnification 1000×
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Published: 01 December 1998
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Published: 01 January 1990
Fig. 1 Ferrite-martensite microstructure of a dual-phase steel (0.06% C, 1.5% Mn; water quenched from 760 °C, or 1400 °F). Source: Ref 1
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Published: 01 February 2024
Fig. 54 Temperature changes during continuous annealing of dual-phase steel sheets. M s , martensite start temperature; A, austenite; F, ferrite; M, martensite. Adapted from Ref 58
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in Effects of Composition, Processing, and Structure on Properties of Irons and Steels
> Materials Selection and Design
Published: 01 January 1997
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Published: 01 January 1989
Fig. 9 Effect of cutting speed on tool life in turning dual-phase sheet steels. Source: Ref 14 Tool C-5 uncoated and coated carbide Feed, mm/rev (in./rev) 0.23 (0.009) Insert style TNEX-333-2M Depth of cut, mm (in.) 0.38 (0.015) Cutting fluid Dry Wear, mm
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Published: 01 December 1998
Fig. 43 Comparison of the stress-strain curves of three discontinuously yielding sheet steels (plain carbon, SAE 950X, and SAE 980X) and a dual-phase steel (GM 980X). In addition to the differences in yielding behavior, note the higher percentage of uniform elongation in the dual-phase steel
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in Effects of Composition, Processing, and Structure on Properties of Irons and Steels
> Materials Selection and Design
Published: 01 January 1997
Fig. 44 Comparison of the stress-strain curves of three discontinuously yielding sheet steels (plain carbon, SAE 950X, and SAE 980X) and a dual-phase steel (GM 980X). In addition to the differences in yielding behavior, note the higher percentage of uniform elongation in the dual-phase steel
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Published: 01 January 2006
Fig. 50 Tensile strength versus elongation to failure of heat treated fine-grain ultrahigh-carbon (UHC) steels compared to low-carbon steel, high-strength low-alloy (HSLA) steels, and dual-phase steels
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in The Application of Thermodynamic and Material Property Modeling to Process Simulation of Industrial Alloys
> Metals Process Simulation
Published: 01 November 2010
Fig. 6 Comparison between calculated and experimentally observed percentage of austenite in duplex stainless steels. Reference numbers are given in the legend. (Data from Ref 63 represent dual-phase steels.)
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Published: 01 January 1990
Fig. 3 Stress-strain curves for the HSLA sheet steels SAE 50X and SAE 80X (with yield strengths of 340 and 550 MPa, or 50 and 80 ksi, respectively) and a dual-phase steel (with a yield strength of 550 MPa, or 80 ksi). Source: Ref 4
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Published: 31 October 2011
Fig. 13 Welding current range plot for three hot dipped galvannealed dual-phase steels. Source: Ref 6
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Published: 31 December 2017
Fig. 31 Wear rate as a function of applied load and martensite volume fraction in dual-phase steel. Adapted from Ref 43
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in Metallography and Microstructures of Low-Carbon and Coated Steels
> Metallography and Microstructures
Published: 01 December 2004
Fig. 27 A histogram showing the amount of retained austenite present in a dual-phase steel after grinding with new and worn grinding papers. The two bars for chemical polish represent the true percentage of retained austenite in the specimen. The lower percentages, from grinding with worn
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