Microstructural and mechanical characterization of C–Mn–Al–Si cold-rolled TRIP-aided steel

Srivastava, Ashok; Bhattacharjee, D.; Jha, G.; Gope, N.; Singh, Shiv Brat

doi:10.1016/j.msea.2006.09.101

Cited by 105 publications

(53 citation statements)

References 13 publications

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“…In the past decade, some advanced high-strength and ultrahigh-strength sheet steels (AHSS and AUHSS, respectively) such as transformation-induced plasticity (TRIP) [1] -aided sheet steel [2][3][4][5][6][7][8][9][10][11], quench and partitioning steel [12,13], and twinning-induced plasticity (TWIP) steel [14] have been developed in order to reduce the weight and improve the impact safety of automobiles. General ultrahigh-strength TRIP-aided steels such as TRIP-aided bainitic ferrite (TBF) steel are produced by an isothermal transformation (IT) process at a temperature above the martensite-start temperature (M s ) or at a temperature between M s and the martensitefinish temperature (M f ) [6].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of a TRIP-Aided Martensitic Steel

Sugimoto

Srivastava²

2015

Metallogr. Microstruct. Anal.

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This paper deals with the microstructural and mechanical properties of a transformation-induced plasticity-aided martensitic (TM) steel that is expected to serve as an advanced structural steel for automotive applications. The microstructure consisted of a wide lath-martensitestructured matrix and a mixture of narrow lath-martensite and metastable retained austenite of 2-5 vol% (MA-like phase). When 1%Cr and 1%Cr-0.2%Mo were added into 0.2%C-1.5%Si-1.5%Mn steel to enhance its hardenability, the resultant TM steels achieved a superior cold formability, toughness, fatigue strength, and delayed fracture strength as compared to conventional structural steel such as SCM420. These enhanced mechanical properties were found to be mainly caused by (1) plastic relaxation of the stress concentration, which resulted from expansion strain on the strain-induced transformation of the metastable retained austenite, and (2) the presence of a large quantity of a finely dispersed MA-like phase, which suppressed crack initiation or void formation and subsequent void coalescence.

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Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of a TRIP-Aided Martensitic Steel

Sugimoto

Srivastava²

2015

Metallogr. Microstruct. Anal.

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“…The high volume fraction and good stability of retained austenite allows the steady strain induced transformation of austenite without abrupt drop in strain hardenability leading to the plasticity enhancement of TRIP steel. 15) Sample B and D with a higher retained austenite volume fraction shown a higher EL. But UTS © EL of sample B was low for its rather low UTS.…”

Section: Mechanical Propertiesmentioning

confidence: 87%

Effect of Heat Treatment on Microstructure and Mechanical Properties of TRIP Seamless Steel Tube

Zhang

Manabe

et al. 2012

Mater. Trans.

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A low-carbon TRIP seamless steel tube, which is expected to be used in the hydroforming process, was successfully fabricated using piercing, cold-drawing and two-stage heat treatment process. In this study, to maximize the volume fraction and stability of retained austenite as well as to obtain a TRIP seamless steel tube with good combination of strength and ductility, the optimal heat treatment conditions (intercritical annealing "IA" and isothermal bainite treatment "IBT") were investigated. The influence of heat treatment on the microstructure of the TRIP seamless steel tube was studied via optical microscopy, TEM and XRD. The mechanical properties in axial and circumferential directions of TRIP seamless steel tube were also evaluated by conventional tensile test and the ring tensile test developed by the author, respectively. The results show that for a particular set of IA and IBT temperature, the volume fraction of retained austenite increased with increasing IA holding time but decreased with the increase of IBT holding time in the set of time range in this study. As a result, the high retained austenite volume fraction of 10.26% was obtained with IA holding time of 5 min at IA temperature of 810°C, IBT holding time of 6 min at temperature of 410°C. And this sample possessed a UTS of 542 MPa, YS of 355 MPa and EL of 35% in the circumferential direction obtained by the ring tensile test.

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“…4,[14][15][16][17][18][19][20][21][22][23] Although, Kim et al [18][19][20] and Lee et al 4,[15][16][17] have conducted many experiments on the effect of heat treatment and alloying elements, however, they have not discussed about the initial cold rolling conditions. Srivastava et al 22) focused on retained austenite feature and its effect on formability and mechanical properties which are obtained at different annealing and austempering times. Extensive works and valuable discussions have been published on the recrystallization and austenite formation of conventional C-Mn-Si TRIP steels during intercritical annealing.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cold Rolling on Annealing Behavior and Retained Austenite Characteristics of Multiphase CMnSi Steel

Emadoddin

2013

ISIJ Int.

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The newly developed multiphase transformation-induced plasticity (TRIP) steels are of interest for industrial applications because of their excellent combination of high strength and ductility. Retained austenite as a key constituent in final microstructure plays an important role in TRIP steels. The volume fraction, carbon concentration, size and morphology of this phase are the well known parameters which effects on the rate of transformation of retained austenite to martensite and the properties of steel. The performance of steel can be successfully controlled by designing an optimum balance in the volume fractions of ferrite, bainite and retained austenite.Against this background, in this research the effect of initial cold-rolling reduction and intercritical annealing temperature on the final microstructure and retained austenite characteristics has been studied on a silicon-containing TRIP steel by electron backscattered diffraction (EBSD) method. The results show that moderate percent of cold rolling followed by intermediate annealing temperature would provide optimum condition for desirable retained austenite characteristics with proper adjacent phase.

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Microstructural and mechanical characterization of C–Mn–Al–Si cold-rolled TRIP-aided steel

Cited by 105 publications

References 13 publications

Microstructure and Mechanical Properties of a TRIP-Aided Martensitic Steel

Microstructure and Mechanical Properties of a TRIP-Aided Martensitic Steel

Effect of Heat Treatment on Microstructure and Mechanical Properties of TRIP Seamless Steel Tube

Effect of Cold Rolling on Annealing Behavior and Retained Austenite Characteristics of Multiphase CMnSi Steel

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