Microstructural design in quenched and partitioned (Q&amp;P) steels to improve their fracture properties

Diego-Calderón, I. de; Sabirov, I.; Molina-Aldareguia, J.M.; Föjer, Cécilia; Thiessen, Richard G.; Petrov, Roumen

doi:10.1016/j.msea.2016.01.011

Cited by 45 publications

(25 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Gao et al [73,74] report that the two-step Q&P process enhances the Charpy impact absorbed values in low carbon Si-Mn steels. According to Bagliani et al [72] and Somani et al [75], the two-step Q&P process lowers the ductile-brittle transition temperature of Charpy impact absorbed value in a 0.28C−1.41Si−0.67Mn−1.49Cr−0.56Mo steel and [76] confirm that the two-step Q&P process increases the fracture toughness of a 0.25C−1.5Si−3Mn steel. Simplified route with direct cooling in quenching bath for making forged parts using a two-step Q&P process (Reprinted with permission from [44], Copyright IRED 2014).…”

Section: Two-mentioning

confidence: 82%

Low and Medium Carbon Advanced High-Strength Forging Steels for Automotive Applications

Sugimoto

Hojo

Srivastava³

2019

Metals

View full text Add to dashboard Cite

This paper presents the microstructural and mechanical properties of low and medium carbon advanced high-strength forging steels developed based on the third generation advanced high-strength sheet steels, in conjunction with those of conventional high-strength forging steels. Hot-forging followed by an isothermal transformation process considerably improved the mechanical properties of the forging steels. The improvement mechanisms of the mechanical properties were summarized by relating to the matrix structure, the strain-induced transformation of metastable retained austenite, and/or a mixture of martensite and austenite.

show abstract

Section: Two-mentioning

confidence: 82%

Low and Medium Carbon Advanced High-Strength Forging Steels for Automotive Applications

Sugimoto

Hojo

Srivastava³

2019

Metals

View full text Add to dashboard Cite

show abstract

“…In this project, V-bearing precipitation-hardening ferritic-pearlitic steels and bainitic steels without heat treatment after hot-forging were used on behalf of quenched and tempered martensitic steels for the weight reduction and size-down. For further weight reduction, TBF, TBM, and TM steels [23][24][25] are also very attractive as well as Q&P [26,27], CFB [26,[28][29][30][31][32][33], and martensite type M-Mn steels [15], because their steels possess excellent mechanical properties such as tensile strength, impact toughness, fatigue strength, and delayed fracture strength.…”

Section: Introductionmentioning

confidence: 99%

Effects of Cr and Mo on Mechanical Properties of Hot-Forged Medium Carbon TRIP-Aided Bainitic Ferrite Steels

Sugimoto

Sato²,

Kobayashi

et al. 2019

Metals

View full text Add to dashboard Cite

In this study, the effects of Cr and Mo additions on mechanical properties of hot-forged medium carbon TRIP-aided bainitic ferrite (TBF) steel were investigated. If 0.5%Cr was added to the base steel with a chemical composition of 0.4%C, 1.5%Si, 1.5%Mn, 0.5%Al, and 0.05%Nb in mass%, the developed steel achieved the best combination of strength and total elongation. The best combination of strength and impact toughness was attained by multiple additions of 0.5%Cr and 0.2%Mo to the base steel. The excellent combination of strength and impact toughness substantially exceeded those of quenched and tempered JIS-SCM420 and 440 steels, although it was as high as those of 0.2%C TBF steels with 1.0%Cr and 0.2%Mo. The good impact toughness was mainly caused by uniform fine bainitic ferrite matrix structure and a large amount of metastable retained austenite.

show abstract

“…Another approach is to develop thermo-mechanically rolled fine-grained steel with a mixed microstructure consisting of martensite and/or bainite and a considerable amount of stabilized retained austenite (RA) [11,12]. In the last few years, many reports about the development of quenching and partitioning (Q&P) processes for the production of heat-treated steel with the optimal combination of high strength and ductility [13][14][15][16][17][18][19] can be found. All studies emphasize the key role of RA and its morphology, size, and distribution.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Retained Austenite in Fine Grained Inductive Heat Treated Spring Steel

et al. 2019

View full text Add to dashboard Cite

Advanced thermomechanical hot rolling is becoming a widely used technology for the production of fine-grained spring steel. Different rapid phase transformations during the inductive heat treatment of such steel causes the inhomogeneous mixture of martensitic, bainitic, and austenitic phases that affects the service properties of the steel. An important task is to assess the amount of retained austenite and its distribution over the cross-section of the inductive quenched and tempered wire in order to evaluate the mechanical properties of the material. Three different analytical methods were used for the comparative quantitative assessment of the amount of retained austenite in both the core and rim areas of the sample cross-section: neutron diffraction—for the bulk of the material, Mössbauer spectroscopy—for measurement in a surface layer, and the metallographic investigations carried by the EBSD. The methods confirmed the excessive amount of retained austenite in the core area that could negatively affect the plasticity of the material.

show abstract

Microstructural design in quenched and partitioned (Q&P) steels to improve their fracture properties

Cited by 45 publications

References 55 publications

Low and Medium Carbon Advanced High-Strength Forging Steels for Automotive Applications

Low and Medium Carbon Advanced High-Strength Forging Steels for Automotive Applications

Effects of Cr and Mo on Mechanical Properties of Hot-Forged Medium Carbon TRIP-Aided Bainitic Ferrite Steels

Assessment of Retained Austenite in Fine Grained Inductive Heat Treated Spring Steel

Contact Info

Product

Resources

About