Improving Tensile Properties of Room-Temperature Quenching and Partitioning Steel by Dislocation Engineering

He, Binbin; Wang, M.; Huang, Mingxin

doi:10.1007/s11661-019-05365-z

Cited by 18 publications

(24 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Note that the austenite stability in Q&P steel and CFB steel could be contributed by the hydrostatic pressure and dislocations, both of which are correlated to the formation of martensite/bainite. The austenite stability can be reset by engineering dislocations using a warm rolling process [ 197 , 198 , 199 ]. The austenite stability can be improved with grain refinement achieved through the near Ac3 temperature annealing [ 200 ], thermal cycling [ 201 ], and nano-precipitations [ 202 , 203 ].…”

Section: Alloy Design Strategiesmentioning

confidence: 99%

On the Factors Governing Austenite Stability: Intrinsic versus Extrinsic

2020

Materials

View full text Add to dashboard Cite

In this review, we separate the different governing factors on austenite stability into intrinsic and extrinsic factors, depending on the domain defined by austenite grain boundaries. The different measuring techniques on the effectiveness of the governing factors in affecting the austenite stability are discussed. On the basis of the austenite stability, a new alloy design strategy that involves the competition between the intrinsic and extrinsic factors to control the transformation-induced plasticity (TRIP) effect to realize the stronger the more ductile steel is proposed. The present review may provide new insights into the development of novel thermal-mechanical processing to advance the mechanical properties of steels for industrial applications.

show abstract

Section: Alloy Design Strategiesmentioning

confidence: 99%

On the Factors Governing Austenite Stability: Intrinsic versus Extrinsic

2020

Materials

View full text Add to dashboard Cite

show abstract

“…Third-generation AHSS (Type B): TRIP-aided martensitic (TM) steel [27][28][29] and martensite-type medium manganese (M-MMn) steel [30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

“…The matrix structures and the TSs of Type A are bainitic ferrite (BF) and bainitic ferrite/martensite (BF/M), and higher than 1.0 GPa, respectively, except for D-MMn and L-MMn steels with an annealed martensite [17][18][19][20][21][22][23][24][25] and/or δ-ferrite [24] matrix structure. On the other hand, the main matrix structure of Type B is martensite and its TS is higher than 1.5 GPa [27][28][29][30][31][32][33]. The M-MMn steel contains a larger amount of retained austenite than the TM steel [30][31][32][33], although its amount is much less than those of the D-MMn and L-MMn steels [17][18][19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Cold Formabilities of Martensite-Type Medium Mn Steel

Sugimoto

Tanino

Kobayashi

2021

Metals

View full text Add to dashboard Cite

Cold stretch-formability and stretch-flangeability of 0.2%C-1.5%Si-5.0%Mn (in mass%) martensite-type medium Mn steel were investigated for automotive applications. High stretch-formability and stretch-flangeability were obtained in the steel subjected to an isothermal transformation process at temperatures between Ms and Mf − 100 °C. Both formabilities of the steel decreased compared with those of 0.2%C-1.5%Si-1.5Mn and -3Mn steels (equivalent to TRIP-aided martensitic steels), despite a larger or the same uniform and total elongations, especially in the stretch-flangeability. The decreases were mainly caused by the presence of a large amount of martensite/austenite phase, although a large amount of metastable retained austenite made a positive contribution to the formabilities. High Mn content contributed to increasing the stretch-formability.

show abstract

“…In the conventional Q&P process, the quenching temperature usually deviates from the room temperature, which is challenging to control in commercial continuous annealing lines. To overcome the shortcoming, room temperature Q&P (RT Q&P) concept is recently proposed (He et al, 2018b(He et al, , 2019Hou et al, 2018;Kim et al, 2018). By designing the chemical composition of the medium Mn steel, the M f temperature is reduced below the room temperature and the martensitic transformation is not completed after water quenching.…”

Section: Introductionmentioning

confidence: 99%

“…By designing the chemical composition of the medium Mn steel, the M f temperature is reduced below the room temperature and the martensitic transformation is not completed after water quenching. The RT Q&P steel also achieves a good combination of strength and ductility (He et al, 2018b(He et al, , 2019Hou et al, 2018;Kim et al, 2018). Compared with the single IA process, the IA-Q&P process can improve the yield strength without sacrificing the elongation (De Cooman et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

On the Variants of Thermal Process in Developing Strong and Ductile Medium Mn Steel

Pan

2020

Front. Mater.

View full text Add to dashboard Cite

In this contribution, we investigate the influence of three heat treatments, including intercritical annealing (IA), quenching and partitioning (Q&P), and combination of IA and Q&P (IA-Q&P), on microstructure and mechanical properties of the medium Mn steel. The steel treated by the IA process has the largest volume fraction of austenite, which is responsible for the longest elongation and largest energy absorption with the operation of both transformation-induced plasticity (TRIP) effect and twinning-induced plasticity (TWIP) effects. The medium Mn steel produced by IA-Q&P treatment has a mixture microstructure with retained austenite, ferrite, and lath martensite. The existence of martensite in the IA-Q&P steel makes the higher yield strength than that of the IA steel. The better uniform elongation of the IA-Q&P steel than that of the Q&P steel is ascribed to the larger volume fraction of retained austenite and higher mechanical stability of austenite. The Q&P steel has the highest yield stress due to its martensite matrix. It is expected that the tensile properties of medium Mn steel can be tuned by different thermal processes (IA, Q&P, and IA-Q&P) to facilitate its broad automotive applications.

show abstract

Improving Tensile Properties of Room-Temperature Quenching and Partitioning Steel by Dislocation Engineering

Cited by 18 publications

References 41 publications

On the Factors Governing Austenite Stability: Intrinsic versus Extrinsic

On the Factors Governing Austenite Stability: Intrinsic versus Extrinsic

Cold Formabilities of Martensite-Type Medium Mn Steel

On the Variants of Thermal Process in Developing Strong and Ductile Medium Mn Steel

Contact Info

Product

Resources

About