Impact of Si and Al on Microstructural Evolution and Mechanical Properties of Lean Medium Manganese Quenching and Partitioning Steels

被引:29
作者
Kaar, Simone [1 ]
Krizan, Daniel [2 ]
Schneider, Reinhold [1 ]
Sommitsch, Christof [3 ]
机构
[1] Univ Appl Sci Upper Austria, Res & Dev, Roseggerstr 15, A-4600 Wels, Austria
[2] Voestalpine Stahl GmbH, Business Unit Coil, Res & Dev Dept, Voestalpine Str 3, A-4020 Linz, Austria
[3] Graz Univ Technol, Inst Mat Sci Joining & Forming, Kopernikusgasse 24-1, A-8010 Graz, Austria
关键词
lean medium Mn Q&P steels; retained austenite stabilities; stress-strain behaviors; Q-AND-P; TRIP; CARBON; BEHAVIOR; SILICON;
D O I
10.1002/srin.202000181
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
Herein, the investigation of the tensile behavior of lean medium Mn Quenching and Partitioning (Q&P) steels containing 0.2 wt% C, 4.5 wt% Mn, and additions of 1.5 wt% Si or 1.3 wt% Al is concentrated upon. By the variation of the quenching temperature (T-Q), different volume fractions of primary martensite (alpha '(prim)) are adjusted, influencing the subsequent microstructural evolution during Q&P processing. Using scanning electron microscopy (SEM), the final microstructure consisting of tempered martensite (alpha ''), retained austenite (RA), partially bainitic ferrite (alpha(B)), and final martensite (alpha '(final)) is characterized. Furthermore, interrupted tensile tests at gradually increased strains are conducted to investigate the stability of RA against strain-induced martensite transformation (SIMT) and overall tensile behavior of lean medium Mn Q&P steels. The investigations manifest the formation of larger amounts of alpha(B)and consequently lower RA contents, when Si is substituted by Al. As an aftermath, the tendency to form alpha '(final)is significantly lower, compared with the Si-alloyed composition, reflected in the overall stress-strain behavior. Especially in case of the Si-alloyed samples containing RA fractions exceeding 15 vol%, an over-accelerated SIMT is observed, inducing failures occurring prior to necking, whereas for the Al-alloyed samples, a wider process window is obtained.
引用
收藏
页数:7
相关论文
共 33 条
[1]  
Chen F. C., 1993, MAT SCI ENG A-STRUCT, P160
[2]  
De Cooman B. C., 2006, STEEL RES INT, V77, P9
[3]  
De Meyer M, 1999, ISIJ INT, V39, P813
[4]  
De Moor E., 2008, METALL MATER TRANS A, p39A
[5]  
De Moor E., 2006, 3 INT C ADV STRUCT S, P873
[6]  
De Moor E, 2011, ISIJ INT, V51, P137, DOI 10.2355/isijinternational.51.137
[7]  
DYSON DJ, 1970, J IRON STEEL I, V208, P469
[8]  
Gallyamov MO, 2002, PHYS LOW-DIMENS STR, V5-6, P153
[9]   Design of Composition in (Al/Si)-alloyed TRIP Steels [J].
Gomez, Manuel ;
Garcia, C. Isaac ;
Haezebrouck, Dennis M. ;
Deardo, Anthony J. .
ISIJ INTERNATIONAL, 2009, 49 (02) :302-311
[10]  
Jacques P.J., 1999, MAT SCI ENG A-STRUCT, P273