Effect of Vanadium Carbide Precipitates on Microstructure Evolution and Mechanical Properties of Fe-Mn-Si-Al TRIP Steel

doi:10.3901/JME.2022.22.276

Abstract

Abstract: Fe-Mn-Si-Al TRIP steels with low yield strengths and good low-cycle fatigue lives have the potential to be used as seismic damping steels. The quasi-static tensile test and low-cycle fatigue test are performed on an Fe-Mn-Si-Al TRIP steel. The microstructure evolution before and after deformation of the experimental steel is characterized using multiple microstructure analyses,revealing the influence and mechanism of VC precipitates and austenite grain size on mechanical properties. The austenite grain coarsening promotes the formation of crossed multi-variant ε-martensite, thereby increasing the elongation of the experimental steel during the quasi-static tension. In contrast, during the low-cycle fatigue deformation, the low-cycle fatigue life of the experimental steel is decreased since crossed multi-variants weaken the reversibility of the ε-martensitic transformation. VC precipitates improve the strength of the experimental steel but hinder the growth of ε-martensite, leading to a reduction in elongation. VC precipitates pin the interfaces between the ε-martensite and austenite and inhibit reversible ε-martensite transformation during the low-cycle fatigue deformation, resulting in significant enhancement of cyclic work hardening and a decrease in the low-cycle fatigue life of the experimental steel.

Key words: Fe-Mn-Si-Al-C-V TRIP steel, microstructure evolution, mechanical properties, ε-martensitic transformation, vanadium carbide precipitate

CLC Number:

TG156

SUN Qi-di, FU Cong, JIN Jing-jing, YANG Yu-tao, HAO Qing-guo, ZHANG Bin, YANG Qi. Effect of Vanadium Carbide Precipitates on Microstructure Evolution and Mechanical Properties of Fe-Mn-Si-Al TRIP Steel[J]. Journal of Mechanical Engineering, 2022, 58(22): 276-283.

References

[1] 鲁法云,杨平,孟利,等. Fe-22Mn TRIP/TWIP钢拉伸过程组织、性能及晶体学行为分析[J].金属学报,2013,49(1):1-9.LU Fayun,YANG Ping,MENG Li,et al. Microstructure,mechanical properties and crystallography analysis of Fe-22Mn TRIP/TWIP steel after tensile deformation[J].Acta Metallurgica Sinica,2013,49(1):1-9.
[2] DE COOMAN B C, ESTRIN Y, KIM S K.Twinning-Induced plasticity(TWIP)steels[J]. Acta Materialia,2018,142(1):283-362.
[3] GRÄSSEL O,KRÜGER L,FROMMEYER G,et al. High strength Fe-Mn-(Al,Si)TRIP/TWIP steels developmentproperties-application[J]. International Journal of Plasticity,2000,16(10):1391-1409.
[4] ALLAIN S, CHATEAU J P, BOUAZIZ O, et al.Correlations between the calculated stacking fault energy and the plasticity mechanisms in Fe-Mn-C alloys[J].Materials Science and Engineering A,2004,387-389(24):158-162.
[5] SONG W,INGENDAHL T,BLECK W. Control of strain hardening behavior in high-Mn austenitic steels[J]. Acta Metallurgica Sinica(English Letters),2014,27(3):546-556.
[6] JIN J E,LEE Y K. Effects of Al on microstructure and tensile properties of C-Bearing high Mn TWIP steel[J].Acta Materialia,2012,60(4):1680-1688.
[7] KOYAMA M,SAWAGUCHI T,TSUZAKI K. Effects of Si on tensile properties associated with deformationinduced ε-martensitic transformation in high Mn austenitic alloys[J]. Journal of the Japan Institute of Metals,2015,79(12):657-663.
[8] CLADERA A,WEBER B,LEINENBACH C,et al.Iron-based shape memory alloys for civil engineering structures:An overview[J]. Construction and Building Materials,2014,63(14):281-293.
[9] 罗云蓉,王清远,刘永杰,等. Q235、Q345钢结构材料的低周疲劳性能[J].四川大学学报,2012,44(2):169-175.LUO Yunrong,WANG Qingyuan,LIU Yongjie,et al.Low cycle fatigue properties of steel structure materials Q235 and Q345[J]. Journal of Sichuan University,2012,44(2):169-175.
[10] KOYAMA M,YU Y,ZHOU J X,et al. Elucidation of the effects of cementite morphology on damage formation during monotonic and cyclic tension in binary low carbon Steels using in situ characterization[J]. Materials Science and Engineering A,2016,667(19):358-367.
[11] SAWAGUCHI T, NIKULIN I, OGAWA K, et al.designing Fe-Mn-Si alloys with improved low-cycle fatigue lives[J]. Scripta Materialia,2015,99(6):49-52.
[12] NIKULIN I, SAWAGUCHI T, OGAWA K, et al.Microstructure evolution associated with a superior low-cycle fatigue resistance of the Fe-30Mn-4Si-2Al alloy[J]. Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,2015,46(11):5103-5113.
[13] NIKULIN I,SAWAGUCHI T,TSUZAKI K. Effect of alloying composition on low-cycle fatigue properties and microstructure of Fe-30Mn-(6-x)Si-XAl TRIP/TWIP alloys[J]. Materials Science and Engineering A,2013,587(29):192-200.
[14] NIKULIN I,SAWAGUCHI T,OGAWA K,et al. Effect of γ to ε martensitic transformation on low-cycle Fatigue behaviour and fatigue microstructure of Fe-15Mn-10Cr-8Ni-xSi austenitic alloys[J]. Acta Materialia, 2016,105(4):207-218.
[15] TAKAKI S,NAKATSU H,TOKUNAGA Y. Effects of austenite grain size on ε martensitic transformation in Fe-15mass%Mn alloy[J]. Materials Transactions,JIM,1993,34(6):489-495.
[16] NAKATSU H, MIYATA T, TAKAKI S. Effect of austenite grain size on the deformation induced γ→εmartensitic transformation and mechanical properties in an Fe-27 Mass%Mn alloy[J]. Journal of the Japan Institute of Metals,1996,60(10):936-943.
[17] NAKATSU H, MIYATA T, TAKAKI S. Effect of austenite grain size on the γ→ε martensitic transformation and mechanical properties in an Fe-22 Mass%Mn alloy[J].Journal of the Japan Institute of Metals,1996,60(10):928-935.
[18] WEN Y H,ZHANG W,LI N,et al. Principle and realization of improving shape memory effect in Fe-Mn-Si-Cr-Ni alloy through aligned precipitations of second-phase particles[J]. Acta Materialia,2007,55(19):6526-6534.
[19] DONG Z Z,KAJIWARA S,KIKUCHI T,et al. Effect of pre-deformation at room temperature on shape memory properties of stainless type Fe-15Mn-5Si-9Cr-5Ni-(0.5-1.5)NbC alloys[J]. Acta Materialia, 2005,53(15):4009-4018.
[20] KAJIWARA S,LIU D,KIKUCHI T,et al. Remarkable improvement of shape memory effect in Fe-Mn-Si based shape memory alloys by producing NbC precipitates[J].Scripta Materialia,2001,44(12):2809-2814.
[21] LUTTEROTTI L. Total pattern fitting for the combined size-strain-stress-texture determination in thin film diffraction[J]. Nuclear Instruments and Methods in Physics Research,Section B:Beam Interactions with Materials and Atoms,2010,268(3-4):334-340.
[22] GUO Z,KIMURA N,TAGASHIRA S,et al. Kinetics and crystallography of intragranular pearlite transformation nucleated at(MnS+VC)complex precipitates in hypereutectoid Fe-Mn-C Alloy[J]. ISIJ International,2002,42(9):1033-1041.
[23] OLSON G B,COHEN M. A general mechanism of martensitic nucleation:Part I. General concepts and the FCC→HCP transformation[J]. Metallurgical Transactions A,1976,7(12):1897-1904.
[24] LI X,CHEN L,ZHAO Y,et al. Influence of original austenite grain size on tensile properties of a high-manganese transformation-induced plasticity(TRIP)steel[J]. Materials Science and Engineering A,2018,715(7):257-265.
[25] ONO Y,NAKATSU H,TAKAKI S. Effect of Nb C Particles on γ→ε martensitic transformation in Fe-22Mass%Mn alloys[J]. Journal of the Japan Institute of Metals,1997,61(7):580-585.