锰对热轧TWIP钢组织及力学性能的影响
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摘要
通过扫描电子显微镜、电子背散射衍射和力学分析等方法研究了Mn元素对热轧TWIP钢组织及力学性能的影响。结果表明:随着Mn的质量分数由5%增加到20%,试验钢中奥氏体不断增多,马氏体逐渐减少,宏观上表现为强度降低、塑性和韧性提高;拉伸断口由解理断裂转变为韧窝断裂;当锰的质量分数高于15%时,常温下得到单一奥氏体组织,并且伴有片状的孪晶组织。
Effects of Manganese on the microstructure and mechanical properties of hot-rolled TWIP steel were investigated by scanning electron microscopy,electron back-scattered diffraction and mechanical testing. The results showed that as the mass fraction of Mn increased from 5% to 20%,the austenite in test steel increased and the martensite decreased gradually,macroscopically,the strength decreased,but the plasticity and toughness increased,and that the tensile fracture of test steel changed from cleavage fracture into dimple fracture. When the mass fraction of Mn was above15%,a single austenite structure could be obtained at normal temperature,and accompanied by lamellar twins.
Effects of Manganese on the microstructure and mechanical properties of hot-rolled TWIP steel were investigated by scanning electron microscopy,electron back-scattered diffraction and mechanical testing. The results showed that as the mass fraction of Mn increased from 5% to 20%,the austenite in test steel increased and the martensite decreased gradually,macroscopically,the strength decreased,but the plasticity and toughness increased,and that the tensile fracture of test steel changed from cleavage fracture into dimple fracture. When the mass fraction of Mn was above15%,a single austenite structure could be obtained at normal temperature,and accompanied by lamellar twins.
引文
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[2] BENEDYK J C. Light metals in automotive applications[J].Light Metal Age,2000(1):34-35.
[3]唐荻,米振莉,陈雨来.国外新型汽车用钢的技术要求及研究开发现状[J].钢铁,2005,40(6):2-4.
[4]陆匠心,王利,应白桦,等.高强度汽车钢板的特性及应用[J].汽车工艺与料,2004(6):13-15.
[5]王利,杨雄飞,陆匠心.汽车轻量化用高强度钢板的发展[J].钢铁,2006,41(9):1-8.
[6] DING H,TANG Z Y,LI W,et al. Microstructures and mechanical properties of Fe-Mn-(Al,Si)TRIP/TWIP steels[J]. Journal of Iron and Steel Research International,2006,13(6):66-70.
[7]HAMADA A S,KARJALAINEN L P. The influence of aluminum on hot deformation behavior and tensile properties of high-Mn TWIP steels[J]. Materials Science and Engineering A,2007,467(1):114-124.
[8] GRASSEL O,KRUGER L,FROMMEYER G,et al. High strength Fe-Mn-(Al, Si)TRIP/TWIP steels developmentproperties-application[J]. International Journal of Plasticity,2000,169(10/11):1391-1409.