Al含量对Fe-Mn-Al-C系低密度钢层错能及形变孪晶的影响  

Influence of aluminum content on stacking fault energy and mechanical twin of low-density Fe-Mn-Al-C steels

作　　者：章小峰[1,2] 冷德平 张龙[1] 黄贞益[1] 陈光[2] 

机构地区：[1]安徽工业大学冶金工程学院,安徽马鞍山243002 [2]南京理工大学材料科学与工程学院,江苏南京210094

出　　处：《材料热处理学报》2015年第12期128-133,共6页Transactions of Materials and Heat Treatment

基　　金：中国博士后科学基金(2014M561648)

摘　　要：研究了合金元素Al对3种不同Al含量的Fe-28Mn-x Al-1C(x=8,10,12)系低密度钢层错能的影响。结果表明,3种实验钢的层错能范围为67.76~90.64 m J/m^2,Al对层错能的影响呈多项式分布。与28Mn-10Al及28Mn-8Al合金相比,28Mn-12Al合金层错能较高,抗拉强度高但伸长率低,在相同变形量下,28Mn-8Al与28Mn-10Al合金均出现了孪晶组织,且28Mn-8Al中孪晶更明显,而28Mn-12Al合金中未发现孪晶。3种合金的变形机制均为平面滑移变形,这归因于Fe-Mn-Al-C系合金中存在的短程有序会导致"滑移面软化现象",使高层错能的28Mn-12Al合金变形机制也为平面滑移。Influence of Al on stacking fault energy（ SFE） of low-density Fe-28Mn-x Al-1C（ x = 8,10 and 12） system alloys was studied.The results show that the SFE of the three experimental steels is in the range of 67. 76-90. 64 m J / m^2 and the influence of Al content on the SFE can be described by a polynomial. The tensile and yield strength of 28Mn-12 Al steel with higher SFE is better than that of 28Mn-8Al and 28Mn-10 Al steels while the elongation is on the contrary. Under the same deformation,twins exist in the 28Mn-8Al and 28Mn-10 Al alloys,and more twins are observed in the 28Mn-8Al steel,while twins are not found in the 28Mn-12 Al alloy. Deformation mechanism is dislocation planar glide in the three alloys and the planar glide mode of deformation is likely to be attributed to ＂the glide softening phenomenon＂associated with short range ordering,that is why the deformation mechanism of 28Mn-12 Al with high SFE is planar glide.

关 键 词：高含Al低密度钢 层错能 变形机制 形变孪晶 

分 类 号：TG142.1[一般工业技术—材料科学与工程]