超高锰钢原位拉伸断裂及机理分析
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摘要
采用沉淀强化热处理对超高锰钢进行强韧化处理,利用扫描电镜观察材料的裂纹扩展,研究在单向拉伸载荷下材料的断裂机理。结果表明,材料受载后在奥氏体内形成高密度滑移,裂纹主要萌生在预制缺陷处、滑移线密集处;裂纹的扩展以晶内扩展为主,碳化物/奥氏体相界面扩展次之。组织中弥散分布的碳化物对裂纹的扩展有阻碍作用,当裂纹与碳化物相遇时,裂纹转向薄弱区。
The super-high manganese steels were strengthen-toughened by precipitation strengthened treatment. The crack propagation of the steel was observed by SEM, and the fracture mechanism of the steel under uniaixal tension was analyzed. The results show that high density slip-lines appear after loading, and the crack initiates at prefabricated defect and the high density slip-lines. The crack propagation is mainly across the austenite crystal and propagates along the matrix/particles interface secondarily. The crack growth could be influenced by carbide particles dispersively distributing in the austenite crystal, when it encounters the carbide particles, the growth direction turns toward the weaker areas.
The super-high manganese steels were strengthen-toughened by precipitation strengthened treatment. The crack propagation of the steel was observed by SEM, and the fracture mechanism of the steel under uniaixal tension was analyzed. The results show that high density slip-lines appear after loading, and the crack initiates at prefabricated defect and the high density slip-lines. The crack propagation is mainly across the austenite crystal and propagates along the matrix/particles interface secondarily. The crack growth could be influenced by carbide particles dispersively distributing in the austenite crystal, when it encounters the carbide particles, the growth direction turns toward the weaker areas.
引文
[1]闰华,谢敬佩,王文焱,等.合金化高锰钢ZGMn13Cr Mo的组织与性能研究[J].热加工工艺,2006,35(4):11-13.
[2]李震刚,史东丽,曹松.超高锰钢大型轧臼壁的试制[J].热加工工艺,2013,42(13):60-62.
[3]张长涛,谢敬佩,王文焱,等.铸造工艺对超高锰钢镶铸复合材料锤头的组织及结合的影响[J].热加工工艺,2010,39(5):42-47.
[4]Wen Y H,Peng H B,Si H T,et al.A novel high manganese austenitic steel with higher work hardening capacity and much lower impact deformation than Hadfield manganese steel[J].Materials and Design,2014,55:798-804.
[5]闫华,张培磊,于治水.改性高锰钢裂纹萌生与扩展的原位拉伸研究[J].热加工工艺,2014,43(2):64-66.
[6]Canadinc D,Sehitoglu H,Maier H J,et al.Strain hardening behavior of aluminum alloyed Hadfield steel single crystals[J].Acta Materialia,2005,53(6):1831-1842.
[7]Meng L,Yang P,Xie Q,et al.Dependence of deformation twinning on grain orientation in compressed high manganese steels[J].Scripta Materialia,2007,56(11):931-934.
[8]Zhang G S,Xing J D,Gao Y M.Impact wear resistance of WC/Hadfield steel composite and its interfacial characteristics[J].Wear,2006,260(7-8):728-734.
[2]李震刚,史东丽,曹松.超高锰钢大型轧臼壁的试制[J].热加工工艺,2013,42(13):60-62.
[3]张长涛,谢敬佩,王文焱,等.铸造工艺对超高锰钢镶铸复合材料锤头的组织及结合的影响[J].热加工工艺,2010,39(5):42-47.
[4]Wen Y H,Peng H B,Si H T,et al.A novel high manganese austenitic steel with higher work hardening capacity and much lower impact deformation than Hadfield manganese steel[J].Materials and Design,2014,55:798-804.
[5]闫华,张培磊,于治水.改性高锰钢裂纹萌生与扩展的原位拉伸研究[J].热加工工艺,2014,43(2):64-66.
[6]Canadinc D,Sehitoglu H,Maier H J,et al.Strain hardening behavior of aluminum alloyed Hadfield steel single crystals[J].Acta Materialia,2005,53(6):1831-1842.
[7]Meng L,Yang P,Xie Q,et al.Dependence of deformation twinning on grain orientation in compressed high manganese steels[J].Scripta Materialia,2007,56(11):931-934.
[8]Zhang G S,Xing J D,Gao Y M.Impact wear resistance of WC/Hadfield steel composite and its interfacial characteristics[J].Wear,2006,260(7-8):728-734.