摘要
对奥氏体不锈钢表面进行了爆炸强化、滚压强化和喷丸强化。爆炸强化时表面层内出现形变孪晶栅栏,位错线具有方向性、呈密布排列,局部山现ε马氏体、α马氏体和奥氏体超细晶粒的区域;滚压强化后表面层内也有就、孪晶栅栏出现,但位错以胞状结构的形式分布在奥氏体基体上;喷丸强化的表面层内孪晶栅栏十分致密,位错线仍以方向性排布,并无位错胞出现。表面层内组织结构出现差异,主要与变形速度和变形量有关,高速和较大的变形量可诱发α,ε马氏体转变和形成超细奥氏体晶粒,慢速变形时能促使位错胞的形成。本文还讨论了孪晶栅栏的形成方式及其内部构造。
Explosive hardening,rolled hardening and shot peening were practised on thesurface hardening of 1Cr18Ni9Ti steel.After explosive hardening twin paling,dense dislocationlines with definite orientations and martensites were observed in the hardened layer;Some areasof ultra-fine austenite are also found in it.After rolled hardening twin paling and dislocationcells appear in the layer.The substructures in shot peened layer are the twin paling and dense.dislocation lines,no α,ε martensites were observed in austenite matrix.Different hardeningmethods result in different substructures in the surface hardened layer.High speed deformationleads up to form α,ε martensites and ultra-fine austenite grains and low speed deformationleads up to form dislocation cells.The internal details of twin paling was also discussed in thispaper.
出处
《材料科学进展》
EI
CAS
CSCD
1992年第6期476-480,共5页
基金
国家自然科学基金
59071042
关键词
爆炸
不锈钢
结构
explosive hardening
rolled hardening
structure
