杨钢黄崇湘吴世丁张哲峰
金属学报
研究了304L奥氏体不锈钢在严重塑性变形(等通道转角挤压, ECAP)下发生形变诱导马氏体转变的微观特征, 包括形核特征、长大方式和相变晶体学, 探讨了粗大晶粒和亚微米晶粒发生马氏体相变的异同和微观机理. 结果表明: 粗大奥氏体晶粒发生相变时, 马氏体主要形核于微观剪切带(包括层错、变形孪晶和ε相等)的相互交割处, 马氏体与奥氏体之间为K---S(Kurduumov---Sachs)关系, 而不是西山(Nishiyama---Wassermann)关系; 亚微米奥氏体晶粒发生相变时, 马氏体则多在奥氏体晶界处形核, 马氏体与奥氏体之间仍为K---S关系.
关键词:
奥氏体不锈钢
,
equal channel angular pressing
,
submicron grain
,
martensitic transformation
,
microscopic mechanism
X. J. Sun
,
J. L. Gu
,
B. Z. Bai
,
B. Dai and N. P. Chen (Department of Materials Science and Engineering
,
Tsinghua University
,
Beijing 100084
,
China
金属学报(英文版)
This paper reviews various fabrication methods of ultrafine grained materials and their limitations briefly, and examines the possibility to produce ultrafine grained titanium alloy by compressive deformation preliminarily. It has been shown that submicrongrained TC11 alloy can be obtained by compressive deformation below 725°C. During microstructure refinement, dynamic recrystallization occurs only in α phases, and β phases undergo a process of precipitation and growth. Compared with the situation of static annealing, deformation can not only enhance the precipitation and growth of β phases but also change the morphology of βprecipitates.
关键词:
TC11 alloy
,
null
,
null
,
null
