Cellular η phase precipitation and its effect on the tensile properties in an Fe–Ni–Cr alloy
Cellular η phase precipitation and its effect on the tensile properties in an Fe–Ni–Cr alloy
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DOI：
10.1016/j.msea.2007.11.039
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发表时间：
2008-08
期刊：
影响因子：
6.4
通讯作者：
Xiuyan Li;Jian Zhang;L. Rong;Yiyi Li
中科院分区：
文献类型：
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作者：
Xiuyan Li;Jian Zhang;L. Rong;Yiyi Li
采用TEM、SEM、EBSD和拉伸试验研究了Fe-Ni-Cr合金晶界胞状η相的析出机理及其对高温拉伸性能的影响。结果表明，η相在高能量晶界处形核，与奥氏体基体呈共向取向关系：{001}η//{111}γ， <210>η//<110>γ。η相附近的胞状奥氏体与η相开始生长的晶粒具有相同的取向。胞状奥氏体的形成是伴随η相析出的晶界向与η相不一致的相邻晶粒迁移的过程。晶界胞状η相的析出显著提高了合金的高温塑性。
The precipitation mechanism of cellular η phase at grain boundaries and its effect on the high temperature tensile properties in an Fe–Ni–Cr alloy were investigated by using TEM, SEM, EBSD and tensile testing. It was revealed that η phase nucleates at high energy grain boundaries and has a coherent orientation relationship with the austenite matrix: {001}η//{111}γ, <210>η//<110>γ. The cellular austenite in the vicinity of the η phase has the same orientation as the grain from which the η phase growth starts. The formation of cellular austenite is suggested to proceed by grain boundary migrating with precipitated η phase into the neighboring grain which is incoherent with the η phase. The precipitation of cellular η phase at grain boundary improves the high temperature ductility of the alloy dramatically.