苑少强,郁春锋,杨跃辉,郝斌

• 1:唐山学院机电工程系
• 2:中国石油长城钻探工程有限公司

摘要(Abstract)：

利用金相观察、定量统计及透射电子显微镜分析,研究了含Ti和无Ti的Fe-40Ni合金在高温等温过程中的晶界迁移行为。结果表明:Fe-40Ni-Ti合金原始试样中存在两种析出,分别是凝固过程中形成的尺寸较大的Ti N颗粒及锻压过程中形成的应变诱导析出相,尺寸为10 nm左右。在1100℃等温30 min后,没有发现应变诱导析出相存在。直接观察结果则显示粗大的Ti N颗粒对晶界迁移有明显的阻碍作用,以类似于位错绕过析出颗粒的Orowan机制绕过Ti N颗粒,其主要原因可能是高温时晶界自由能明显各向同性,只有直接面对析出相的局部晶界受到析出相的阻碍,能够发生大曲率弯曲,晶界表现出较强的"柔性",此时析出粒子必然无法对其运动产生强烈的阻碍作用。

关键词(KeyWords)： Fe-40Ni-Ti合金;晶界迁移;TiN析出

Abstract:

Keywords:

基金项目(Foundation): 河北省杰出青年科学基金(E2012105005)

作者(Author): 苑少强,郁春锋,杨跃辉,郝斌

DOI: 10.13289/j.issn.1009-6264.2015.11.005

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