张健,缪春辉,秦小龙,王若民,陈国宏,汤文明

• 1:安徽新力电业科技咨询有限责任公司
• 2:国网安徽省电力有限公司电力科学研究院
• 3:合肥工业大学材料科学与工程学院

摘要(Abstract)：

在氨气气氛下对C422 (22Cr12NiMoWV)钢进行两段式气体渗氮，并研究了渗氮层的显微组织结构以及渗氮后C422钢的室温及高温力学性能，评价渗氮对该钢缺口敏感性的影响。结果表明：C422钢的渗氮层具有三层结构：表层为主要由Fe_3N、Fe_4N和CrN构成的化合物层，中间层为致密的α-Fe(N)扩散层，内层为α-Fe(N)相扩散进入钢基体而形成的过渡层。与未渗氮试样相比，随着渗氮时间延长，有无缺口C422钢渗氮试样的室温、高温拉伸强度和伸长率单调下降，屈服强度先增大后减小。渗氮层的断裂模式为解理断裂的脆性断裂。气体渗氮导致C422钢的室温缺口敏感性增大，但对其高温缺口敏感性影响不大。

关键词(KeyWords)： C422钢;两段式气体渗氮;渗氮层;解理断裂;缺口敏感性

Abstract:

Keywords:

基金项目(Foundation): 安徽新力电业科技咨询有限责任公司科研项目(2016咨-CL-02)

作者(Author): 张健,缪春辉,秦小龙,王若民,陈国宏,汤文明

DOI: 10.13289/j.issn.1009-6264.2021-0643

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