陆文杰,华小珍,黄晋华,周贤良,彭新元

• 1:南昌航空大学材料科学与工程学院

摘要(Abstract)：

对高Nb含量的316LN奥氏体不锈钢,在650、750和800℃时效处理不同时间。通过定量金相,SEM、XRD及TEM等分析技术,分析了析出相随时效时间和温度的变化关系。结果表明:时效初期,析出相沿晶界呈颗粒状、短棒状析出,随时效时间延长析出相沿晶界呈链状析出,析出量不断增多,并逐渐向晶内生长,最终以不连续的片状布满整个晶面。750℃为时效敏感温度,该时效温度下,析出相的量最多,孕育时间最短。整个时效阶段,时效优先析出相为Z-Cr Nb N相,且作为氮化物的主要存在形式,而不是常见的ε-Cr2N相。316LN不锈钢中,Nb元素的添加,一定程度上抑制了ε-Cr2N相和Z-Cr23C6相的析出,加速了σ-FeCrMo相的析出。

关键词(KeyWords)： 316LN不锈钢;时效处理;析出相;Z-CrNbN

Abstract:

Keywords:

基金项目(Foundation): 国家高技术研究开发项目(863计划,2012AA03A507);; 南昌航空大学创新专向资金(YC2015002);; 江西省教育厅科技项目(GJJ14534);; 江西省金属材料微结构调控重点实验室开放基金(JW201223001)

作者(Author): 陆文杰,华小珍,黄晋华,周贤良,彭新元

DOI: 10.13289/j.issn.1009-6264.2016.08.017

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