王冬,邹德宁,韩英,程宝

• 1:西安建筑科技大学冶金工程学院
• 2:长春工业大学材料科学与工程学院

摘要(Abstract)：

通过JMat Pro软件,计算预测254SMo超级奥氏体不锈钢(SASS)和2507超级双相不锈钢(SDSS)中σ相的热力学析出条件,并制定了不同的热处理制度;同时借助光学显微镜、扫描电镜等手段分析研究了经不同温度时效不同时间后σ析出相的形态及析出机理。结果表明:254SMo SASS在1020℃不同时效时间下,在晶界上析出富含Cr、Mo和低Ni的σ相。随着时效时间增加,σ相数量增多、尺寸增大,且呈短棒状、长条状和胞状等形态,并按照γ→σ方式析出;2507 SDSS在950℃不同时效时间下,在α/γ界面和α/α晶界处析出富含Cr、Mo和更低水平Ni的σ相。随着时效时间增加,σ相数量增多,向铁素体内部长大并最终呈网状分布在奥氏体基体上,且伴有二次奥氏体(γ_2)生成,其是按照α→σ+γ_2方式析出。

关键词(KeyWords)： 254SMo超级奥氏体不锈钢;2507超级双相不锈钢;σ相;热力学计算

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金-钢铁联合基金面上培育项目(U1460104);; 陕西省自然科学基础研究计划面上项目(2015JM5197);; 国家重点实验室开放基金(20151202)

作者(Author): 王冬,邹德宁,韩英,程宝

DOI: 10.13289/j.issn.1009-6264.2016.05.018

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