钢铁研究总院有限公司特殊钢研究院,北京 100081
吴晓涵(1994―),女,博士,工程师;E-mail:wuxiaohan@nercast.com
宋志刚(1970―),男,教授,博士生导师;E-mail:zhigangsongnercast@163.com
收稿:2023-05-25,
纸质出版:2024-01-30
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吴晓涵,宋志刚,何建国等.N含量对S32750双相不锈钢中二次奥氏体析出行为的影响[J].特殊钢,2024,45(01):18-22.
Wu Xiaohan,Song Zhigang,He Jianguo,et al.Effect of N Content on Precipitation Behavior of Secondary Austenite in S32750 Duplex Stainless Steel[J].Special Steel,2024,45(01):18-22.
吴晓涵,宋志刚,何建国等.N含量对S32750双相不锈钢中二次奥氏体析出行为的影响[J].特殊钢,2024,45(01):18-22. DOI: 10.20057/j.1003-8620.2023-00090.
Wu Xiaohan,Song Zhigang,He Jianguo,et al.Effect of N Content on Precipitation Behavior of Secondary Austenite in S32750 Duplex Stainless Steel[J].Special Steel,2024,45(01):18-22. DOI: 10.20057/j.1003-8620.2023-00090.
随着行业对双相不锈钢品质及性能要求的提升,二次奥氏体已经成为影响S32750双相不锈钢应用的关键因素之一。二次奥氏体是“温度-冷却速率”共同作用的一种亚稳态产物,与铁素体相呈近K-S或N-W位向关系,且对N有富集作用,可按形貌将其分为针状二次奥氏体和孤岛状二次奥氏体。研究了N含量对二次奥氏体析出行为的影响。通过制备
w
[N]为0.02%、0.09%和0.17%的试验钢,并借助热模拟及EBSD检测可知,随着N含量增加,二次奥氏体由弯曲羽毛状向板条形针状转变,且奥氏体相的整体比例增加。经计算可知,奥氏体相的析出方式与本征吉布斯自由能相关,即受到成分与试验温度的影响。
With the improvement of the quality and performance requirements of duplex stainless steel (DSS) in the industry, secondary austenite (γ
2
) has become one of the key factors affecting the application of S32750 DSS. Secondary austenite is considered as the joint product of temperature and cooling rates, which performed near K-S or N-W orientation relationship with the ferrite phase and an enrichment for N elements .Secondary austenite can be divided into needle-shaped austenite (NA) and isolated austenite (IA) by morphology. In this paper, the effect of N mass fraction on the precipitation behavior of secondary austenite was studied by preparing test steels with N content of 0.02%, 0.09% and 0.17%. Thermal-Calc simulation and EBSD detection proved that with the increase of N, γ
2
evolved from curved feather-shape to needled-shape with the total proportion of austenite phase increased. The precipitation mode of austenite related to the Gibbs free energy, which was namely affected by elements composition and temperature.
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吴晓涵 . S32750双相不锈钢高温转变二次奥氏体的演变及其对性能的影响 [D]. 北京 : 北京科技大学 , 2023 .
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