Effect of N Content on Precipitation Behavior of Secondary Austenite in S32750 Duplex Stainless Steel

Wu Xiaohan; Song Zhigang; He Jianguo; Feng Han; Zheng Wenjie; Zhu Yuliang

doi:10.20057/j.1003-8620.2023-00090

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Effect of N Content on Precipitation Behavior of Secondary Austenite in S32750 Duplex Stainless Steel

Product Research and Development | 更新时间：2025-05-09

- Effect of N Content on Precipitation Behavior of Secondary Austenite in S32750 Duplex Stainless Steel
- Special Steel Vol. 45, Issue 1, Pages: 18-22(2024)
- 作者机构：
  
  钢铁研究总院有限公司特殊钢研究院，北京 100081
- 作者简介：
- 基金信息：
- DOI：10.20057/j.1003-8620.2023-00090
  CLC： TG142.71
- Received：25 May 2023，
  
  Published：30 January 2024
- 稿件说明：
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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.

摘要

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

［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。

Abstract

With the improvement of the quality and performance requirements of duplex stainless steel （DSS） in the industry， secondary austenite （γ

） 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

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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references

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