许峰,杨莉,邓长春,肖颖,徐虎,张尧成.固溶温度对奥氏体不锈钢δ铁素体转变的影响[J].稀有金属材料与工程,2021,50(8):2921~2926.[Xu Feng,Yang Li,Deng Changchun,Xiao Ying,Xu hu,Zhang Yaocheng.Effect of solution temperature on transformation of δ-ferrite in austenitic stainless steel[J].Rare Metal Materials and Engineering,2021,50(8):2921~2926.]
固溶温度对奥氏体不锈钢δ铁素体转变的影响
投稿时间:2020-09-02  修订日期:2020-09-28
中文关键词:  奥氏体不锈钢  固溶  析出相  微结构
基金项目:江苏省高等学校自然科学研究重大项目(项目号18KJA460001)
中文摘要:
      本文对含有残余铁素体的奥氏体不锈钢进行不同温度的固溶处理,使用SEM、EBSD、TEM和显微硬度等技术分析试验样品的微观组织、织构和析出相。结果表明:奥氏体不锈钢在900~1100℃固溶处理30min后水淬,存在奥氏体、铁素体和Sigma三相,未发现M23C6和Chi相。在900~1000℃范围内生成Sigma相,Sigma相会提高基体硬度。Sigma相主要由残余δ铁素体分解生成, {001}<110>和{001}<100>取向的δ铁素体优先向Sigma相转变。且随着温度的升高,Sigma含量降低,奥氏体平均晶粒尺寸增加,硬度呈逐渐下降趋势。固溶温度超过1050℃后,Sigma相完全固溶进奥氏体中,奥氏体平均晶粒尺寸显著长大,硬度值快速降低,残余铁素体中{001}<110>和{001}<100>织构重新增强。1100℃固溶处理后,残余铁素体含量降低至0.2%。
Effect of solution temperature on transformation of δ-ferrite in austenitic stainless steel
英文关键词:Austenitic stainless  solution  precipitates  microstructure
英文摘要:
      The austenitic stainless steel samples containing residual δ ferrite were solution treated at different temperatures. The SEM, EBSD, TEM and hardness tester were applied to investigate the microstructure, texture, hardness and precipitate phase characterization of the experimental samples. The results show that there are three phases of austenite, ferrite and sigma in austenitic stainless steel after solution treatment at 900~1100℃ for 30min. M23C6 and Chi phase are not found. The sigma phase forms in the range of 900~1000℃, which also enhances the hardness of the matrix. Sigma phase is mainly formed by decomposition of residual δ ferrite. The {001}<110> and {001}<100> oriented δ ferrite preferentially transforms to sigma phase. With the increase of temperature, the content of sigma decreases, the average grain size of austenite increases, and the hardness decreases gradually. After 1050℃, sigma phase is completely dissolved into austenite, and the average grain size of austenite grows significantly. This results into the hardness decreases rapidly. Meanwhile,{001}<110> and {001}<100> textures of δ ferrite were re-enhanced。After solution treatment at 1100℃, the content of residual δ ferrite decreased to 0.2%.
作者单位E-mail
许峰 常熟理工学院 xufeng388@163.com 
杨莉 桂林航天工业学院  
邓长春 常熟理工学院  
肖颖 常熟理工学院  
徐虎 常熟理工学院  
张尧成 常熟理工学院  
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