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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(英文),2021,50(8):2921~2926.[Xu Feng,Yang Li,Deng Changchun,Xiao Ying,Xu hu and 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.]
Effect of solution temperature on transformation of δ-ferrite in austenitic stainless steel
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Received:September 02, 2020  
DOI:
Key words: Austenitic stainless  solution  precipitates  microstructure
Foundation item:江苏省高等学校自然科学研究重大项目(项目号18KJA460001)
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Xu Feng,Yang Li,Deng Changchun,Xiao Ying,Xu hu and Zhang Yaocheng  
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Abstract:
      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%.