Acta Metallurgica Sinica (English Letters) ›› 2011, Vol. 24 ›› Issue (3): 243-248.DOI: 10.11890/1006-7191-113-243

• 研究论文 • 上一篇    下一篇

Effect of Solution Treatment on Microstructures and Me-chanical Properties of AISI 321 Service

Yanhui Zhao1,Haitao MA2   

  1. 1. 大连理工大学材料学院
    2. 大连理工大学
  • 收稿日期:2011-02-17 修回日期:2011-02-23 出版日期:2011-06-25 发布日期:2011-06-13
  • 通讯作者: Haitao MA

Effect of solution treatment on microstructures and mechanical properties of AISI 321 service

Yanhui ZHAO1, Haitao MA1, Lai WANG1, Changhai SUN1, Chao GUO2
   

  1. 1. School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024,China
    2. West Pacific Petrochemical Company Ltd.,Dalian 116600, China
  • Received:2011-02-17 Revised:2011-02-23 Online:2011-06-25 Published:2011-06-13
  • Contact: Haitao MA

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摘要： A detailed knowledge of changes in microstructures and mechanical properties that occur in AISI 321 stainless steels service before and after solution treatment is of great interest, since the ductility and toughness of AISI 321 stainless steels may change drastically after service for a long time. After solution treatment at 1050 °C, the microstructures of AISI 321 stainless steels service for 80000 hours at 700 °C indicate that the content of sigma phase significantly decreased, the grains of austenite grew and the amount of twins together with the size increased vs. solution treatment time. The results of mechanical properties tests show that the impact toughness at room temperature was superior at solution treatment, and there was no obvious change in the impact toughness between different times of solution treatment at room temperature.

Abstract: A detailed knowledge of changes in microstructures and mechanical properties that occur in AISI 321 stainless steels service before and after solution treatment is of great interest, since the ductility and toughness of AISI 321 stainless steels may change drastically after service for a long time. After solution treatment at 1050 ℃, the microstructures of AISI 321 stainless steels service for 80 000 h at 700℃ indicate that the content of sigma phase significantly decreased, the grains of austenite grew and the amount of twins together with the size increased with solution treatment time. The results of mechanical properties tests show that the impact toughness at room temperature was superior at solution treatment, and there was no obvious change in the impact toughness between different times of solution treatment at room temperature.

Key words: Austenitic stainless steels, Microstructure, Mechanical properties, Solution treatment, Sigma phase