东北大学学报:自然科学版 ›› 2016, Vol. 37 ›› Issue (9): 1317-1321.DOI: 10.12068/j.issn.1005-3026.2016.09.021

• 材料与冶金 • 上一篇    下一篇

时效处理对2205 DSS组织及力学性能的影响

吴天海1, 刘春明1, 姜周华1, 范光伟2   

  1. (1. 东北大学 材料科学与工程学院, 辽宁 沈阳110819; 2. 山西太钢不锈钢股份有限公司, 山西 太原030003)
  • 收稿日期:2015-06-08 修回日期:2015-06-08 出版日期:2016-09-15 发布日期:2016-09-18
  • 通讯作者: 吴天海
  • 作者简介:吴天海(1988-),男,安徽宣城人,东北大学博士研究生; 刘春明(1961-),男,陕西渭南人,东北大学教授,博士生导师; 姜周华(1963-),男,浙江萧山人,东北大学教授,博士生导师.
  • 基金资助:
    国家科技支撑计划项目(2012BAE04B01); 2011计划钢铁共性技术协同创新资助项目; 中央高校基本科研业务费专项资金资助项目(N140206001).

Influence of Ageing Treatment on Microstructures and Mechanical Properties of 2205 Duplex Stainless Steel

WU Tian-hai1, LIU Chun-ming1, JIANG Zhou-hua1, FAN Guang-wei2   

  1. 1. School of Materials Science & Engineering, Northeastern University, Shenyang 110819, China; 2. Shanxi Taigang Stainless Steel Co., Ltd., Taiyuan 030003, China.
  • Received:2015-06-08 Revised:2015-06-08 Online:2016-09-15 Published:2016-09-18
  • Contact: LIU Chun-ming
  • About author:-
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摘要: 首先对2205 DSS进行了1100℃固溶处理,随后将试样分别在650,700,750,800,850和900℃下进行不同时间的时效处理,探究2205 DSS中σ相的析出规律及其对材料组织和力学性能的影响.研究结果表明:2205 DSS中σ相的析出分为有碳化物伴随和无碳化物伴随两种方式,前者发生在α-γ相界上,后者则主要发生在α相的晶内和晶界;2205 DSS在850℃时效时σ相的析出行为最严重;在析出σ相后,合金元素Cr和Mo在各相中会发生不同程度的偏聚;2205 DSS中析出少量的σ相对材料的塑性影响不大,但会显著降低材料的冲击韧性,而σ相的大量析出则会使两者均发生严重恶化;σ相的析出对材料的屈服强度影响不大,对材料的抗拉强度有略微的提高作用.

关键词: 2205双相不锈钢, 时效, σ相, 显微组织, 力学性能

Abstract: 2205 DSS(duplex stainless steel)were solution treated at 1100℃ followed by aging at 650~900℃ for different time to study the precipitation of σ phase and its influence on microstructures and properties. The results showed that σ phase precipitates in two different ways, one is the precipitation at phase boundaries accompanied by carbides; the other is the precipitation in the ferrite grains or at the ferrite grain boundaries without accompanied carbides. The precipitation of σ phase is the most serious when aged at 850℃. After the precipitation, the segregation of alloying elements Cr and Mo in different phases occurs in different degrees. Small amounts of σ phase have little effect on ductility, but reduce impact toughness significantly. Large amounts of σ phase can reduce both ductility and impact toughness severely. The precipitation of σ phase has little effect on yield strength, and can improve tensile strength slightly.

Key words: 2205 DSS(duplex stainless steel), ageing, σ phase, microstructure, mechanical property

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