东北大学学报:自然科学版 ›› 2014, Vol. 35 ›› Issue (4): 504-507.DOI: 10.12068/j.issn.1005-3026.2014.04.011

• 材料与冶金 • 上一篇    下一篇

2205双相不锈钢中σ相的析出行为

马明1,丁桦1,唐正友1,李国平2   

  1. (1 东北大学 材料与冶金学院, 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:2013-07-21 修回日期:2013-07-21 出版日期:2014-04-15 发布日期:2013-11-22
  • 通讯作者: 马明
  • 作者简介:马明(1986-),男,辽宁本溪人,东北大学博士研究生;丁桦(1958-),女,安徽合肥人,东北大学教授,博士生导师.
  • 基金资助:
    国家自然科学基金重点资助项目(51031001).

Precipitation Behavior of σ Phase in Duplex Stainless Steel 2205

MA Ming1, DING Hua1, TANG Zhengyou1, LI Guoping2   

  1. 1. School of Material & Metallurgy, Northeastern University, Shenyang 110819, China; 2. Shanxi Taiyuan Stainless Steel Co., Ltd., Taiyuan 030003, China.
  • Received:2013-07-21 Revised:2013-07-21 Online:2014-04-15 Published:2013-11-22
  • Contact: MA Ming
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摘要: 对固溶处理后的双相不锈钢2205进行了不同温度下(750~950℃)的等温时效处理,利用OM观测不同时效条件下析出相的形貌特征,重点观测了800℃下σ相的析出过程,并通过EDS,XRD,TEM和电子探针等检测手段对800℃,240min时效处理后试样的内部组织进行了研究,揭示了σ相的析出特征及机理.结果表明:σ相是一种Fe-Cr-Mo金属间化合物,属于四方结构;时效过程中,σ相通过δ铁素体→γ2+σ反应生成,合金元素Mo的扩散是其形成的主要影响因素;保温240min后,时效温度为800℃时σ相析出量最大,相同时间条件下时效温度为950℃时,σ相析出量明显降低.

关键词: 双相不锈钢, σ相, 等温时效, 微观组织, 电子探针

Abstract: The effects of aging conditions on the morphology features of precipitates of DSS (duplex stainless steel) 2205 after solution treatment were observed by OM, and the precipitation process of σ phase at 800℃ were analyzed. In order to investigate the precipitation characteristics and the mechanisms of σ phase, the microstructure of the sample by aging treatment at 800℃ for 240min was studied by EDS, XRD, TEM and EP. The results showed that σ phase which precipitates by the reaction δ→γ2+σ is an FeCrMo intermetallic compound and the crystal structure is tetragonal, and the diffusion of alloying elements Mo mainly affected its formation. After the same aging time, σ phase precipitates severely at 800℃ and slightly at 950℃.

Key words: duplex stainless steel, σ phase, isothermal ageing, microstructure, electron probe

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