金属热处理 ›› 2021, Vol. 46 ›› Issue (10): 26-30.DOI: 10.13251/j.issn.0254-6051.2021.10.004

• 材料研究 • 上一篇    下一篇

冷轧与时效工艺对2205双相不锈钢σ相析出的影响

袁傲明1, 李晶琨2, 高晓丹2, 任学平2   

  1. 1.北京机科国创轻量化科学研究院有限公司, 北京 100083;
    2.北京科技大学 材料科学与工程学院, 北京 100083
  • 收稿日期:2021-03-30 出版日期:2021-10-25 发布日期:2021-12-08
  • 通讯作者: 任学平,教授,博士,E-mail:rxp33@ustb.edu.cn
  • 作者简介:袁傲明(1993—),男,助理工程师,硕士,主要研究方向为钛合金、铝合金及双相不锈钢组织演变与超塑性,E-mail:yam18810373753@163.com
  • 基金资助:
    “高档数控机床与基础制造装备”科技重大专项(2018ZX04044001)

Effect of cold rolling and aging process on σ phase precipitation of 2205 duplex stainless steel

Yuan Aoming1, Li Jingkun2, Gao Xiaodan2, Ren Xueping2   

  1. 1. Beijing National Innovation Institute of Lightweight Ltd., Beijing 100083, China;
    2. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
  • Received:2021-03-30 Online:2021-10-25 Published:2021-12-08

摘要: 对1050 ℃固溶处理后的2205双相不锈钢在650~1000 ℃下时效处理,利用金相显微镜(OM)和扫描电镜(SEM)观测不同工艺条件下σ相析出规律,绘制了σ相析出TTP曲线图,描述了σ相析出特征。结果表明:时效初期,σ相优先在铁素体与奥氏体相界处形核,随着时效温度的升高和时效时间的增加,σ相不断长大、粗化并向铁素体基体内延伸;时效时间越长,析出相越多,时效时间相同时,当温度达到850 ℃,析出量达到最大值,之后随着温度的升高而降低。σ相析出温度范围为650~950 ℃,析出鼻尖温度为850 ℃,轧制变形量增加,σ相析出速度加快,但并不影响其析出的鼻尖温度。

关键词: 2205双相不锈钢, 冷轧变形, 固溶时效, 组织演变, σ相析出

Abstract: The 2205 duplex stainless steel after solution treatment at 1050 ℃ was treated by aging at 650-1000 ℃. The σ phase precipitation rule under different process conditions was observed by means of OM and SEM. TTP curves of σ phase precipitation were obtained to characterize the precipitation of σ phase. The results show that in the early stage of aging, the σ phase preferentially nucleates at the phase boundary of the two phases of austenite and ferrite. With the increase of aging temperature and the aging time, the σ phase grows, coarsens and extends to the ferrite matrix. The longer the aging time, the more precipitation phases. When the aging time is the same and the temperature reaches 850 ℃, the amount of precipitation reaches the maximum and then decreases with the increase of temperature. The precipitation temperature range of σ phase is 650-950 ℃, and the knee temperature is about 850 ℃. The increase in rolling deformation speeds up the precipitation of σ phase, but it does not affect the knee temperature of the precipitation.

Key words: 2205 duplex stainless steel, cold rolling deformation, solid-solution and aging treatment, microstructure evolution, σ phase precipitation

中图分类号: