时效工艺对2205双相不锈钢σ相析出行为的影响

doi:10.13251/j.issn.0254-6051.2020.10.001

金属热处理 ›› 2020, Vol. 45 ›› Issue (10): 1-5.DOI: 10.13251/j.issn.0254-6051.2020.10.001

• 工艺研究 • 下一篇

时效工艺对2205双相不锈钢σ相析出行为的影响

高晓丹^1,2, 任学平¹, 李晶琨¹, 闫强¹, 袁傲明¹

1.北京科技大学材料科学与工程学院, 北京 100083;
2.北京科技大学新材料技术研究院, 北京 100083

收稿日期:2020-04-16 出版日期:2020-10-25 发布日期:2020-12-29
通讯作者: 任学平,教授,博士,E-mail: rxp33@ustb.edu.cn
作者简介:高晓丹(1983—),女,讲师,博士研究生,主要研究方向为双相不锈钢组织演变与超塑性,E-mail: tjjk_ry@126.com。

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

Gao Xiaodan^1,2, Ren Xueping¹, Li Jingkun¹, Yan Qiang¹, Yuan Aoming¹

1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China

Received:2020-04-16 Online:2020-10-25 Published:2020-12-29

摘要/Abstract

摘要： 通过光学显微镜、扫描电镜对2205双相不锈钢1050、1350 ℃固溶30 min+650~1000 ℃时效0.5~1440 min后σ相形貌和含量进行观测。结果表明:经过1050 ℃固溶处理后,2205双相不锈钢在650~850 ℃时效处理过程中存在σ相析出行为。当时效温度为850 ℃时,σ相析出最快;随着时效温度偏离850 ℃,σ相析出速度降低。经过1350 ℃固溶后,σ相析出温度整体提高,析出温度范围更宽。σ相析出后即发生迅速长大,在3 h内体积分数可达0.25%~1.75%;之后其生长速率逐渐减缓。σ相首先在铁素体与奥氏体相界处以小于1 μm的近似球状颗粒形貌析出,之后沿着铁素体相中宽度在几微米的狭窄区域向铁素体内生长。2205双相不锈钢的时效处理温度影响σ相的析出行为,时效处理应在偏离850 ℃的温度下进行,以防止σ相的析出和快速长大。

关键词: 2205双相不锈钢, 时效工艺, σ相, 析出

Abstract: 2205 duplex stainless steel was solid-solution treated at 1050 ℃ and 1350 ℃ for 30 min, and then aged at 650-1000 ℃ for 0.5-1440 min. The microstructure and σ phase were characterized by optical microscope (OM) and scanning electron microscope (SEM). The results show that the precipitation of σ phase in the 2205 duplex stainless steel after solid solution treatment at 1050 ℃ occurs during aging treatment at 650-850 ℃. At 850 ℃, the precipitation of σ phase is the fastest, and the precipitation rate decreases when the aging temperature deviates from 850 ℃. After solid solution treatment at 1350 ℃, the precipitation temperature of σ phase rises in overall, and its range is wider. The σ phase coarsens quickly after precipitation and the volume fraction reaches 0.25%-0.75% within 3 h, then the growth rate of σ phase decreases with the increase of aging time. The σ phase precipitates at the phase boundary between ferrite and austenite with the morphology of quasi-spherical particles less than 1 μm, then it grows in the narrow region of several microns along the width of ferrite phase. The aging temperature affects the precipitation behavior of 2205 duplex stainless steel, and the aging temperature should be away from 850 ℃ to avoid the precipitation and growth of σ phase.

Key words: 2205 duplex stainless steel, aging process, σ phase, precipitation

中图分类号:

TG142.71

高晓丹, 任学平, 李晶琨, 闫强, 袁傲明. 时效工艺对2205双相不锈钢σ相析出行为的影响[J]. 金属热处理, 2020, 45(10): 1-5.

Gao Xiaodan, Ren Xueping, Li Jingkun, Yan Qiang, Yuan Aoming. Effect of aging process on σ phase precipitation of 2205 duplex stainless steel[J]. Heat Treatment of Metals, 2020, 45(10): 1-5.

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时效工艺对2205双相不锈钢σ相析出行为的影响

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

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