金属热处理 ›› 2021, Vol. 46 ›› Issue (7): 56-59.DOI: 10.13251/j.issn.0254-6051.2021.07.011

• 组织与性能 • 上一篇    下一篇

310S耐热不锈钢高温长期时效过程中的组织演变

苗华军, 李国平   

  1. 太原钢铁集团有限公司 先进不锈钢材料国家重点实验室, 山西 太原 030003
  • 收稿日期:2020-12-25 出版日期:2021-07-25 发布日期:2021-12-10
  • 作者简介:苗华军(1977—),男,高级工程师,硕士,主要研究方向为不锈钢材料的研发及科技管理,E-mail:miaohj@tisco.com.cn。

Microstructure evolution of 310S heat-resistant stainless steel during long term aging at high temperature

Miao Huajun, Li Guoping   

  1. State Key Laboratory of Advanced Stainless Steel Materials, Taiyuan Iron & SteelGroup Co., Ltd., Taiyuan Shanxi 030003, China
  • Received:2020-12-25 Online:2021-07-25 Published:2021-12-10

摘要: 采用光学显微镜、扫描电镜及X射线能谱、显微硬度计和X射线衍射仪研究了310S耐热不锈钢在950 ℃下50~3000 h长时间时效后的显微组织。结果表明,时效后主要析出了碳化物Cr23C6和σ相两种析出相,时效过程中碳化物Cr23C6先于σ相析出;随时效时间的延长,碳化物数量先增加然后减少,σ相含量一直在增加。

关键词: 耐热不锈钢, 时效, 析出相

Abstract: Microstructure evolution of the 310S heat-resistant stainless steel after aging at 950 ℃ for 50-3000 h was investigated by optical microscope (OM), scanning electron microscope (SEM) and energy dispersive X-ray spectrometer(EDS),microhardness tester as well as X-ray diffraction instrument (XRD).The experimental results indicate that the major precipitates are Cr23C6 and σ phase after aging. When the aging time is 50 h, the carbide Cr23C6 precipitates before the σ phase. During aging, the number of Cr23C6 increases at first and then decreases, while the content of σ phase increases all the time.

Key words: heat-resistant stainless steel, aging treatment, precipitated phase

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