金属热处理 ›› 2021, Vol. 46 ›› Issue (9): 36-41.DOI: 10.13251/j.issn.0254-6051.2021.09.006

• 材料研究 • 上一篇    下一篇

氮及热处理制度对028合金微观组织的影响

巩芳源1,2, 冯翰秋2, 郎宇平2, 陈海涛2, 王曼3, 朱雄明4, 冷崇燕1   

  1. 1.昆明理工大学 材料科学与工程学院, 云南 昆明 650093;
    2.钢铁研究总院 特殊钢研究所, 北京 100081;
    3.浙江久立特材科技股份有限公司, 浙江 湖州 313028;
    4.湖州久立永兴特种合金材料有限公司, 浙江 湖州 313005
  • 收稿日期:2021-04-04 出版日期:2021-09-25 发布日期:2021-12-09
  • 通讯作者: 冯翰秋,工程师,硕士,E-mail:fenghanqiu@nercast.com
  • 作者简介:巩芳源(1994—),女,硕士研究生,主要研究方向为铁镍基合金,E-mail:1575685619@qq.com。
  • 基金资助:
    国家重点研发计划(2016YFB0300202)

Effect of nitrogen and heat treatment on microstructure of 028 alloy

Gong Fangyuan1,2, Feng Hanqiu2, Lang Yuping2, Chen Haitao2, Wang Man3, Zhu Xiongming4, Leng Chongyan1   

  1. 1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming Yunnan 650093, China;
    2. Special Steels Research Institute, Central Iron and Steel Research Institute, Beijing 100081, China;
    3. Zhejiang Jiuli Special Material Technology Co., Ltd., Huzhou Zhejiang 313028, China;
    4. Huzhou Jiuli Yongxing Special Alloy Material Co., Ltd., Huzhou Zhejiang 313005, China
  • Received:2021-04-04 Online:2021-09-25 Published:2021-12-09

摘要: 借助Thermo-Calc热力学计算软件,分析了028合金主要元素对氮饱和溶解度和平衡相析出温度的影响,设计了不同氮含量的试验合金。采用光学显微镜、扫描电镜等方法研究了不同固溶温度下试验合金的微观组织。结果表明,Cr、Mo和Mn提高氮的饱和溶解度,Ni、Cu降低氮的饱和溶解度;Ni显著降低σ相析出温度,Cr、Mo显著提高σ相析出温度。随着固溶温度的升高,晶粒的等轴性提高,在1080 ℃固溶时,试验合金充分固溶获得再结晶完全的等轴晶。当固溶温度超过1110 ℃时,试验合金回复再结晶完全,晶粒迅速长大;固溶温度相同条件下,氮含量越高,试验合金的平均晶粒尺寸越小,说明氮可以起到细化晶粒的作用。

关键词: 热力学计算, 028合金, 氮含量, 组织, 固溶处理

Abstract: Influence of main elements of 028 alloy on saturated solubility of nitrogen and precipitation temperature of equilibrium phase was analyzed by using Thermo-Calc software, and the tested alloys with different nitrogen contents were designed. The microstructure of the tested alloys was observed and studied by means of optical microscope and SEM. The results show that Cr, Mo and Mn promote the saturated solubility of nitrogen, Ni and Cu reduce the saturated solubility of nitrogen, Ni reduces the precipitation temperature of σ phase remarkably, but Cr and Mo increase the precipitation temperature of σ phase remarkably. The equiaxial properties of grains become better with the increase of solution temperature, and fully recrystallized equiaxial crystals are obtained at 1080 ℃. When the solution treatment temperature exceed 1110 ℃, the recovery and recrystallization of the tested alloys are complete and the grain grow rapidly. At the same solution treatment temperature, the higher the nitrogen content is, the smaller the grain of the tested alloy is, which indicates that N plays a role in grain refining.

Key words: thermodynamic calculation, 028 alloy, nitrogen content, microstructure, solution treatment

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