徐明阳,陆金玉,王威,田家龙

• 1:江西景航航空锻铸有限公司
• 2:中国科学院金属研究所
• 3:东北大学冶金学院

摘要(Abstract)：

采用光学显微镜(OM)、场发射扫描电镜(FESEM)、X-射线衍射仪(XRD)、洛氏硬度仪、拉伸试验机和冲击试验机等研究了热处理工艺对S53高强度不锈钢组织和力学性能的影响，并采用Thermo-Calc和FactSage等计算软件对实验钢进行了热、动力学计算。结果表明：随固溶温度的升高，实验钢晶粒长大的同时伴随着析出相的回溶，奥氏体相稳定性提升，残留奥氏体含量增加。在1080～1100℃固溶时析出相基本完全回溶，此时组织均匀性较好，实验钢达到了强韧性的良好匹配。实验钢经1100℃固溶处理1 h及双时效处理后的力学性能最佳，其抗拉强度达到2 GPa以上，伸长率接近11%,冲击吸收能量达到20 J以上，同时洛氏硬度达到了56 HRC。在固溶处理的温度范围内，随固溶温度的升高，各元素的扩散系数显著提高，析出相加速回溶；在时效处理的温度范围内，碳的扩散系数显著高于其余合金元素，相较于奥氏体相(FCC),各合金元素在铁素体相(BCC)中的扩散速度较高。

关键词(KeyWords)： 超高强度不锈钢;热处理工艺;力学性能;显微组织

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金面上项目(52271122);; 慈溪市共性技术攻关项目(2019gy02);; 中央高校基本科研业务专项资金(N2225009)

作者(Author): 徐明阳,陆金玉,王威,田家龙

DOI: 10.13289/j.issn.1009-6264.2022-0545

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