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对17-4PH不锈钢进行1 040℃加热1 h水冷的固溶处理，随后于580℃回火4 h使富Cu相析出和在400℃进行长期时效处理。利用显微硬度计、原子探针层析技术(atom probe tomography, APT)及高分辨率透射电子显微镜(high resolution transmission electron microscope, HRTEM)研究了富Cu相对17-4PH不锈钢时效过程中G相析出的影响及其硬度随G相微观结构的变化。结果表明：回火后时效的试样硬度低于直接时效的试样，预回火生成的粗大富Cu相周围富集了Ni、Mn元素，在随后的时效过程中，Si元素在Ni、Mn富集区偏聚，加速了Ni-Mn-Si团簇向G相的转变。
Abstract：17-4PH stainless steel was solution treated by heating at 1 040 ℃ for 1 h followed by water cooling, then tempered at 580 ℃ for 4 h to precipitate the copper-rich phase and long-term aged at 400 ℃. The influence of copper-rich phase on the precipitation of G-phase in 17-4PH stainless steel during the aging and the change of its hardness with the microstructure of G-phase were studied by microhardness tester, atom probe tomography(APT), and high-resolution transmission electron microscope(HRTEM). The results showed that(a) the hardness of the tempered and aged samples was lower than that of the directly aged samples;(b) Ni and Mn elements were enriched around the coarse Cu-rich phase generated during pre-tempering, and in the process of the subsequent aging, Si elements segregated in the nickel-and manganese-enriched regions, thus accelerating the transformation of Ni-Mn-Si clusters into the G-phase.
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基本信息:
DOI：10.19947/j.issn.1001-7208.2024.04.15
中图分类号:TG142.71;TG156.92
引用信息:
[1]张春风,王泽民,刘文庆.富铜相对17-4PH不锈钢400℃时效过程中G相析出的影响[J].上海金属,2025,47(04):20-25.DOI:10.19947/j.issn.1001-7208.2024.04.15.
基金信息: