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利用等离子堆焊技术在PH17-4马氏体沉淀硬化不锈钢表面堆焊Stellite12钴基合金熔覆层,并在堆焊后对其进行热处理。采用光学显微镜(OM)、扫描电镜(SEM)、电子探针(EPMA)、维氏显微硬度计等测试手段,研究了固溶及固溶后时效处理对堆焊层、母材热影响区组织结构及显微硬度的影响。结果表明:焊缝金属与母材间界面熔合良好,堆焊层组织均匀,在母材中靠近熔合线处出现了宽度为2 mm左右的热影响区;焊后进行1 050℃的固溶处理,母材热影响区消失,组织均匀化,堆焊层组织细化,同时显微硬度提高;固溶后分别进行480℃,540℃及620℃的时效处理,母材中有硬质相析出,显微硬度增加,且随着时效温度升高显微硬度降低。
The cladding layer of Stellite12 Co-based alloy was deposited on the surface of PH17-4 martensitic precipitation-hardened stainless steel by plasma surfacing and heat-treated after welding. The effects of solution treatment and solution treatment on the heat-affected zone of overlay and base metal were studied by optical microscope (OM), scanning electron microscope (SEM), electron probe (EPMA) and Vickers microhardness tester Effect of Microstructure and Microhardness. The results show that the interface between the weld metal and the base metal is well welded and the surfacing layer is homogenous. The HAZ with a width of about 2 mm appears near the weld line in the base metal. After soldering, the solution treatment at 1 050 ℃ , The heat-affected zone of the base material disappeared, the homogenization of the structure and the microstructure of the surfacing layer were refined, and the microhardness was improved. After the solution treatment, aging treatment was performed at 480 ℃, 540 ℃ and 620 ℃, respectively. , The microhardness increases, and the microhardness decreases as the aging temperature increases.