热处理对激光沉积修复GH4169合金的硬度与断口形貌的影响

发布时间：2018-02-03 17:14

本文关键词： 激光沉积修复 GH合金热处理显微硬度拉伸断口　出处：《材料热处理学报》2017年02期 　论文类型：期刊论文

【摘要】：研究了不同热处理方式下激光沉积修复GH4169合金试样的显微硬度分布变化特点以及拉伸断口形貌特征与变化情况。结果表明:沉积态试样修复区内的硬度平均值为297 HV0.1,热影响区的硬度值为260 HV0.1,均明显低于硬度值为460 HV0.1的基体。热处理后,修复区与热影响区硬度均明显提高,接近于基体硬度。相比于沉积态试样,局部热处理试样平均硬度增加了159 HV0.1,增加53.5%;真空热处理试样平均硬度增加了168 HV0.1,增加56.6%,略高于局部热处理。沉积态与热处理试样拉伸断口均为典型的韧性穿晶断裂,两种热处理方式下拉伸断口的韧窝尺寸变化不大。试验表明局部热处理和真空热处理都可达到提高拉伸性能的目的。
[Abstract]:The microhardness distribution and tensile fracture morphology of GH4169 alloy samples repaired by laser deposition under different heat treatment conditions were studied. The results showed that: 1. The average hardness of the deposited specimen is 297 HV0.1. The hardness of the heat-affected zone is 260HV0.1, which is obviously lower than that of the substrate with the hardness value of 460Hv. After heat treatment, the hardness of the repair zone and the heat-affected zone increase obviously. Compared with the deposited samples, the average hardness of local heat treated samples increased by 159 HV0.1 and 53.5% respectively. The average hardness of vacuum heat-treated samples increased by 168HV0.1 and 56.6, which was slightly higher than that of local heat treatment. The tensile fracture of both deposited and heat-treated specimens was typical ductile transgranular fracture. The dimple size of the tensile fracture surface changed little under two heat treatment conditions. The experimental results show that both local heat treatment and vacuum heat treatment can improve the tensile properties.
【作者单位】：沈阳航空航天大学航空制造工艺数字化国防重点学科实验室;沈阳黎明航空发动机(集团)有限责任公司焊接研究所;
【基金】：国家自然科学基金(51375316) 航空科学基金(2014ZE54028) 辽宁省高等学校科学研究项目(L2014054)
【分类号】：TG156;TG132.3
【正文快照】： 激光沉积修复技术因具有热影响区小、工艺重复性好及近净成形修复等优点,特别适合于GH4169合金等大型薄壁复杂结构零部件的三维成形修复[1]。由于激光沉积修复属于快速熔凝,GH4169合金的强化相γ″和γ'来不及析出,且枝晶间析出了高脆性Laves相,导致材料强度、塑性等性能下降,

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