激光沉积修复GH4169合金热处理的组织及性能

发布时间：2019-04-30 19:06

【摘要】：激光沉积修复GH4169合金强度与塑性仅达到铸件标准Q/5B 453-1995,热处理是改善其力学性能的重要手段。研究了不同热处理工艺对激光沉积修复GH4169合金显微组织和拉伸性能的影响规律,结果表明:激光沉积修复GH4169合金试样经直接时效热处理后,与沉积态相比,枝晶间的Laves相少量熔解,拉伸强度提高,与锻件标准Q/3B 548-1996(高强)相当,而塑性略有下降;且随着时效时间的延长,试样拉伸强度与塑性没有提高。修复试样经固溶处理后,Laves相部分熔解,并在其周围析出大量针状δ相,拉伸强度达到锻件标准,断后伸长率比沉积态提高21%;修复试样经均匀化处理后,Laves相基本熔解,在晶界及晶内均析出了δ相,拉伸强度接近锻件标准,断后伸长率超过了锻件标准27.1%。试验表明合适的热处理能有效提高激光沉积修复GH4169合金的强度与塑性。
[Abstract]:The strength and plasticity of GH4169 alloy repaired by laser deposition only reach the standard QX5B 453 / 1995. Heat treatment is an important means to improve the mechanical properties of the alloy. The effects of different heat treatment processes on the microstructure and tensile properties of GH4169 alloy repaired by laser deposition were studied. The results showed that the microstructure and tensile properties of GH4169 alloy repaired by laser deposition after direct aging heat treatment were compared with those of the deposited state. The tensile strength of the interdendritic Laves phase is increased, which is similar to that of the forgings standard QX3B 548 / 1996 (high strength), while the plasticity decreases slightly. With the prolongation of aging time, the tensile strength and plasticity of the specimen did not increase. After solution treatment, the Laves phase was partially melted and a large number of acicular 未 phases were precipitated around it. The tensile strength reached the standard of forgings, and the elongation after break was 21% higher than that of the deposited state. After homogenization treatment, the Laves phase basically melted and 未 phase was precipitated in grain boundary and crystal. The tensile strength was close to the forgings standard, and the elongation after break exceeded the forgings standard by 27.1%. The results show that proper heat treatment can effectively improve the strength and plasticity of GH4169 alloy repaired by laser deposition.
【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;沈阳工业大学机械工程学院;
【基金】：国家自然科学基金(51375316) 辽宁省自然科学基金(201202173) 航空科学基金(2014ZE54028) 辽宁省高等学校科学研究(L2014054)
【分类号】：TG156;TG146.15

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