激光沉積修復GH4169合金熱處理的組織及性能
[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.
【作者單位】: 沈陽航空航天大學航空制造工藝數(shù)字化國防重點學科實驗室;沈陽工業(yè)大學機械工程學院;
【基金】:國家自然科學基金(51375316) 遼寧省自然科學基金(201202173) 航空科學基金(2014ZE54028) 遼寧省高等學?茖W研究(L2014054)
【分類號】:TG156;TG146.15
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