Effect of Heat Treatment on the Microstructure and Properties of K4169 Repaired by Laser Deposition

IF 0.9 4区材料科学 Q4 METALLURGY & METALLURGICAL ENGINEERING

Russian Journal of Non-Ferrous Metals Pub Date : 2025-07-14 DOI:10.1134/S1067821225600474

Bo He, Peng Xu, Donglai Li, Yuhang Ren, Guang Yang

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Abstract

To address the defects and damage to high-temperature K4169 alloy components during casting and processing, as well as during service, laser deposition repair of K4169 alloy was carried out and the effect of heat treatment on the microstructure and properties of the repaired samples was investigated. After aging heat treatment, a large number of γ' phases and a small number of γ'' phases precipitated in both the repair zone and the substrate zone, but the δ phase was still observed only in the substrate, the number did not change significantly, the strength of the repaired sample improved, and the plasticity decreased. After solution + aging heat treatment, more γ'' phases precipitated from the sample, which led to a further increase in strength. The precipitation of the δ phase was observed in the repair zone, the number and distribution scope of δ phases in the substrate zone increased. In addition, the plasticity was greater than that of the aged sample because of the dissolution of the brittle Laves phase and the cutting effect of the δ phase.

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热处理对激光沉积修复K4169组织和性能的影响

针对高温K4169合金零件在铸造、加工和使用过程中存在的缺陷和损伤，对K4169合金进行了激光沉积修复，研究了热处理对修复试样组织和性能的影响。时效热处理后，在修复区和基体区均析出大量γ′相和少量γ′相，但仅在基体中仍有δ相析出，且δ相数量变化不明显，修复试样的强度提高，塑性降低。固溶时效热处理后，试样析出更多的γ”相，使强度进一步提高。修复区δ相析出，基体区δ相数量增加，分布范围扩大。此外，由于脆性Laves相的溶解和δ相的切削作用，合金的塑性比时效试样大。

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来源期刊

Russian Journal of Non-Ferrous Metals METALLURGY & METALLURGICAL ENGINEERING-

CiteScore

1.90

自引率

12.50%

发文量

审稿时长

3 months

期刊介绍： Russian Journal of Non-Ferrous Metals is a journal the main goal of which is to achieve new knowledge in the following topics: extraction metallurgy, hydro- and pirometallurgy, casting, plastic deformation, metallography and heat treatment, powder metallurgy and composites, self-propagating high-temperature synthesis, surface engineering and advanced protected coatings, environments, and energy capacity in non-ferrous metallurgy.