預熱下激光沉積修復GH4169合金表面損傷的殘余應力和拉伸性能

預熱下激光沉積修復GH4169合金表面損傷的殘余應力和拉伸性能Residual stress and tensile property of laser deposition repair GH4169 alloy surface damage with preheating

結合GH4169高溫合金表面損傷的修復需求，研究基體預熱對不同基體厚度的激光沉積修復GH4169高溫合金試樣殘余應力、顯微組織、拉伸性能的影響規律。結果表明：與未預熱修復試樣相比，基體預熱300 ℃的GH4169合金激光沉積修復試樣的殘余應力σx、σy均明顯降低，修復區枝晶間析出的Laves相變得粗壯并呈現顆粒狀的碎化趨勢，抗拉強度略微降低，但斷后伸長率提高60%以上，達到鍛件標準。基體厚度越大，修復體厚度越小，修復試樣的殘余應力減小，枝晶間析出的Laves相減少，抗拉強度與斷后伸長率均略有增加。

Combining with the repairing demand of GH4169 alloy surface damage, the effect of substrate preheating process on the residual stress, microstructure and tensile property of laser deposition repair (LDR) GH4169 alloy specimen with different substrate thickness were investigated. The results show that, in contrast to repaired specimen without preheating, laser deposition repair GH4169 alloy after the substrate is preheated to 300 ℃, both σx and σy of residual stress are reduced obviously. The Laves phase of the interdendritic in deposition becomes thick, and it presents a granular fragmentation phenomenon. The tensile strength is reduced slightly, but the elongation rate increases above 60%.These indicate that the standard of forging is reached. With the bigger substrate thickness and the smaller deposition thickness, the residual stress and Laves phase of the interdendritic of repaired specimen are decreased, the tensile strength and elongation are improved slightly.

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