A Novel Grain Refinement Design to Inhibit Liquation Cracking in Laser Cladding Non-Weldable Nickel-Based Alloy

Zhenlin Zhang, Yue Zhao, J. Shan, A. Wu, Tokita Shun, Y. Sato, K. Kadoi, H. Inoue, H. Gu, Xin Tang
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Abstract

The liquation cracking is easily induced in the heat-affected zone during laser cladding repairing the non weldable nickel-based superalloy, and there are currently no effective solutions. A novel grain refinement design strategy is proposed for laser cladding repairing non weldable superalloy. In the new strategy, static recrystallization, simulated by the heat from the molten pool, occurs in the plastic deformation region of the base metal pretreated via mechanical shot peening in the heating process of laser cladding. As a result, the coarse columnar crystal structure converts into fine equiaxed crystal structure in the heat-affected zone. The evolution behaviors of liquid film and recrystallization were studied via in-situ observation, and sound laser cladding layers were obtained.
一种抑制激光熔覆不可焊镍基合金熔裂的晶粒细化设计
激光熔覆修复不可焊镍基高温合金时,热影响区容易产生液化裂纹,目前尚无有效的解决方法。提出了一种新的激光熔覆修复不可焊高温合金晶粒细化设计策略。在激光熔覆加热过程中,经机械喷丸强化预处理的母材塑性变形区发生了静态再结晶,并利用熔池热模拟了静态再结晶。结果表明,在热影响区,粗柱状晶体结构转变为细等轴晶体结构。通过原位观察研究了液膜的演化行为和再结晶行为,获得了声音激光熔覆层。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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