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本文利用高温金相显微镜直接观察GH99镍基高温合金钨极氩弧焊焊缝和热影响区在1200℃和一定应力、应变条件下的组织变化和热裂纹的起始、扩展、断裂的动态过程,研究合金的化学成分、组织及所受应力、应变对焊接热裂纹(结晶裂纹和液化裂纹)的影响。研究结果表明,影响热裂纹的主要因素是合金的化学成分,尤其是Al、Ti含量及Al/Ti(含量)比值,应力和应变也有一定的影响。化学成分决定了合金的零塑性温度,零塑性温度较高的合金的热裂纹倾向小,低者热裂纹倾向大。
In this paper, the microstructure of GH99 Ni-based superalloy TIG weld and heat affected zone (HAZ) at 1200 ℃ under certain stress and strain and the dynamic process of initiation, propagation and fracture of hot crack , The study of the chemical composition of the alloy, the organization and the stress and strain on the hot weld cracking (crystal cracks and liquefied cracks). The results show that the main factors affecting hot cracking are the chemical composition of the alloy, especially Al, Ti content and Al / Ti (content) ratio, the stress and strain also have a certain impact. The chemical composition of the alloy determines the zero plastic temperature, zero plasticity temperature higher alloy hot cracking tendency, the lower the tendency of hot cracking.