电子束焊接热冲击对GH4133A的微裂纹损伤研究

摘要

电子束焊接是一个复杂的强瞬态的热冲击过程，包括发生在表层的热过程和发生在一定深度的应力波与材料的交互作用。本文基于电子束焊接热冲击效应分析了高温合金电子束焊接接头热影响区的微裂纹形成原因，研究了微裂纹损伤对GH4133A电子束接头高温力学性能的影响。结果表明，热冲击是高温合金电子束焊接热影响区的微裂纹损伤的主要原因，热冲击损伤效应导致接头力学性能的劣化。%Electron beam welding (EBW) process is a complicated and violent instantaneous thermal shock process that consists of a thermal process occurred on the weldment surface and interactional mechanical process existed between the stress wave and base metal in certain depth. The reason of heat-affected zone (HAZ) microfissuring presented in superalloy EBW joints was analyzed based on thermal shock effect.The influence of microfissuring damage on high temperature mechanical properties of EBW joints were also discussed. The results show that the HAZ microfissuring damage of superalloy EBW joints induces mechanical properties deterioration which is attributed to the EBW thermal shock.