以Abaqus软件为平台，开发了用于模拟激光熔覆过程温度场和应力场的非线性有限元计算方法。根据激光熔覆过程的特点，通过开发Abaqus用户子程序建立了相应的移动热源模型。利用开发的计算方法，对激光单道单层熔覆、单道双层熔覆和单道十层熔覆过程的温度场和应力场进行了数值模拟。基于数值模拟结果，对激光熔覆的温度场特征和焊接应力的演化过程进行了探究。数值模拟得到的温度-应力演化过程结果将有助于理解激光熔覆过程中冶金缺陷(如热裂纹)的形成机理和提出相应的防止对策。

Based on Abaqus code, a nonlinear finite element method is developed to simulate temperature field and stress distribution in 718 alloy induced by laser cladding. According to the characteristics of laser cladding, a moving heat source model is established through developing a user subroutines in Abaqus code. Temperature and residual stress fields in single-channel monolayer cladding, single-channel double layers cladding and singlechannel ten layers cladding are calculated using the developed computational approach. The features of temperature field and the formation of stress are investigated numerically. The results obtained from this research are helpful in deeply understanding mechanism of metallurgical defects such as hot cracking and are also beneficial for finding measures to prevent the occurrence of these defects.