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藉助于热模拟技术、光学金相和透射电子显微镜探讨了焊接热循环和拘束应变对ＥＨ３６ＭＯＤ钢粗晶区相变行为影响的基本规律。试验结果表明：ｔ８／５＝６ｓ时，焊接粗晶区发生下贝氏体和马氏体相变；ｔ８／５＝５０ｓ时，则以铁素体的析出和上贝氏体的相变为主。拘束应变可提高焊接粗晶区的相变温度，促进相应相变的发生，同时还细化奥氏体晶粒，使粗晶区组织发生相对变化。适当控制焊接热循环和拘束应变，可改善粗晶区的力学性能
By means of thermal simulation, optical metallography and transmission electron microscopy, the basic laws of the influence of welding thermal cycling and restraining strain on the phase transformation behavior of the coarse grain region of EH36MOD steel were discussed. The results show that the lower bainite and martensite occur in the area of coarse grain welding at t8 / 5 = 6s, and the precipitation of ferrite and the transformation of upper bainite at t8 / 5 = 50s are the Lord. Strain restraint can increase the phase transition temperature of the weld coarse grain region, promote the occurrence of the corresponding phase change, while also refining the austenite grains, the relative changes in the coarse grain region organization. Appropriate control of the welding thermal cycle and binding strain, can improve the mechanical properties of coarse grain