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研究了变形速率对低合金结构钢 3 5CrMo磨擦焊接头组织与力学性能的影响 .结果表明 ,增加变形速率可改善焊缝韧性 .焊缝韧性改善的机理为近缝区晶粒细化和硬度降低 .采用金相法、TEM法对近缝区粒状组织精细结构进行了观察 ,粒状组织小岛由M -A组成 .指出增加变形速率使近缝区金属强化机制为位错强化、一定数量的岛状第二相强化和细晶粒强化 .通过测试异种金属焊缝界面近区碳浓度的分布 ,探讨变形速率对磨擦焊最高加热温度的影响 ,增加变形速率可使磨擦焊界面的最高加热温度下降
The effect of deformation rate on the microstructure and mechanical properties of 35CrMo friction welded joints of low alloy structural steel was studied.The results show that the increase of deformation rate can improve the toughness of the weld.The mechanism of weld toughness improvement is that the grain refinement and hardness decrease The fine structure of the granular structure in the near-seam area was observed by the metallographic method and the TEM method, and the granular structure island was composed of M-A.It was pointed out that increasing the deformation rate makes the metal strengthening mechanism in the near-seam area as dislocation strengthening and a certain number of islands Two-phase strengthening and fine-grained strengthening.Through testing the distribution of carbon concentration near the interface of dissimilar metal weld, the effect of deformation rate on the maximum heating temperature of friction welding is discussed, and the maximum heating temperature of friction welding interface can be decreased by increasing the deformation rate