激光热处理对1Cr5Mo钢焊接接头组织结构的影响

发布时间：2018-05-14 04:02

本文选题：激光热处理 + CrMo耐热钢　；参考：《材料工程》2017年01期

【摘要】：利用CO_2激光对1Cr5Mo耐热钢焊接接头进行表面热处理,通过4XC型光学显微镜对激光热处理前后焊接接头各区显微组织和晶粒度等级进行分析,并采用X射线应力仪测定激光热处理前后焊接接头残余应力和残余奥氏体的分布规律。结果表明:经激光热处理后1Cr5Mo耐热钢焊接接头表面晶粒发生细化,焊缝区、熔合区、过热区和正火区晶粒等级由9级、9.8级、8级和10.7级提升至10级、10.2级、8.5级和11级,组织结构薄弱区域由过热区、焊缝区和熔合区减少为过热区,均匀性得到了明显改善;激光热处理消除了焊接接头表面残余拉应力,形成了深度约为0.28mm的残余压应力层,残余奥氏体含量有所提高,分布更均匀,有利于改善其力学性能。
[Abstract]:The surface heat treatment of the welded joint of 1Cr5Mo heat-resistant steel was treated by CO_2 laser. The microstructure and grain degree of the welded joints were analyzed by 4XC optical microscope before and after the laser heat treatment. The distribution of residual stress and retained austenite before and after laser heat treatment was measured by X ray stress analyzer. After laser heat treatment, the surface grain of 1Cr5Mo heat-resistant steel welded joint was refined. The grain grade of weld zone, fusion zone, superheated zone and normalizing zone were raised from 9, 9.8, 8 and 10.7 to grade 10, 10.2, 8.5 and 11, and the weak area of tissue structure was reduced from superheated area, weld zone and fusion zone to superheated area, and uniformity was obvious. The residual tensile stress of the welded joint is eliminated by laser heat treatment, and the residual compressive stress layer of 0.28mm is formed. The residual austenite content is improved and the distribution is more uniform, which is beneficial to improve the mechanical properties of the welded joint.

【作者单位】：常州大学机械工程学院;常州大学江苏省材料表面科学与技术重点实验室;常州大学石油化工学院;
【基金】：江苏省科协首席专家(工程师)资助项目(2013-216) 江苏省普通高校研究生科研创新计划资助项目(CXLX14-1098)
【分类号】：TG457.11;TG156.99

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