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在用高强钢制造大型压力容器的过程中,焊后必须进行热处理以消除应力。一些研究指出,钢中硼及硼化物的析出和聚集以及在焊接接头区域的分布状态会直接影响SR裂纹的敏感性。本文采用α粒子径迹照像技术研究了含硼Mn-Mo-Nb钢中几种热处理规范下,硼在焊接接头区的分布及其对SR裂纹敏感性的影响。 1.材料和方法 试验用材料为含硼40ppm、厚度为28mm的Mn-Mo-Nb钢板。焊后进行了不同的后热处理及600℃2小时消除应力处理。SR裂纹敏感性试验采用Y型坡口拘束抗
In the manufacture of large-scale high-strength steel pressure vessel process, after welding must be heat treatment to eliminate stress. Some studies indicate that the precipitation and aggregation of boron and boride in steel and the distribution in the welded joint region directly affect the SR crack sensitivity. In this paper, the distribution of boron in the welded joints and its effect on SR crack susceptibility of boron-containing Mn-Mo-Nb steels were investigated by using α-particle track photography. 1. Materials and Methods The test materials were Mn-Mo-Nb steel plates containing 40 ppm boron and 28 mm thickness. After welding after a different post-heat treatment and 600 ℃ 2 hours to eliminate stress treatment. SR crack sensitivity test using Y-groove restraint resistance