大线能量低焊接裂纹敏感性钢的焊接(一)——热影响区强韧性机理研究  

Welding of High Heat Input Welding Steel with Low Susceptibilityto Welding Crack(Ⅰ)——Research on Toughening Mechanism of HAZ

作　　者：张莉芹[1] 袁泽喜[1] 陈晓[2] 卜勇[2] 

机构地区：[1]武汉科技大学 [2]武汉钢铁(集团)公司技术中心

出　　处：《压力容器》2002年第7期29-34,共6页Pressure Vessel Technology

摘　　要：利用焊接热模拟技术对一种 6 10MPa级大线能量低焊接裂纹敏感性钢的热影响区 (HAZ)强韧化机理进行了研究。结果表明 :在大线能量焊接条件下 ,该钢HAZ的强韧性决定于HAZ组织中针状铁素体的含量和形态 ,其含量越高、越细小 ,对HAZ的强韧性越有利 ;钢中TiN粒子的存在可促进HAZ针状铁素体的形核 ,且当钢中Ti/N比值接近理想化学配比 3.4 2时 ,可明显细化针状铁素体 ,提高HAZ韧性。The strengthening and toughening mechanism of heat affected zone (HAZ) of a high property pressure vessel steel--610MPa grade high heat input welding steel with low susceptibility to welding crack was investigated in this paper by using welding thermal simulation technology. The results showed that the strength and toughness of HAZ under high heat input welding was decided by the content and appearance of acicular ferrite in the microstructures of HAZ,the more the content and the finer the appearance, the higher the strength and toughness. The existence of TiN particles in steel promoted the nucleation of acicular ferrite in HAZ. When the ratio of Ti/N in the steel approximated the ideal chemistry ratio 3.42, the acicular ferrite became finer, and it improved the strength and toughness of HAZ.

关 键 词：大线能量焊接 低焊接裂纹敏感性钢 热影响区 热模拟 针状铁素体 压力容器 

分 类 号：TG457.5[金属学及工艺—焊接] TG457.11