摘要
用Gleeble-1500热模拟试验机对试验钢进行不同焊接工艺下的热模拟试验,研究焊接热影响区的组织、冲击性能、冲击断口。探讨了不同t8/5(30～600 s)对试验钢中贝氏体组织组成及形态的影响以及组织与低温韧性的关系,并进行了碳当量和焊接裂纹敏感性指数计算。结果表明,试验钢的焊接性能良好:当t8/5≤60s时,试验钢焊接热影响区冲击性能与母材相近,具有较好的低温韧性;当t8/5在60～300s时,热影响区的冲击性能低于母材,但达到国家标准的要求(34J),因此该材料可以在较宽的冷速范围内进行焊接处理。
The microstructure properties, impact toughness and impact fracture of HAZ in an ultra-low carbon bainitic steel were investigated by welding simulation on a Gleeble-1500 thermal simulator. The influences of different t8/5 on the bainitic morphology and the relationship between the microstructure and low temperature toughness were discussed. The results indicate that the bainitic steel has excellent welding performance. The impact toughness of HAZ is similar to matrix material when t8/5 is below 60 s, so it has excellent low temperature toughness, the impact toughness of HAZ is lower than matrix material when t8/5 is between 60s and 300s,but it reaches the national standard（34J）. Above all, the bainitic steel can be welded at wide cooling rate.
出处
《热加工工艺》
CSCD
北大核心
2012年第19期5-7,10,共4页
Hot Working Technology
关键词
建筑结构
超低碳贝氏体钢
焊接性能
冲击性能
t8/5
building structure
ultra-low carbon bainitic steel
welding performance
impact properties
t8/5
