多次补焊对SMA490BW钢焊接过热区冲击性能的影响
Influence of Multiple Repair Welding on Impact Toughness of Overheating Zone of SMA490BW Steel
李丹丹1, 张志毅2, 史春元1
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作者单位：（1.大连交通大学 材料科学与工程学院, 辽宁 大连 116028;2.南车青岛四方机车车辆股份有限公司 技术工程部, 山东 青岛 26111）
中文关键字：SMA490BW转向架用钢; 多次补焊; 焊接过热区；冲击性能
英文关键字：SMA490BW steel； multiple repair welding； overheating zone； impact toughness
中文摘要：通过焊接热模拟及焊接接头多次补焊试验,分析了转向架SMA490BW钢焊接过热区多次补焊后的组织与冲击性能变化。结果表明：SMA490BW钢经历3次及以上峰值温度为1320℃的焊接热循环后,过热区形成粗大的魏氏组织,导致冲击性能显著降低。为此,在接头返修时,根据缺陷尺寸及位置,若将挖补区限制在焊缝内部,且离开熔合线一定距离,多次补焊后再进行(590±15) ℃×2 h退火处理,则过热区冲击性能明显改善,并优于焊态下过热区的冲击性能。
英文摘要：By welding thermal simulation method and multiple repair welding tests for the welded joint, the variation of microstructure and toughness of the overheating zone of SMA490BW bogie steel after multiple repair welding were analyzed. The results indicate that the coarse widmanstatten appears in overheating zone and the impact toughness significantly reduces after three times or more welding thermal cycles when the maximum temperature is 1320 ℃. So, when the welded joints are reworked, if the repairing parts are limited in the interior of weld and leave a certain distance from fusion line based on the size and position of defects, and then the （590±15）℃×2h annealing treatment is carried out after multiple repair welding, the toughness of overheating zone can be obviously improved which is better than the ones as-welded condition.