摘要
本研究用KD286焊条进行了伤损钢轨的焊补实验,并进行了未上道运行焊补层和上道运行后的焊补层的的组织性能对比研究。研究结果表明:在不预热条件下,用KD286焊补钢轨,焊缝组织为柱状奥氏体组织,熔合区和过热区不可避免地产生脆硬的马氏体组织。而且KD286焊补后的焊缝中的奥氏体组织在运行过程中,受列车轮对的冲击、碾压下将转变为脆硬的马氏体,这将降低焊补层的冲击韧性,加快焊补层的剥离。
The repairing experiment on rail with defects by surfacing welding with KD286electrode is introduced in this paper.The properties and microstructures of weld joints either to be welded or after a period service are researched.The results show that:under the no preheating condition,the microstructure of weld metal is columnar austenitic,and brittle martensite exists in the fusion zone and over-heated zone unavoidably.The austenitic in the weld metal will be transform ed into martensite under impaction of rail wheels,which will reduce the im pact toughness of the weld metal and quicken dropping of welded metal.
出处
《电焊机》
2002年第7期29-31,共3页
Electric Welding Machine
基金
西南交通大学科研基金资助项目(2000A01)
