钢轨窄间隙自动电弧焊是一种较新的适应现场的钢轨焊接方法,其焊后热处理规范目前正处于研究阶段.文中通过Gleeble-1500D热模拟试验机,对钢轨窄间隙自动电弧焊的焊接接头试样模拟不同工艺的正火处理,然后测量试样宏观洛氏硬度,进行显微组织观察,并结合维氏显微硬度进行分析.结果表明,正火最高加热温度控制在925~935℃时接头硬度分布比较均匀,晶粒细化效果比较明显,软化区改善较好,为实际生产中正火处理工艺的选择提供了指导.%Narrow gap arc welding on rail is a new way of rail welding to adapt to local condition,and its post weld heat treatments are researching by some researchers.This paper uses the therma simulator of Gleeble-1500D to simulate a series of normalizing treatments on welded joint with narrow gap arc welding,and then measures the Rockwell hardness,watches the microstructure and combines the Vickers microhardness to analyse the welded joint.The result shows that the maximum temperature of normalizing between 925 ℃ to 935 ℃ maybe the best choice,which can make the hardness of welded joint be uniformity distributing,and the effect of grain refining be obvious,and softened zone be eliminated.So it can offer some advice for normalizing treatments in the production practice.
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