本文通过动态热模拟试验及充氢缓慢拉伸试验分祈研究了GC4中碳低合金超高强度钢焊接热影响区液化微裂纹的产生条件及其对氢致裂纹产生的影响，发现液化裂纹的产生主要决定于焊接热影响区的高温停留时间和母材焊前的偏析情况;焊接热影响区液化微裂纹的存在将成为氢致裂坟的裂源，促进焊接氢致裂纹或其它工序中氢脆的产生。
Abstract
In this paper, occurcnc condition of HAZ liquated micro-cracking and its effects on hydrogen-induced cracking in ultra-high strength steel GC4 were investigated with dynamic thermal simulation test and hydrogen charged slowtensile test.It was found that the occurence of liquated cracking is mainly depended on the time range in which the HAZ stay at high temperature and the segragation degree of base metal.Moreover, HAZ liquaced micro-cracks will become the starting position or the propagating pathes of hydrogen-induced cracking, and promotes the hydrogen embrittlemcnt during later process
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