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测定了ＷＦＧ３６Ｚ钢焊缝金属及母材的疲劳裂纹扩展速率及阈值，给出了亚临界扩展区域的疲劳裂纹扩展速率及△Ｋ之间的定量关系，并进行了相应的分析比较．
The fatigue crack growth rate and threshold of the weld metal and base metal of WFG36Z steel were measured. The quantitative relationship between fatigue crack growth rate and △ K in the subcritical expansion zone was given, and the corresponding analysis and comparison were made.