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利用焊接热模拟技术,在疲劳试样上模拟出与实际焊接热影响区不同组织区相近的组织,并用这些试样进行了疲劳寿命和疲劳裂纹扩展实验。通过了解焊接热影响区不同组织区的腐蚀疲劳性能,研究了焊接过程对CF-60钢腐蚀疲劳性能的影响。结果发现:焊接过程降低了CF-60钢的耐腐蚀疲劳性。其原因在于,焊接热影响区中的不完全重结晶区的腐蚀疲劳性能低于母材和其它组织区的疲劳性能。不完全重结晶区的耐蚀性最差是其腐蚀疲劳性能下降的主要原因之一。
Using the welding thermal simulation technique, the microstructures of the samples in the heat affected zone (HAZ) were simulated on the fatigue specimens, and the fatigue life and fatigue crack propagation experiments were carried out with these specimens. By understanding the corrosion fatigue properties of different regions of HAZ, the influence of welding process on the corrosion fatigue properties of CF-60 steel was studied. The results showed that the welding process reduced the corrosion fatigue resistance of CF-60 steel. The reason for this is that the corrosion fatigue properties of the incompletely recrystallized zone in the weld heat affected zone are lower than the fatigue properties of the base metal and other tissue zones. Incomplete recrystallization zone corrosion resistance is the worst corrosion corrosion performance degradation of one of the main reasons.