Abstract: In order to clarify the evolution law of microstructure in the repair welding area of ZG06Gr13Ni4Mo martensitic stainless steel under different repair times, GTAW was used to repair 40 mm ZG06Gr13Ni4Mo once and twice, temper at 600 ℃ for 2 hours after each repairing. OM, SEM, EBSD and TEM were used to detect the microstructure changes of the base metal and the repair area under different repair times, and the microstructure evolution law of the repair area was studied. The results show that the phase of the repaired area is mainly composed of martensite and a small amount of reversed austenite, which is distributed in the boundary of martensite and matrix in the form of thin laths. The content of reversed austenite in the repair welding areas increases with the increase of repair welding times, and the content of reversed austenite in the weld zone is greater than that in heat affected zone. In addition, the grain size in the repaired joint tends to refinement. Compared with the base metal, the grain size in the once and twice weld zone is refined by 45.2% and 61.9%, while the grain size in the weld zone is refined by 40.8% and 48.3% respectively compared with that in the heat affected zone, and the size of reversed austenite is about 50% of that of martensite. The orientation of texture changes from 〈101〉 to anisotropy, the small angle grain boundary decreases and the large angle grain boundary increases.With the increase in the number of repairing welds, the hardness and strength of the repaired joints decrease gradually, and the yield strength and plasticity increase gradually.
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2023, Vol. 37 
