Effect of Fatigue Test on Material Microstructure of GIS Bellows Compensator
This article conducts hardness testing,microstructure observation and chemical composition analysis on GIS bellows compensators before and after fatigue testing,in order to provide reference for improving the manufacturing process of GIS bellows compensators.The test results show that without fatigue testing,the hardness at the straight edge of the sample is the lowest,and the hardness at the trough is the highest.Under the same location conditions,the hardness of the specimens subjected to fatigue testing is greater than that of the specimens not subjected to fatigue testing.The microstructure of the samples is composed of austenite and martensite,with the highest grain size at the trough(fracture surface)position after fatigue testing.The larger grain size leads to an increase in strength at the trough of the sample.The results of chemical composition analysis indicate that the chemical composition of the sample undergoes segregation before and after fatigue testing,and element segregation can lead to martensitic transformation in austenitic stainless steel.
austenitic stainless steelmartensitic transformationgrain sizecompositional segregationfatigue test
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