Abstract
The thermal relaxation behavior of residual stress and microstructure at elevated temperatures in S30432 austenite steel after shot peeningwas investigated by X-ray residual stress analyzer. The effect of the exposure time and the applied temperature on the residual stress andmicrostructure relaxation was particularly analyzed and discussed. A significant decrease of the residual stress values and peak breadth wasobserved in the first period of exposure time, followed by slowing down and then stabilization. It was also observed that a higher appliedtemperature produced greater relaxation. The relaxation behavior could be described by ZenerWertAvrami function. The thermal stability ofmicrostructure was higher than that of the residual stress. Both of the activation enthalpy of residual stress and microstructure relaxation werehigher than that of iron self-diffusion in £-Fe. [doi:10.2320/matertrans.M2012058](Received February 15, 2012; Accepted March 26, 2012; Published May 25, 2012)Keywords: thermal relaxation, residual stress, microstructure, S30432 austenite steel
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