Prediction of Residual Stresses during Stress-Relief Annealing on Martensitic Stainless Steel AISI 420
Laksamee Angkurarach and Patiphan Juijerm** Author for corresponding; e-mail address: juijerm@gmail.com, fengppj@ku.ac.th
Volume: Vol.47 No.2 (Special Issue I : March 2020)
Research Article
DOI:
Received: 20 September 2019, Revised: -, Accepted: 21 January 2020, Published: -
Citation: Angkurarach L. and Juijerm P., Prediction of Residual Stresses during Stress-Relief Annealing on Martensitic Stainless Steel AISI 420, Chiang Mai Journal of Science, 2020; 47(2): 312-318.
Abstract
Residual stresses at the surface and in near-surface regions were intentionally generated by near-surface plastic deformation called deep rolling process. X-ray diffraction (XRD) technique was used to measure the residual stresses. Specimens with generated residual stresses at the surface were stress relieved by mean of heating at a temperature range of 300–600 °C with different soaking times of 0.1–10,000 min. It was found that generated residual stress of about -650 MPa was detected at the surface after the deep rolling process. Residual stresses decreased with increasing temperature and soaking time. A decrease of residual stresses during the stress-relief annealing was analyzed using the Zener-Wert-Avrami function. The activation enthalpy of residual stress relief was 2.64 eV, which was closed to the activation enthalpy of the iron self-diffusion. The results clearly indicated that the predominant relief mechanism was most likely the volume diffusion-controlled climbing of edge dislocations. Finally, simulation diagram of residual stress relief was shown with an overall error about 15%. Keywords: Residual stress; Stress relief; Heat treatment; Stainless steel
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