Study on Surface Properties and Thermal Relaxation Behavior of Residual Stress Field of Carburizing GDL-1 Steel after Abrasive Water Jet Peening

doi:10.3901/JME.2017.22.043

Abstract

Abstract: After carburizing and air-cooling, the GDL-1 steel is strengthened and modified by abrasive waterjet peening. LEXT, SEM, TEM, micro hardness tester and X-ray diffraction is used to analyze the variation of surface roughness, microstructure, hardness and residual stress etc. under different water pressure. Besides, the thermal relaxation behavior of residual stress field at different holding temperature and holding time is investigated after abrasive waterjet peening of 300 MPa pressure. The results show that with the increase of water pressure, the surface roughness, the amount of retained austenite transformation and the surface hardness is increased. After water jet peening, the microstructure and grain is greatly refined and a certain depth of residual compressive stress field is formed on the surface. The thermal relaxation of residual stress is mainly influenced by the aging time and temperature. At 100℃ and 300℃, the relaxation mechanism of residual stress is controled by the recovery process. At 500℃, the relaxation mechanism is controled by the recovery and recrystallization process. There are two stages in the process of recovery of surface residual stress, At the initial stage, the stress relaxation rate is fast and dominated by the point defect recovery. At the latter stage, the relaxation rate is slow and mainly dominated by the dislocation recovery, and the Wert-Avrami-Zener equation is not suitable to describe the whole process of recovery.

Key words: abrasive water jet peening, residual stress thermal relaxation, steel, surface properties

CLC Number:

TG178

ZOU Xiong, LIANG Yilong, WU Zeli, YANG Ming, HU Junjie. Study on Surface Properties and Thermal Relaxation Behavior of Residual Stress Field of Carburizing GDL-1 Steel after Abrasive Water Jet Peening[J]. Journal of Mechanical Engineering, 2017, 53(22): 43-49.

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