Abstract：To improve the hydrogen permeation resistance of 18CrNiMo7-6 steel,it was strengthened by ultrasonic surface rolling process (USRP) under different static pressure,the hardness of the sample in the cross section and the residual stress of the surface layer of the material were measured,and the effect of USRP on the surface integrity and hydrogen permeation property of 18CrNiMo7-6 steel was analyzed. To further explore the influence of residual stress generated by USRP on the hydrogen permeation,URSP and stress-coupled hydrogen diffusion process was simulated in ABAQUS finite element software. The results show that with the increase of static pressure,the surface microhardness and surface compressive residual stress obtained by USRP gradually increase,and the hydrogen permeability decreases; When the static pressure of USRP is 100,200,300,400 N,the surface microhardness increases by 14%、15%、19%、27% compared with the sample without USRP,the surface compressive residual stress increases by 513%、943%、1 013%、1 063% and the hydrogen permeation parameter decreases by 30%,32%,36%,55% compared with the sample without USRP. The numerical simulation results show that USRP causes compressive residual stress with gradient distribution,and the influence depth and maximum value of compressive residual stress are positively correlated with static pressure; Hydrogen diffuses in the material driven by the concentration gradient. The hydrogen mass percent in the area treated by USRP decreases rapidly along the depth direction,and the largest decline was appeared at the depth of 100 μm from the top surface. The distribution trend of hydrogen mass percent is the same with that of hydrostatic stress,the hydrogen mass percent is low where hydrostatic compressive stress exists,and the hydrogen mass percent is high where hydrostatic tensile stress exists. The compressive residual stress produced by USRP can inhibit hydrogen permeation.
王刚, 顾飞翔, 秦瑾鸿, 李俊昊, 彭振龙. 超声滚压对18CrNiMo7-6合金钢抗氢渗透性能的影响[J]. 钢铁, 2023, 58(7): 125-132.
WANG Gang, GU Feixiang, QIN Jinhong, LI Junhao, PENG Zhenlong. Effect of ultrasonic surface rolling process on hydrogen permeation resistance of 18CrNiMo7-6 steel[J]. Iron and Steel, 2023, 58(7): 125-132.
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2023, Vol. 58 
