Effect of Eco Pickled Surface Treatment on Hydrogen Embrittlement Sensitivity of QStE700TM Steel
The effect of surface treatments of Eco Pickled Surface(EPS),picking and blasting on the hydrogen embrittlement(HE)susceptibility and hydrogen permeation kinetic of QStE700TM high-strength structural steel was comparatively assessed via slow strain rate tension(SSRT)and double elec-trolytic cell electrochemical hydrogen permeation device.The influence of surface treatment processes on the HE susceptibility of QStE700TM steel was discussed in terms of the variations of residual oxide scale,hardness and residual stress on the surface of steel plates subjected to different surface treat-ments.The results showed that the HE susceptibility of QStE700TM steel treated by EPS technique was only 8.1％,which is 12.7％and 20.5％lower than that by pickling and blasting,respectively.It would be re-lated to the less residual oxide scale and the existed residual compressive stress on the surface of the steel plate treated by EPS.In addition,smaller hydrogen diffusion flux(J∞L)and effective hydrogen diffu-sion coefficient(Dapp)and larger lag time(tL)and cathode side subsurface hydrogen concentration(c0),should be responsible for the lower HE susceptibility of the steel samples treated by EPS.Take all factors into account,the EPS is a new,reliable,low-carbon and environmentally friendly surface descaling tech-nology for high-strength steel.
万方数据
维普
