Surface integrity analysis of 304 stainless steel after slurry blasting

Abstract. The Eco Pickled Surface technology has attracted increasing attention due to its green and environmentally friendly characteristics. However, due to the complex internal structure of the oxide skin and the diverse bonding methods with the substrate surface, as well as the failure to establish a relationship between the substrate surface integrity and process parameters after descaling, the widespread application of this technology is restricted. The 304 stainless steel hot-rolled plates and strips had been researched in this article, and the finite element ANSYS/AUTODYN modules had been used to simulate the descaling process; An analysis was conducted on the surface integrity of 304 stainless steel after descaling, including roughness, residual stress, and corrosion resistance. The results showed that: The maximum temperature on the substrate surface under different abrasive particle sizes, blasting speeds, and blasting angles is 95℃;the impact range and depth of the substrate surface after slurry blast will increase with the increase of abrasive particle size and injection speed, The maximum hardened layer after slurry impact is 140 μm; The minimum corrosion current density on the substrate surface after slurry impact can reach 1.29*10-6A/cm2, the corrosion resistance of the substrate surface has been significantly improved, and the EBSD results show that the grains after slurry impact are concentrated in 4-19 μm, maximum 22 μm. The average grain size is 10.79 μm.