Microstructure and Cavitation-Erosion Mechanism of Laser Cladding NiCrSiB Coating on CrNiMo Stainless Steel
A Ni-based alloy NiCrSiB laser cladding layer was made on the surface of CrNiMo stainless steel specimens using NiCrSiB powder. Cavitation erosion behavior of the laser cladding layer and the CrNiMo stainless steel was investigated by ultrasonic vibration cavitation erosion equipment The results shown that laser cladding layer has dense microstructure and has metallurgical combination with CrNiMo stainless steel substrate. Because of impact effect of cavities collapse, micro-cracks caused material broke off from samples. NiCrSiB laser cladding layer have better micro-crack propagate resistance property than CrNiMo stainless steel.Laser cladding layer has better cavitation resistance properties because of strengthening effect by precipitated phases such as M23[CB]6、CrB、CrSi、Fe2B、B4C and work hardening effect during cavitation erosion process.
Zhengyi Jiang, Xianghua Liu and Jinglong Bu
X. B. Zhang et al., "Microstructure and Cavitation-Erosion Mechanism of Laser Cladding NiCrSiB Coating on CrNiMo Stainless Steel", Advanced Materials Research, Vols. 154-155, pp. 1788-1791, 2011