LI Quan\|ming1, GUAN Ping2

（1. Zhejiang Kunbo Machinery & Manufacturing Co., Ltd., Haiyan 314300, China；

2. Zhejiang Institute of Mechanical & Electrical Engineering, Hangzhou 310053, China）

 

 

Abstract: Aiming at the flaws of high chromium cast iron, such as coarse microstructure, low obdurability and easy to crack, the experiments of laser cladding were made. Highchromium (Cr) cast iron powder was used as cladding material. The microstructure and hardness of laser cladding layer were studied. The effect of different scanning speed on microstructure and hardness was researched. The laws of overlapping and buildingup were analyzed. The hardness distribution curve of laser buildingup cladding was also tested. The results indicate that highCr cast iron cladding layer has better properties such as minute crystals, high density, no crack, no gas cavity and high hardness (580 HV0.2). Using laser cladding, the good wear layer would be made on the surface of parts which would greatly increase the useful life of parts.

Key words: laser cladding; highCr cast iron; scanning speed; microstructure; hardness