Influnce Of Microshot Peening On Surface Characteristics Of High-speed Tool Steel

Author:  Y. Harada, Y. Kobayashi, E. Nagashima, H. Ta
Source:  Conf Proc: ICSP-10 Tokyo, Japan 2008
Doc ID:  2008119
Year of Publication:  2008
Abstract:  
ABSTRACT The influence of microshot peening on the surface characteristics of the high-speed tool steel was investigated. In general, shot media used for peening consists of small spheres. More recently, new media have been developed to enhance the peening effect. They are made of cemented carbide or amorphous alloy, and the diameter is in the range from 0.02 to 0.20 mm. The use of new media is effective for the hard material such as tool steels. In the experiment, a compressed air-type microshot peening apparatus with a heating furnace was produced experimentally. The peening microshots were 0.1 mm in diameter, and the workpiece was made of high-speed tool steel. Surface roughness, compressive residual stress, and hardness of the peened workpieces were measured. The influences of processing temperature on the surface characteristics by warm peening were also examined. The use of hard microshot was shown to cause a significantly enhanced peening effect for highspeed tool steel. KEY WORDS Microshot peening, high-speed tool steel, residual stress, hardness