前言近年来,从事材料研究和热处理的技术人员,对氮化表现出特别浓厚的必趣,这是因为人们最近重新评价了氮化技术对小汽车的轻量化、低噪音化的意义。氮化的特点在于可获得低变形度的表面硬化及高的回火软化抵抗性。但是,氮化的最大缺点是处理时间长。和小汽车、机床、压力机等一般的工业机械部件相比,工程机械部件往往在高峰值转矩、苛刻的 Preface In recent years, technicians engaged in material research and heat treatment have shown a particularly strong interest in nitriding because of the recent reevaluation of the significance of nitriding technology in light-weight and low-noise automobiles. Nitriding is characterized by low degree of surface deformation and high temper softening resistance. However, the biggest disadvantage of nitriding is the long processing time. And the car, machine tools, presses and other general industrial machinery parts compared to the construction machinery parts are often high peak torque, harsh