一、前言从成本、生产工艺和使用性能角度考虑,多采用铸铁作柴油机配气机构挺柱的材料。为保证其耐磨性,与凸轮相接触的挺柱表面常采用冷激处理。但为改善其抗点蚀的能力,还要对其作调质硬化处理,以得到马氏体和渗碳体相混合的金相组织。由于柴油机采用涡轮增压,其输出功率 First, the preface From the cost, production technology and performance perspective, the use of cast iron for diesel engine valve tappet material. In order to ensure its wear resistance, the surface of the tappet in contact with the cam is often used cold shock treatment. However, in order to improve its anti-pitting ability, but also for its hardening treatment, in order to get mixed martensite and cementite microstructure. Due to the turbocharged diesel engine, its output power