一、前言国外高速柴油机重量轻、功率高,在国际高速柴油机系列中自60年代至今仍然处于优势。18CrNiWA 钢制的主连杆是该机的关键运动部件。为了提高国产高速柴油机的可靠性,上海交大和河南柴油机厂对国外60年代主连杆(S—60),七十年代主连杆(S—70)和国产主连杆(CH—60)从钢材成分分析、实物解剖性能、热加工工艺探索和金相断口等方面进行了分析研究。二、钢材化学成分和实物解剖性能钢材的化学成分分析结果见表1。主连 I. Introduction Foreign high speed diesel engines are light in weight and high in power. They are still at an advantage in the international high speed diesel engine series since the 1960s. 18CrNiWA steel main link is the key moving parts of the aircraft. In order to improve the reliability of domestic high-speed diesel engines, Shanghai Jiaotong University and Henan Diesel Engine Works conducted researches on the main linkages (S-60), S-70s and CH-60 Steel composition analysis, physical anatomical properties, thermal processing technology and metallurgical fracture analysis and other aspects. Second, the chemical composition of steel and physical anatomy Steel chemical composition analysis results in Table 1. Main connection