The failure analyses were conducted on a diesel engine crankshaft made of ductile cast iron, which was nitrided.The fracture occurred at the web between the 1st crankpin and 2nd journal.

• 摘要柴油机氮化球铁曲轴在服役过程中发生了断裂，断裂发生在第一曲拐与第二主轴颈之间的曲柄处。