Abstract Spheroidization heat treatment and intercritical annealing and their effects on the mechanical properties and corrosion behavior of CK45 medium carbon steel were studied. Increasing the spheroidization time resulted in the decline of strength and hardness of the initial martensitic steel but improved the tensile ductility and corrosion resistance. Intercritical annealing of the spheroidized steels resulted in the formation of austenite at the expense of cementite particles at short intercritical annealing times, which resulted in the development of dual phase (DP) steels after water quenching. Increasing the holding time at the intercritical annealing temperature led to a remarkable increase in the volume fraction of martensite in the microstructure, leading to poor ductility and corrosion resistance. This processing route, however, made it possible to obtain low martensite contents via short intercritical annealing of spheroidized steels, which resulted in the enhancement of strength-ductility balance while maintaining appropriate corrosion resistance.

中文翻译：

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球化热处理和临界区退火对中碳双相钢力学性能和耐蚀性的影响

摘要 研究了球化热处理和临界间退火对CK45中碳钢力学性能和腐蚀行为的影响。增加球化时间导致初始马氏体钢的强度和硬度下降，但提高了拉伸延展性和耐腐蚀性。球化钢的临界间退火导致奥氏体的形成，但在临界间退火时间较短时会以渗碳体颗粒为代价，这导致了水淬后双相 (DP) 钢的发展。增加临界间退火温度下的保温时间导致显微组织中马氏体的体积分数显着增加，导致延展性和耐腐蚀性较差。然而，这种加工路线，