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针对CSP工艺生产的30CrMo热轧带钢,研究了淬火温度、保温时间、淬火介质对其组织和力学性能的影响。研究结果表明:淬火温度为860~1000℃,保温时间为5~60 min时,30CrMo钢经水淬和油淬后得到的均为马氏体组织,但不同工艺条件下马氏体的类型、尺寸和力学性能不同。当淬火温度较低时,基体中的马氏体组织由细小的片状马氏体和板条马氏体组成,强度和硬度较高。随着淬火温度的升高以及保温时间的延长,片状马氏体的含量逐渐减少,板条马氏体的含量不断增加,尺寸增大,强度和硬度值下降。其中,试验钢在不同淬火工艺下经油淬后的屈服强度可用σs=-4050.4+16272.2d-1/2来表示,理论计算结果与实验测量结果相吻合。试验钢的最佳淬火工艺为880℃、保温15 min、油淬,其抗拉强度、屈服强度、洛氏硬度、断后伸长率分别为1809 MPa、1206 MPa、52.54 HRC、8.5%。
Aiming at the hot rolled strip of 30CrMo produced by CSP process, the effects of quenching temperature, holding time and quenching medium on the microstructure and mechanical properties were studied. The results show that when the quenching temperature is 860 ~ 1000 ℃ and the holding time is 5 ~ 60 min, the martensitic structure of 30CrMo steel is obtained after water quenching and oil quenching. However, the types and sizes of martensite under different process conditions And different mechanical properties. When the quenching temperature is low, the martensite in the matrix consists of fine lamellar martensite and lath martensite with high strength and hardness. With the increase of quenching temperature and holding time, the content of lamellar martensite gradually decreases, the content of lath martensite increases, the size increases, and the strength and hardness decrease. Among them, the yield strength of the test steel after oil quenching under different quenching process can be expressed as σs = -4050.4 + 16272.2d-1/2, and the theoretical calculation results are in good agreement with the experimental measurement results. The best quenching process of the test steel is 880 ℃, holding time is 15 min, the tensile strength, yield strength, Rockwell hardness and elongation at break are 1809 MPa, 1206 MPa, 52.54 HRC and 8.5% respectively.