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采用场发射扫描电镜、X射线衍射仪等设备研究了淬火终冷温度对直接淬火配分超高强钢组织与力学性能的影响规律。结果表明,随淬火终冷温度升高,抗拉强度先下降后升高,屈服强度则不断降低,冲击吸收能量和伸长率先增加后降低。直接淬火配分钢的组织由初生马氏体、新生马氏体和残留奥氏体构成。随淬火终冷温度升高,残留奥氏体含量先增加后降低,淬火冷却到260℃时残留奥氏体含量最高,为16%,试验钢具有最好的综合力学性能,抗拉强度超过1533 MPa,伸长率为16%,-20℃冲击吸收能量为26 J。淬火冷却到300℃,组织中出现了尺寸较大的块状新生马氏体,导致塑性和韧性降低。
Field emission scanning electron microscopy, X-ray diffraction and other equipment were used to study the effect of quenching and finishing temperature on the microstructure and mechanical properties of direct quenched fractionally hardened steel. The results show that with the increase of quenching temperature, the tensile strength first decreases and then increases, while the yield strength decreases continuously. The impact energy and elongation increase first and then decrease. Direct quenching with the division of steel by the organization of fresh martensite, fresh martensite and retained austenite. With the increase of quenching temperature, the content of retained austenite firstly increases and then decreases, and the content of retained austenite is the highest at 16% when quenched and cooled to 260 ℃. The test steel has the best comprehensive mechanical properties and the tensile strength exceeds 1533 MPa, an elongation of 16%, and an impact energy absorption of 26 ° C at -20 ° C. Quenching cooled to 300 ℃, the organization appeared in the larger block massive fresh martensite, resulting in plasticity and toughness decreased.