对980钢进行了多次重复调质试验,对其力学性能和金相组织进行了测试和观察。结果表明,经过第一次调质,试样屈服强度、抗拉强度明显提高,低温冲击吸收能量无明显变化,显微组织为回火索氏体和残留奥氏体;经过第二次调质,屈服强度、抗拉强度无明显变化,低温冲击吸收能量明显提高,显微组织转变为回火索氏体,晶界变得明显,晶粒得到细化;经过第三次调质,屈服和抗拉强度无明显变化,低温冲击吸收能量略有降低,显微组织转变为回火索氏体和粒状珠光体。经过两次调质处理后,力学性能显著提高,效果最好。 The 980 steel was repeatedly repeated quenching test, its mechanical properties and microstructure were tested and observed. The results show that after the first quenching and tempering, the yield strength and tensile strength of the sample are obviously improved, the energy absorbed by the low temperature does not change obviously, the microstructure is tempered sorbite and retained austenite. After the second quenching and tempering , Yield strength, tensile strength no significant change, low temperature shock absorption energy increased significantly, the microstructure transformed into tempered sorbite, the grain boundaries become obvious, the grain was refined; after the third quenching, yielding and Tensile strength no significant change in low temperature impact energy absorption decreased slightly, the microstructure transformed into tempered sorbite and granular pearlite. After twice quenched and tempered, the mechanical properties significantly improved, the best.