摘要
利用金相显微镜OM、扫描电镜SEM、体视显微镜等试验手段,研究了时效时间对一种超高强度不锈钢硬度与冲击性能的影响。结果表明:随时效时间的增加,钢的硬度先上升后下降,其对应的是第二相沉淀强化机制由切过机制转变为Orowan绕过机制。第二相粒子的析出与长大在初期有利于提高钢的强度,后期则会降低钢的强度,且钢的冲击功不断降低,第二相粒子的粗化显著降低了钢的韧性。从节约能源、提高生产效率及综合力学性能的角度出发,最佳时效时间为4 h。
Effect of aging time on the hardness and impact toughness of one kind ultra-high strength stainless steel was studied by means of optical microscope,scanning electron microscope and stereomicroscope. The results showed that hardness increases with aging time expansion,corresponding to the change from cutting-mechanism to Orowan bowing mechanism. The precipitation and growth of second-phase particles at early stages of aging are beneficial to the strength of steel,prolonged time will result in lower strength as well as impact toughness due to the coarsening of second-phase particles. From point of view of energy saving,productivity improving and excellent combined mechanical properties,aging time of 4h was preferred
出处
《连铸》
2016年第3期75-78,共4页
Continuous Casting
关键词
时效时间
沉淀强化
硬度
冲击功
aging time
precipitation
hardess
impact toughness
