摘要
研究了循环热处理对Ti-V微合金钢组织和力学性能的影响。根据显微组织观察结果对各个循环次数的试验钢晶粒尺寸进行统计和计算,并结合SEM二次电子像揭示了试验钢在循环热处理过程中的组织演变规律,进而解释了晶粒细化机制;对试验钢进行TEM实验,观察了沉淀相粒子的尺寸、成分随循环次数的变化规律。并对不同循环次数下的试验钢进行了室温抗拉强度和冲击韧性实验。结果表明,Ti-V微合金钢的平均晶粒尺寸随着循环次数的增加持续减小(至第7次循环);受复杂碳化物平均尺寸的影响,抗拉强度Rm随着循环次数的增加逐渐降低(自第1次循环开始);而冲击吸收功AKU则因平均晶粒尺寸和先共析铁素体比例的共同影响,随循环次数的增加先升高后降低,并在第3次循环时达到最大。
Effect of cyclic heat treatment on microstructure and mechanical properties of a Ti-V microalloyed steel was investigated. Therefore, the metallographic microstructure of the steels after heat treatment for each cycle was succesively examined and the relevant grain size was statistically determined; the cyclically heat-treated steels were also examined by means of SEM and TEM in order to reveal the microstructural evolution and the variations of average size and composition of precipitates in the steels with the increasing cycle number; while their tensile strength and toughness were measured.The results show that with the increasing cycle number, the average grain size of the steels decreases continuously. For mechanical properties, Rmhas the same regularity due to the increase of mean size of the complex carbide with cycle numbers, while the AKUinitially increases and thereafter decreases as a result of the joint influence of the average grain size and the proportion of proeutectoid ferrite.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2015年第3期227-234,共8页
Chinese Journal of Materials Research
关键词
金属材料
循环热处理
Ti-V微合金钢
晶粒细化
复杂碳化物
力学性能
metallic materials,cyclic heat treatment,Ti-V microalloyed steel,grain refinement,complex carbides,mechanical properties
