回火温度对冶金锯片用钢8CrV组织及性能的影响
Effect of Tempering Temperature on Microstructure and Mechanical Properties of 8CrV Saw Blade for Metallurgy
苑少强1, 郭继富2, 韩会杰2, 梁国俐1
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作者单位：1. 唐山学院 科研处, 河北 唐山 063000; 2. 唐山冶金锯片有限公司, 河北 唐山 063020)
中文关键字：8CrV； 回火组织； 力学性能
英文关键字：8CrV; tempering microstructure; mechanical properties
中文摘要：采用金相观察、力学性能测试等手段，对经300～460 ℃连续回火处理的冶金锯片用钢8CrV的组织和性能进行分析。结果显示：随回火温度的升高，其组织由淬火马氏体逐渐转化为回火马氏体、回火马氏体+回火索氏体及回火索氏体；试样的强度连续下降，屈强比略有上升。在420 ℃左右出现了回火脆性，冲击值、断面收缩率和伸长率发生明显变化，而硬度略有升高。
英文摘要：The continuously tempering at 300～460 ℃for saw blade made of 8CrV steel was carried out. The microstructure and mechanical properties of 8CrV steel were analyzed using metallographic observation and mechanical measurement. The results show that: with the increase of tempered temperature, the quenched martensite transforms into the tempered martensite, tempered martensite+tempered sorbite and tempered sorbite; the strength of samples decreases continuously but yield ratio increases a little. At about 420 ℃, the temper brittleness occurs and obvious properties change happens of the samples, such as impact value, reduction area and elongation. However, the hardness values enhance at this temperature.