作　　者： ; ; ; ;

机构地区： 东北大学材料与冶金学院轧制技术及连轧自动化国家重点实验室

出　　处： 《金属热处理》 2009年第7期46-49,共4页

摘　　要： 通过显微组织观察和力学性能测定,研究了正火温度对低碳铌钒微合金钢Z向性能的影响。结果表明,正火不能消除MnS夹杂;850～925℃正火后,可以改善钢板的带状组织,减轻应力集中,降低裂纹萌生倾向,组织细化可有效阻碍裂纹扩展,提高钢板的Z向性能;950℃正火后,晶粒粗化且存在带状组织,抗裂纹扩展能力降低,从而使其Z向性能急剧恶化。采用875℃正火可以保证低碳铌钒微合金钢具有最佳的强韧性和Z向性能匹配。 Effects of normalization temperature on Z-direction properties of low carbon microalloyed steel bearing Nb and V were investigated with observation of the microstructure and test of mechanical properties. The results show that MnS inclusions still exist in steel after normalization. Through norulalizing from 850 ℃ to 925 ℃ , the banded structures can be improved, which reduces stress concentration and decreases the crack initiation trend. The microstructure is refined, which prevents effectively the cracking from propagation so as to improve Z-direction property. The grains are coarsened and the banded structures appear after normalization at 950 ℃ ,which decreases the resistance to crack propagation so that the Z-direction property is deteriorated. To adopt 875 ℃ normalization can assure the optimum match of strength, toughness and the Z-direction properties of the steel.

关 键 词： 正火 低碳微合金钢 向性能 层状撕裂

领　　域： [金属学及工艺] [金属学及工艺]