厚规格耐磨钢辊式淬火组织性能分析  

Analysis of microstructure and mechanical properties of roller quenched thick wear-resistant steel

作　　者：曳彦奇 付天亮[1] 吴昊 王昭东[1] YE Yan-qi;FU Tian-liang;WU Hao;WANG Zhao-dong(State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819

出　　处：《材料热处理学报》2022年第5期143-150,共8页Transactions of Materials and Heat Treatment

摘　　要：通过力学性能测试、显微组织分析、显微硬度测量、偏析带及夹杂物成分分析和断口形貌观察,探讨了80 mm厚NM400钢组织性能的影响因素。结果表明:钢板内部存在含有TiC夹杂物的Mn偏析带,由表面至心部数量逐步增多,宽度逐渐增大,其硬度为592 HV0.3,高于基体中马氏体硬度497 HV0.3。偏析带的存在使得样品伸长率由10.2%降低至4.4%,-40℃冲击吸收能量由24 J降低至10 J。在硬度检测时,随着偏析带在检测位置占比的提高,心部硬度逐渐上升。因此连铸阶段充分改善特厚板坯中心偏析是保障厚规格耐磨钢辊式淬火组织性能合格的关键因素。The influence factors of microstructure and properties of 80 mm thick NM400 steel were discussed through mechanical property test, microstructure analysis, microhardness measurement, segregation zones and inclusion composition analysis and fracture surface observation. The results show that there are Mn segregation zones containing TiC inclusions in the steel plate, the number and width of the Mn segregation zones gradually increase from the surface to the center, and its hardness is 592 HV0.3, higher than the martensite hardness of 497 HV0.3 in the matrix. The existence of the segregation zones reduces the elongation of the sample from 10.2% to 4.4%, and the impact absorbed energy at-40 ℃ from 24 J to 10 J. In the hardness testing, with the increase of the proportion of segregation zones in the testing position, the central hardness increases gradually. Therefore, fully improving the central segregation of extra-thick slab in continuous casting stage is the key factor to ensure the qualified microstructure and properties of roll quenching of thick wear-resistant steel.

关 键 词：NM400钢 特厚板 辊式淬火 中心偏析 组织性能 

分 类 号：TG142.7[一般工业技术—材料科学与工程]