Nb合金化对高Cr铸铁轧辊组织的影响  

Effect of Nb alloying on microstructure of high-Cr cast iron rolls

作　　者：王锡灶 张博涵 李浩楠 刘杰兵 乔桂英[2,3] 肖福仁[1,2] WANG Xi-zao;ZHANG Bo-han;LI Hao-nan;LIU Jie-bing;QIAO Gui-ying;XIAO Fu-ren(Key Lab of Metastable Materials Science and Technology and Hebei Key Lab for Optimizing Metal Product Technology and Performance,College of Materials Science and Engineering,Yanshan University,Qinhuangdao 066004,Hebei,China;Hebei Key Lab for Optimizing Metal Product Technology and Performance,College of Materials Science and Engineering,Yanshan University,Qinhuangdao 066004,Hebei,China;Key Lab of Applied Chemistry of Hebei Province,School of Environment and Chemical Engineering,Yanshan University,Qinhuangdao 066004,Hebei,China;Hebei Technology Innovation Centre for Roller Green Manufacturing,Xingtai Delong Machinery and Mill Roll Co.,Ltd.,Xingtai 054009,Hebei,China)

机构地区：[1]燕山大学材料科学与工程学院亚稳材料科学与制备技术国家重点实验室,河北秦皇岛066004 [2]燕山大学材料科学与工程学院河北省金属产品工艺与性能优化重点实验室,河北秦皇岛066004 [3]燕山大学环境与化学工程学院河北省应用化学重点实验室,河北秦皇岛066004 [4]邢台德龙机械轧辊有限公司河北省轧辊绿色制造技术创新中心,河北邢台054009

出　　处：《中国冶金》2022年第2期60-66,91,共8页China Metallurgy

基　　金：国家自然科学基金资助项目(51971198);河北省自然科学基金高端钢铁冶金联合研究基金资助项目(E2019203381)。

摘　　要：微合金化是细化高Cr铸铁轧辊的凝固组织、提高轧辊的性能和使用寿命重要手段。研究了Nb微合金化对高Cr铸铁轧辊组织和硬度的影响,并采用Thermo-Calc软件分析了Nb对高Cr铸铁凝固组织的细化机制,结果表明,Nb合金化能够显著细化高Cr铸铁的轧辊的凝固组织,提高轧辊的硬度。Nb微合金化对高Cr铸铁的组织改善作用取决于MC型碳化物析出温度及其对奥氏体和共晶M_(7)C_(3)碳化物的形核的促进作用。当Nb质量分数为0.5%时,高Cr铸铁轧辊硬度最大;进一步提高Nb含量能显著细化高Cr铸铁轧辊组织,但使硬度降低。Microalloying is an important method to refine the solidification microstructure and improve the mechanical properties and service life of high-Cr cast iron rolls.The effect of Nb microalloying on the microstructure and hardness of high-Cr cast iron was studied.Meanwhile,the refining mechanism of Nb on the solidification microstructure of high-Cr cast iron was analyzed by Thermo-Calc software.The results show that Nb microalloying can significantly refine the solidification microstructure and improve the hardness of high-Cr cast iron rolls.The improving of Nb microalloying on microstructure of high-Cr cast iron depends on the precipitation temperature of MC type carbide and its promotion of nucleation for austenite and eutectic M_(7)C_(3)carbides.As Nb mass fration is 0.5%,the hardness of high-Cr cast iron rolls is the highest.Further increase of Nb content can significantly refine the microstructure of high-Cr cast iron rolls,but reduce the hardness.

关 键 词：轧辊 高铬铸铁 铌合金化 组织 硬度 

分 类 号：TG333.17[金属学及工艺—金属压力加工]