工程科学学报，第39卷.第2期：244-250.2017年2月 Chinese Journal of Engineering,Vol.39,No.2:244-250,February 2017 DOI:10.13374/j.issn2095-9389.2017.02.012;http://journals.ustb.edu.cn 钇基稀土对E36钢板显微组织及冲击性能的影响 习小军12)，赖朝彬)四，李京社)，汪志刚，孙乐飞3》，陈英俊) 1)江西理工大学冶金与化学工程学院，赣州3410002)北京科技大学治金与生态工程学院，北京100083 3)新余钢铁集团有限公司，新余338001 ☒通信作者，E-mail:13807905115@126.com 摘要运用扫描电镜及能谱等分析手段研究了钇基稀土对36钢中夹杂物的变质作用以及对显微组织和冲击性能的影 响.研究表明，钇基稀土改善了E36钢的显微组织，减少了珠光体的片间距和含量.加入钇基稀土后，36钢的冲击断口由典 型的解理断口变为准解理+韧窝型断口，韧窝中细小球状的稀土夹杂是其转变的主要原因.加入少量的钇基稀土显著改善 了36钢的冲击韧性，尤其是低温冲击性能.在-60℃情况下，E36R钢的纵向冲击功较E36钢提高了33.5%，横向冲击功 提高了113.7%.并且，钇基稀土显著改善了36钢纵横向冲击性能的差异性.未加稀土36钢的纵、横冲击比均大于1.70， -60℃条件下达到2.77，而E36Re钢的纵、横冲击比为1.51-1.73. 关键词稀土；钢板；显微组织：冲击性能 分类号TG142.1 Effect of Y-base rare earth on the microstructure and impact toughness of E36 steel plate XI Xiao-jun LAI Chao-bin,LI Jing-she,WANG Zhi-gang,SUN Le-fe,CHEN Ying-jun 1)School of Metallurgy and Chemical Engineering,Jiangxi University of Science and Technology,Ganzhou 341000.China 2)School of Metallurgical and Ecologieal Engineering,University of Science and Technology Beijing,Beijing 100083.China 3)Xinyu Iron and Steel Group Co.,Ltd.,Xinyu 338001,China Corresponding author,E-mail:13807905115@126.com ABSTRACT The effect of Y-base rare earth on the inclusions modification,microstructure and impact toughness of E36 steel was in- vestigated by using scanning electron microscopy and energy spectrum analysis.The results indicate that Y-base rare earth improves the microstructure and reduces the interlamellar spacing and content of pearlite.The typical cleavage fracture of E36 steel is quasi- cleavage and dimple fracture when adding Y-base rare earth.Fine and spherical rare earth inclusions are the main reason for the frac- ture transformation.The impact toughness of E36 steel is improved obviously by Y-base rare earth,especially at the low temperature. In comparison with E36 steel without Y-base rare earth,the longitudinal impact energy of E36 steel containing Y-base rare earth is in- creased by 33.5%,and the transverse impact energy is increased by 113.7%at -60C.Moreover,the difference of longitudinal and transverse impact toughness is decreased by Y-base rare earth significantly.To E36 steel without Y-base rare earth,the proportion of longitudinal and transverse impact values is greater than 1.70 and it reaches 2.77 at-60C.And the proportion of longitudinal and transverse impact values is 1.51-1.73 for E36 steel plate containing Y-base rare earth. KEY WORDS rare earths;steel plate;microstructure;impact toughness 稀土作为一种重要的战略资源，对钢材综合性能 有显著的改善作用.近年来，随着稀土钢生产领域的 收稿日期：2016-04-20 基金项目：江西省高等学校科技落地计划资助项目(KLD13043):国家自然科学基金资助项目(51664021)工程科学学报,第 39 卷,第 2 期:244鄄鄄250,2017 年 2 月 Chinese Journal of Engineering, Vol. 39, No. 2: 244鄄鄄250, February 2017 DOI: 10. 13374 / j. issn2095鄄鄄9389. 2017. 02. 012; http: / / journals. ustb. edu. cn 钇基稀土对 E36 钢板显微组织及冲击性能的影响 习小军1,2) , 赖朝彬1) 苣 , 李京社2) , 汪志刚1) , 孙乐飞3) , 陈英俊3) 1) 江西理工大学冶金与化学工程学院, 赣州 341000 2) 北京科技大学冶金与生态工程学院, 北京 100083 3) 新余钢铁集团有限公司, 新余 338001 苣 通信作者, E鄄mail: 13807905115@ 126. com 摘 要 运用扫描电镜及能谱等分析手段研究了钇基稀土对 E36 钢中夹杂物的变质作用以及对显微组织和冲击性能的影 响. 研究表明,钇基稀土改善了 E36 钢的显微组织,减少了珠光体的片间距和含量. 加入钇基稀土后,E36 钢的冲击断口由典 型的解理断口变为准解理 + 韧窝型断口,韧窝中细小球状的稀土夹杂是其转变的主要原因. 加入少量的钇基稀土显著改善 了 E36 钢的冲击韧性,尤其是低温冲击性能. 在 - 60 益 情况下,E36Re 钢的纵向冲击功较 E36 钢提高了 33郾 5% ,横向冲击功 提高了 113郾 7% . 并且,钇基稀土显著改善了 E36 钢纵横向冲击性能的差异性,未加稀土 E36 钢的纵、横冲击比均大于 1郾 70, - 60 益条件下达到 2郾 77,而 E36Re 钢的纵、横冲击比为 1郾 51 ~ 1郾 73. 关键词 稀土; 钢板; 显微组织; 冲击性能 分类号 TG142郾 1 Effect of Y鄄base rare earth on the microstructure and impact toughness of E36 steel plate XI Xiao鄄jun 1,2) , LAI Chao鄄bin 1) 苣 , LI Jing鄄she 2) , WANG Zhi鄄gang 1) , SUN Le鄄fei 3) , CHEN Ying鄄jun 3) 1) School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China 2) School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China 3) Xinyu Iron and Steel Group Co. , Ltd. , Xinyu 338001, China 苣 Corresponding author, E鄄mail: 13807905115@ 126. com ABSTRACT The effect of Y鄄base rare earth on the inclusions modification, microstructure and impact toughness of E36 steel was in鄄 vestigated by using scanning electron microscopy and energy spectrum analysis. The results indicate that Y鄄base rare earth improves the microstructure and reduces the interlamellar spacing and content of pearlite. The typical cleavage fracture of E36 steel is quasi鄄 cleavage and dimple fracture when adding Y鄄base rare earth. Fine and spherical rare earth inclusions are the main reason for the frac鄄 ture transformation. The impact toughness of E36 steel is improved obviously by Y鄄base rare earth, especially at the low temperature. In comparison with E36 steel without Y鄄base rare earth, the longitudinal impact energy of E36 steel containing Y鄄base rare earth is in鄄 creased by 33郾 5% , and the transverse impact energy is increased by 113郾 7% at - 60 益 . Moreover, the difference of longitudinal and transverse impact toughness is decreased by Y鄄base rare earth significantly. To E36 steel without Y鄄base rare earth, the proportion of longitudinal and transverse impact values is greater than 1郾 70 and it reaches 2郾 77 at - 60 益 . And the proportion of longitudinal and transverse impact values is 1郾 51鄄鄄1郾 73 for E36 steel plate containing Y鄄base rare earth. KEY WORDS rare earths; steel plate; microstructure; impact toughness 收稿日期: 2016鄄鄄04鄄鄄20 基金项目: 江西省高等学校科技落地计划资助项目(KJLD13043); 国家自然科学基金资助项目(51664021) 稀土作为一种重要的战略资源,对钢材综合性能 有显著的改善作用. 近年来,随着稀土钢生产领域的