混合稀土La、Ce对铸造高锰钢组织及夹杂物变性的影响  

Effect of Mixed Rare Earth La,Ce on the Microstructure and Inclusion Modification of Cast High Manganese Steel

作　　者：石帅 赵燕青 高云哲 王娇娇 武晓龙 弓俊杰 赵林林 郭瑞华 赵楠 SHI Shuai;ZHAO Yan-qing;GAO Yun-zhe;WANG Jiao-jiao;WU Xiao-long;GONG Jun-jie;ZHAO Lin-lin;GUO Rui-hua;ZHAO Nan(Material Technology Research Institute of HBIS Group,Shijiazhuang 050023,Hebei,China;Hebei HBIS Material Technology Research Institute Co.,Ltd.,Shijiazhuang 050023,Hebei,China)

机构地区：[1]河钢材料技术研究院,河北石家庄050023 [2]河北河钢材料技术研究院有限公司,河北石家庄050023

出　　处：《铸造》2024年第5期653-659,共7页Foundry

摘　　要：采用微量稀土La-Ce微合金化对高锰铸钢进行变质处理,借助金相显微镜、扫描电镜、能谱仪、冲击试验机、显微硬度计等检测手段,研究了La-Ce混合稀土对铸造高锰钢显微组织、夹杂物和力学性能影响。结果表明:微量的稀土La-Ce使高锰钢铸态组织柱状晶区缩短,等轴晶区扩大,二次枝晶间距减小,晶界碳化物细化;同时钢中夹杂物变性,由原来多边形的Ti N、Al_(2)O_(3)与Mn S复合夹杂转变为椭球状或球状的含稀土复合夹杂。稀土La-Ce改善了铸态高锰钢的冲击韧性及显微硬度,在0℃、-20℃、-40℃试验温度下横向冲击功分别提升32.3%、67.5%,170.0%,低温韧性提升更加显著;显微硬度HV10由221提升至238。The effect of La-Ce mixed rare earth elements on the microstructure,inclusions,and mechanical properties of cast high manganese steel was studied by using trace rare earth La-Ce microalloyed high manganese cast steel for modification treatment,and detection methods such as metallographic microscope,scanning electron microscope,energy dispersive spectrometer,impact testing machine,and microhardness tester.The results show that a trace amount of rare earth La-Ce shortens the columnar crystal zone,expands the equiaxed crystal zone,reduces the secondary dendrite spacing,and refines the grain boundary carbides in the as-cast structure of high manganese steel.At the same time,the inclusions in the steel undergo denaturation,transforming from polygonal TiN,Al_(2)O_(3),and MnS composite inclusions into ellipsoidal or spherical rare earth containing composite inclusions.Rare earth La-Ce improves the impact toughness and microhardness of as cast high manganese steel.The transverse impact energy increases by 32.3%,67.5%,and 170.0%respectively at 0℃,-20℃,and-40℃test temperatures,and the low-temperature toughness improvement is more significant.The microhardness HV10 has been increased from 221 to 238.

关 键 词：高锰钢 稀土 夹杂物 冲击功 

分 类 号：TG142[一般工业技术—材料科学与工程]