钇基稀土对高强船板钢夹杂物及低温冲击性能的影响  

Effect of yttrium-based rare earth on inclusions and cryogenic temperature impact property of high strength shipbuilding steel

作　　者：罗迪强[1] 余音宏[1] 张真铭[1] 冯小明 刘敏[1,2] 赖朝彬 Luo Diqiang;Yu Yinhong;Zhang Zhenming;Feng Xiaoming;Liu Min;Lai Chaobin(Faculty of Materials Metallurgy and Chemistry,Jiangxi University of Science and Technology,Ganzhou Jiangxi 341000,China;Xinyu Iron&Steel Group Co.,Ltd.,Xinyu Jiangxi 338001,China)

机构地区：[1]江西理工大学材料冶金化学学部,江西赣州341000 [2]新余钢铁股份有限公司,江西新余338001

出　　处：《金属热处理》2022年第3期142-146,共5页Heat Treatment of Metals

基　　金：国家自然科学基金(51664021,51974139);江西省重大科技研发专项(20194ABC28011)。

摘　　要：采用扫描电镜(SEM)和能谱仪(EDS)等分析方法,研究了钇基稀土含量对EH36高强船板钢夹杂物和低温冲击性能的影响。结果表明,EH36钢中添加适量稀土能够显著提高钢材的低温冲击性能。钢中稀土含量为0.018%(质量分数)时,-40℃横向冲击性能提高了59.4%,-60℃横向冲击性能提高了65.7%。低温冲击断口形貌由无稀土钢样的解理断面转变为韧窝断口,韧窝底部的细小球状稀土复合夹杂物对裂纹扩展起到缓冲作用,阻碍了裂纹的扩展。同时,稀土可以将EH36钢中长条状Al_(2)O_(3)-CaO-MnS夹杂物变质为细小的类球状稀土夹杂物,夹杂物粒径从约5μm细化到3μm以内。Effect of yttrium-based rare earth content on inclusions and cryogenic temperature impact property of the EH36 high strength shipbuilding steel was studied by means of scanning electron microscope and energy dispersive spectroscopy.The results show that the addition of proper amount of rare earth can significantly improve the low temperature impact property of the EH36 steel.When the rare earth content in the steel is 0.018%(mass fraction),the transverse impact property at -40℃ and -60℃ are increased by 59.4% and 65.7%,respectively.After the rare earth is added,the low temperature impact fracture morphology changes from the cleavage type without rare earth to the dimple fracture,and the small spherical rare earth composite inclusions at the bottom of the dimple buffers and hinders the crack growth.Meanwhile,the rare earth can modify long strip-like Al_(2)O_(3)-CaO-MnS inclusions in the EH36 steel into fine spherical rare earth inclusions,and the particle size of inclusions is refined from about 5μm to less than 3μm.

关 键 词：高强船板钢 钇基稀土 夹杂物 低温冲击性能 

分 类 号：TG142.12[一般工业技术—材料科学与工程]