稀土对B级钢组织和低温韧性的影响  

Effect of RE on the Microstructure and Low-temperature Impact of the Grade B Steel

作　　者：王凯锋 张淼 王雷[3] 冯义成[3] 郭二军[3] WANG Kaifeng;ZHANG Miao;WANG Lei;FENG Yicheng;GUO Erjun(AECC Harbin Dong＇an Engine Co.Ltd.,Harbin 150066,China;AVIC Harbin Aircraft Industry Group Co.,Ltd.,Harbin 150066,China;School of Material Science and Engineering,Harbin University of Science and Technology,Harbin 150040,China)

机构地区：[1]中国航发哈尔滨东安发动机有限公司,黑龙江哈尔滨150066 [2]航空工业哈尔滨飞机工业集团有限责任公司,黑龙江哈尔滨150066 [3]哈尔滨理工大学材料科学与工程学院,黑龙江哈尔滨150040

出　　处：《铸造技术》2018年第9期1911-1915,共5页Foundry Technology

摘　　要：研究不同稀土含量对摇枕、侧架用B级钢组织和低温韧性的影响,并在相同的热处理条件下,与不加稀土的实验钢进行对比。结果表明,稀土可以细化钢组织,在稀土含量低于0.3%时,随着稀土含量增加,实验钢组织细化效果增强,当稀土含量高于0.3%时,细化组织效果减弱,组织不均匀性增强;随着稀土含量增加,实验钢中夹杂物形态改善、数量明显减少;与未加入稀土实验钢相比,加入稀土后实验钢-60℃冲击吸收功提高,当稀土含量不高于0.3%时,随着稀土含量增加,-60℃冲击吸收功增加,当稀土含量高于0.3%时,-60℃冲击吸收功降低。The influence mechanism of RE content on the microstructure and impact at low temperature of the bolster and side frame with grade B steel was studied and compared with the tested steel without RE under the same heat treatment condition. The results show that RE element can refine the microstructure. When RE content is below 0.3%, the refinement effect of microstructure of test steel is enhanced with RE content increasing. When RE content is higher than 0.3%, the refinement effect is abated and the microstructure becomes more inhomogeneous; With RE content increasing, the form of inclusions is refined and the number of inclusions is significantly reduced; The impact absorption function at -60℃ of the test steel which added RE is improved compared with the tested steel without RE. When RE content is not higher than 0.3%, the impact absorption energy at -60℃ is increased with RE content increasing and it is decreased when the content of RE is higher than 0.3%.

关 键 词：稀土 细化组织 夹杂物 低温韧性 B级钢 

分 类 号：TG113[金属学及工艺—物理冶金]