强流脉冲电子束对50BA钢显微形貌的影响  

Effects of High Current Pulsed Electron Beam on Microscopic Morphology of 50BA Steel

作　　者：罗天星[1,2] 周志明 宋小放[1] 黄伟九 汪红川[3] 罗荣[3] 曹敏敏 LUO Tianxing, ZHOU Zhiming1＇2＇3, SONG Xiaofang, HUANG Weijiu, WANG Hongchuan3, LUO Rong3, CAO Minmin3(1. School of Material Science and Engineering, Chongqing University of Technology, Chongqing 400054, China; 2. Key Laboratory of Research Center for Chongqing Mould Technology, Chongqing 400054, China; 3. Chongqing Jianshe Industry Refco Group Ltd., Chong qing 400054, Chin)

机构地区：[1]重庆理工大学材料科学与工程学院,重庆400054 [2]重庆市模具技术重点实验室,重庆400054 [3]重庆市建设工业集团有限责任公司,重庆400054

出　　处：《热加工工艺》2018年第4期141-143,共3页Hot Working Technology

基　　金：国家自然科学基金项目(51101177);重庆市科委攻关项目(2014yykf B60004);重庆市巴南区科研基金项目(2015TJ08);重庆市模具技术重点实验室开放基金项目(2015TD19)

摘　　要：采用不同脉冲次数的强流脉冲电子束（HCPEB）对50BA钢表面进行轰击处理,观察处理前后的试样形貌变化。结果表明：经强流脉冲电子束处理后,试样表面出现弥散分布“熔坑”和相变组织的改性层;随着脉冲次数的增加,熔坑尺寸先增大后变小,熔坑数量逐渐减少,熔坑深度逐渐变浅,试样表面逐渐趋于平滑,改性层的厚度逐渐增厚;相变产生的马氏体含量相对减少而残余奥氏体含量相对增加;快速凝固使试样表面层的晶粒细化,分布更为均匀。The ionic bombardment on 50BA steel surface was carried out by different pulse numbers of high currentpulsed electron beam （HCPEB）, and the changes of surface morphology of the samples before and after treatment wereobserved. The results show that after high current pulsed electron beam treatment, the sample surface generates dispersed＂crater＂ and modified layer of phase change microstructure. With the increase of the numbers of pulses, the size of craterincreases firsty and then becomes small. The number of craters gradually reduces and the depth gradually becomes shallow,the surface of the sample gradually tends to be smooth, and the thickness of the modified layer increases gradually. Thecontent of martensite produced by phase transformation relatively reduces while the content of retained austenite relativelyincreases. The rapid solidification makes the sample surface grain refine and the grains distribute more uniform.

关 键 词：50BA钢 强流脉冲电子束 表面改性 

分 类 号：TG113.1[金属学及工艺—物理冶金]