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Article:Laser surface hardening of 42CrMo cast steel for obtaining a wide and uniform hardened layer by shaped beams

 

题名:  Laser surface hardening of 42CrMo cast steel for obtaining a wide and uniform hardened layer by shaped beams
作者:  Sun PP(孙培培);  Li SX(李少霞);  Yu G(虞钢);  He XL(何秀丽);  Zheng CY(郑彩云);  Ning WJ(宁伟健)
通讯作者:  Sun, PP (reprint author), Basic Technol Res Ctr, AVIC Engine Estab, Beijing 100028, Peoples R China.
发表日期:  2014-2
关键词:  Laser surface hardening (LSH);  42CrMo cast steel;  Laser beam shaping;  Strip array spots
摘要:  For laser surface hardening (LSH) of large-sized workpieces, a wide and uniform hardened layer of a single track is pursued. In this study, two kinds of shaped laser beams were used in LSH of 42CrMo cast steel to obtain the required hardened layer. One is a stripy spot with uniform-intensity array spots and the other a stripy spot with intensity blowup in the edge of the whole array spots. As a comparison, a Gaussian laser beam was also adopted. A three-dimensional finite element model was used to simulate the thermal history of specific points by the latter shaped beam and the Gaussian laser beam. The surface morphology, microstructure, microhardness, and uniformity of hardened layers were studied. The results showed that a wider and more uniform hardened layer could be obtained using the latter shaped beam at relative higher scanning velocities and laser power. The thermal history of a material has an important effect on the microstructure and microhardness finally formed. Due to the high peak temperature and heating rate caused by the latter shaped beam, a higher value of microhardness in the transformation hardened zone was found.
通讯作者邮箱:  pipnus@yahoo.cn
原文网址:  http://dx.doi.org/10.1007/s00170-013-5292-3
刊名:  INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
收录类别:  SCI;  EI
URI标识:  http://dspace.imech.ac.cn/handle/311007/48798
产权排序:  [Sun, Peipei] Basic Technol Res Ctr, AVIC Engine Estab, Beijing 100028, Peoples R China; [Li, Shaoxia; Yu, Gang; He, Xiuli; Zheng, Caiyun; Ning, Weijian] Chinese Acad Sci, Inst Mech, Key Lab Mech Adv Mfg, Beijing 100190, Peoples R China
专题: 先进制造工艺力学重点实验室_期刊论文