表面技术2016，Vol.45Issue(5)：169-174,6.DOI:10.16490/j.cnki.issn.1001-3660.2016.05.026
激光表面处理CuCr50合金的显微组织及性能
Microstructure and Properties of CuCr50 Processed by Laser Surface Treatment
摘要
Abstract
ABSTRACT:Objective To refine the Cr phase structure of CuCr50 and improve the uniformity of the microstructure.Me-thodsCuCr50 alloys were treated by Nd:YAG pulsed laser, and the microstructure (surface microstructure and cross-section mi-crostructure), phase, electrical conductivity, microhardness and wear resistance of the alloy were investigated and analyzed after the laser treatment.Results Experimental parameters of process optimization were: laser power 500 W, peak 5.0 kW, scanning speed 4 mm/s, laser frequency 6 Hz, laser pulsed width 5 ms, defocus amount +4 mm. Under the optimized process conditions, dense remelting layer was formed, the size of Cr particles was significantly reduced, the structural homogeneity was improved, the hole was reduced after treatment; The phase composition of the remelting layer were not changed, the electrical conductivity was slightly decreased, but the remelting layer still maintained an excellent conductive performance; Microhardness of the re-melting layer(425~540HV) was obviously improved, the maximum reached 540HV, which was 2.25 times of the substrate (about 240HV). The friction coefficient of the remelting layer (0.3) was much lower than the original CuCr50 alloys (0.45), the weight lost of remelting layer (0.15 mg) was much lower than the original CuCr50 alloys (0.6 mg), and the wear resistance of the alloy had an obvious improvement.ConclusionCuCr50 alloy could be refined, the microhardness and wear resistance could be improved by laser surface treatment under the condition of optimized process parameters.关键词
CuCr50合金/激光/组织/导电性/显微硬度/耐磨性Key words
CuCr50 alloy/laser/microstructure/electrical conductivity/microhardness/wear resistance分类
化学化工引用本文复制引用
刘杰,周志明,涂坚,黄灿,柴林江,黄伟九,王亚平..激光表面处理CuCr50合金的显微组织及性能[J].表面技术,2016,45(5):169-174,6.基金项目
国家自然科学基金（51101177）；重庆市自然科学基金（cstc201250035）；重庆市科委攻关项目（cstc2014yykfB60004）；重庆市巴南区科技项目（2015TJ08）；重庆市模具技术重点实验室开放基金（2015TD19）FundSupported by the National Natural Science Foundation of China（51101177）, the Natural Science Foundation of Chongqing （cstc201250035）, Chongqing Science and Technology Committe（cstc2014yykfB60004）, Science and Technology Project of Banan District, Chongqing（2015TJ08）and Open Foundation of Chongqing Research Center for Mould Engineering Technology （）
