电焊机2018，Vol.48Issue(1)：80-85,6.DOI:10.7512/j.issn.1001-2303.2018.01.18
激光重熔镍铝青铜组织、腐蚀及空蚀行为研究
Microstructure, corrosion and cavitation erosion behavior of laser surface melted nickel aluminum bronze
摘要
Abstract
Nickel aluminum bronze (NAB) is one of the main materials used for making ship propellers.Large ship propellers are generally castings.The coarse and inhomogeneous microstructure of the cast NAB will reduce the lifetime of the ship propellers.In present study,laser surface melting(LSM) is applied to modify the cast microstructure.The results show that the LSM significantly refines the cast microstructure.The melting zone contains fine columnar grains,and the major axis of the columnar grains is perpendicular to the interface of the molten pool The heat affected zone (HAZ) consists of coarse isometric and columnar grains.The hardness of the LSM NAB can reach 285～325 HV,which is increased by 50％～70％ comparing with the hardness of the cast one.The electrochemical measurement results show that the LSM NAB and cast NAB experience similar electrode reaction processes in 3.5％ NaCl solution.However,comparing with the cast NAB,the cathode process of the LSM NAB is slower and therefore the corrosion rate is slower.The uhrasonic vibration cavitation erosion test results show that the erosion rate of the LSM NAB is only 60％ of that of the cast one because of the increased hardness and refined microstructure.For LSM NAB,the damaged surface is much evener,and no large cavitation erosion pit is found.And the effect of LSM parameters on the microstructure,corrosion and cavitation erosion behavior is also discussed.关键词
镍铝青铜/激光重熔/腐蚀/空蚀Key words
nickel aluminum bronze/laser surface melting/corrosion/cavitation erosion分类
矿业与冶金引用本文复制引用
宋亓宁,张磊,温家宝,王武港,顾伟,许楠,包晔峰..激光重熔镍铝青铜组织、腐蚀及空蚀行为研究[J].电焊机,2018,48(1):80-85,6.基金项目
国家自然科学青年基金(51601058) （51601058）
中央高校基础业务费(2015B30314) （2015B30314）
