With the increase of service demand in medium and low temperature extreme environment,the high stability of shape and size of the Invar alloy precision devices will further show its unique value.The laser additive manufacturing technology of Invar alloy is expected to solve the bottleneck of high quality manufacturing of complex structure precision devices for low temperature and medium temperature.The research progress of laser additive manufacturing of Invar alloy at home and abroad is summarized in a comb,including defects types and the mechanism of defect formation,microstructure evolution,the effect of preparation technology on thermal expansion and mechanical properties of molded components.Laser additive technology has successfully realized the preparation of high density Invar alloy samples within a wide range of process parameters,and the samples have mechanical properties and thermal expansion properties that are no less than those of as-cast components,and finally summarizes the relevant research status of the preparation of Invar alloy composites using laser additive manufacturing technology.The development direction of laser additive manufacturing technology of Invar alloy is also prospected.
关键词
殷瓦合金/激光增材制造/缺陷/显微组织/热膨胀系数/力学性能
Key words
invar alloy/laser additive manufacturing/defects/microstructure/coefficient of thermal expansion/mechanical properties
维普
万方数据