Research On Laser Remanufacturing Process Of Nickel-based Super-alloy And Their High-temperature Tensile Properties

Re-manufacturing engineering emerges with the advocacy of sustainable development. It can save a great deal of cost and can improve resources utilization, on the basis of high quality, high efficiency, environmental protection, energy saving and material saving. Laser remanufacturing technology is based on the remanufacturing engineering and laser rapid prototyping technology, which has been widely used in the aerospace, large machinery and equipment, chemical oil, and so on. In this paper, the laser remanufacturing technology is used in the remanufacturing of aviation materials. The working pieces of nickel-based super-alloy GH4169 processed by laser remanufacturing are analyzed in principle analysis, process, property. The concrete research content is illustrated as follows:(1)The relevant mechanism of laser remanufacturing technology is studied, including the interaction mechanism between material and laser, molten pool convection forming, internal analysis of the nucleation and nucleus growth process in molten pool.(2) Based on response surface method, the paper studies the laser power, scanning speed of single-channel cladding layer morphology characteristics. Process parameters are optimized based on the dilution rate and the contact Angle. And it finally gets 7 group of optimization parameters.(3) Using the 7 groups of process parameters for the remanufacturing test, the failure parts were repaired with the appropriate scanning path, overlapping rate. This paper studies influence on microstructure by laser power and scanning speed, as well as the precipitated phase in the repaired zone.(4) The high temperature tensile properties of remanufacturing parts are analyzed, according to the parts in the working condition. The seven groups of remanufacturing are analyzed from the tensile strength, yield strength, break elongation, cross section shape. It can be found that No.1 remanufacturing parts is best with yield strength surpassed more than 4.3% of nondestructive. From the perspective of practical using of parts, parts remanufacturing performance has exceeded the nondestructive ones, achieving the goal of the remanufacturing.