K418合金表面激光再制造Inconel718高温合金涂层性能研究  

Properties of Inconel 718 Superalloy Coating on K418 Alloy Surface for Laser Remanufacture

作　　者：任维彬 周金宇[1] 董世运[2] 徐滨士[2] 闫世兴 陈国炎[1] Ren Weibin;Zhou Jinyu;Dong Shiyun;Xu Binshi;Yan Shixing;Chen Guoyan(Changzhou Key Laboratory for Remanufacturing,Jiangsu University of Technology,Changzhou 213001,China;National Key Laboratory for Remanufacturing,Academy of Armored Forces Engineering,Beijing 100072,China)

机构地区：[1]江苏理工学院常州市装备再制造工程重点实验室,江苏常州213001 [2]陆军装甲兵学院装备再制造技术国防科技重点实验室,北京100072

出　　处：《稀有金属材料与工程》2020年第1期274-280,共7页Rare Metal Materials and Engineering

基　　金：常州市科技计划(CJ20180058);常州市装备再制造工程重点实验室开放基金(CRM2018A02)。

摘　　要：针对K418高温合金叶轮高温、高转数工况下形变超差大,再制造成形层力学性能降低的领域研究热点,基于波形可调制脉冲激光优化工艺,再制造Inconel718高温合金成形层。采用金相显微镜、SEM、XRD、EDS、显微硬度计对该合金涂层的显微组织形貌、相结构、界面成分分布、基本力学性能进行研究。结果表明:涂层与基体间为致密的冶金结合,涂层中部为粗大的树枝晶,与激光扫描方面成30o^45o角,由涂层中部到顶部及底部,分别退化为等轴晶和胞状晶;成形层显微硬度为4100~4400 MPa,略高于基体;晶内及晶间析出少量Laves相,减少了对成形层硬脆性的影响;摩擦磨损系数较基体略有降低,但仍符合再制造要求。For the high temperature and high rotational speed working conditions of K418 superalloy impeller,the problems of deformation out of tolerance and reduction of mechanical properties after remanufacture for layer become the research focus.Based on the optimized process of waveform modulation pulsed laser,the Inconel 718 alloy layer was remanufactured.The metallographic microscope,SEM,XRD,EDS,microhardness,and dynamic balance testing machine were used to research the microstructure morphology,phase structure,interface composition distribution,basic mechanical properties of Inconel 718 layer.The results show that there is metallurgical bonding between the cladding layer and the substrate.Coarse dendrites exist in the middle layer,and there is a 30~45°angle between the coarse dendrite and the laser scanning direction.From the middle of the forming layer to the top and to the bottom,the coarse dendrite degenerates into equiaxed and cellular crystals,respectively.The microhardness of the forming layer is 4100~4400 MPa,which is slightly higher than that of the substrate.A small amount of Laves phase are precipitated in the grains and intergranular,which reduce the impact on the hard-brittleness of the forming layer,the friction and wear coefficient is slightly lower than that of the matrix,but the requirements of remanufacture is still met.

关 键 词：INCONEL718合金 K418合金 激光再制造 涂层性能 

分 类 号：TN249[电子电信—物理电子学] TG146.15[一般工业技术—材料科学与工程]