激光功率对激光熔覆IN738LC合金耐磨性能的影响  

Effect of Laser Power on Wear Resistance of Laser Cladding IN738LC Alloy

作　　者：蒋武雄 伍文星 陈平虎[1] 阳彤 李会杰 邱长军[1] JIANG Wuxiong;WU Wenxing;CHEN Pinghu;YANG Tong;LI Huijie;QIU Changjun(Hunan Key Laboratory of Equipment Safety Service Technology in Supernormal Environment of Nanhua University,Hengyang 421001,China)

机构地区：[1]南华大学超常环境下装备安全服役技术湖南省重点实验室,湖南衡阳421001

出　　处：《材料保护》2024年第7期191-198,共8页Materials Protection

基　　金：国家自然科学基金(52371032);湖南省研究生科研创新项目(CX20230956)。

摘　　要：IN738LC合金是典型的γ’相沉淀强化型镍基高温合金,常用于燃气轮机和航空发动机等高温部件。为进一步提高其高温耐磨性,分别以4种激光功率在纯度为99.99%氮气环境下利用激光熔覆技术制备IN738合金试样,并进行850℃×24 h热处理。采用X射线衍射(XRD)、扫描电镜(SEM)、高温摩擦磨损试验机等仪器和JMatPro软件研究金相组织与性能。结果表明:随着激光功率的升高,未热处理试样硬度的均值由40.74 HRC缓慢上升到41.92 HRC,经热处理后试样的硬度均值为43 HRC左右。未热处理和热处理后的试样在常温下摩擦系数的均值分别为0.70,0.65,热处理后的试样在800℃高温下摩擦系数均值为0.35。在一定激光功率范围内,试样的耐磨性能随激光功率的升高先上升后下降,激光功率分别为750,650 W时制备的试样分别在常温、800℃高温耐磨性能最好,相同激光功率下制备的试样在800℃高温下的耐磨性能远优于常温下的耐磨性能。IN738LC alloy is a typicalγ’phase precipitation-strengthened nickel-based superalloy,commonly used in high-temperature components such as gas turbines and aero-engines.In order to further enhance its high-temperature wear resistance,IN738 alloy samples were prepared using laser cladding technology with four different laser powers in a 99.99%pure nitrogen environment,followed by heat treatment at 850℃for 24 h.The microstructure and properties were studied using X-ray diffraction(XRD),scanning electron microscopy(SEM),high-temperature friction and wear testing machines and JMatPro software.Results showed that with the increase in laser power,the mean hardness of the samples without heat treatment increased gradually from 40.74 HRC to 41.92 HRC,while the mean hardness of the samples after heat treatment was 43.0 HRC.The average friction coefficients of the samples without heat treatment and after heat treatment at normal temperature were 0.70 and 0.65,respectively.The average friction coefficient at 800℃of the samples after heat treatment was 0.35.The wear resistance of the samples first increased and then decreased with the increase in laser power within a certain range of laser power.The wear resistance of the samples prepared at room temperature and at 800℃was highest when the laser power was 750 W and 650 W,respectively.The wear resistance of samples prepared under the same laser power at a high temperature of 800℃was much better than that at room temperature.

关 键 词：IN738LC合金 激光熔覆 激光功率 摩擦磨损 

分 类 号：TG115[金属学及工艺—物理冶金]