DD9镍基单晶高温合金的缓进给磨削烧伤实验  

Experimental study on creep-feed grinding burn of DD9 Nickel-based single crystal superalloy

作　　者：康恺煜 余广渊 杨万鹏 董建民[2] 蒋睿嵩 KANG Kaiyu;YU Guangyuan;YANG Wanpeng;DONG Jianmin;JIANG Ruisong(School of Aeronautics and Astronautics,Sichuan University,Chengdu 610065,China;The Key Laboratory of Advanced High Temperature Structural Materials,Beijing Institute of Aeronautical Materials,Beijing 100095,China;School of Mechanical Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学空天科学与工程学院,成都610065 [2]北京航空材料研究院,先进高温结构材料国防科技重点实验室,北京100095 [3]四川大学机械工程学院,成都610065

出　　处：《金刚石与磨料磨具工程》2023年第3期355-363,共9页Diamond & Abrasives Engineering

基　　金：国家科技重大专项(2017-VI-0001-0070);四川省科技计划(2021YFG0049,2021ZHCG0009)。

摘　　要：针对第三代单晶高温合金DD9磨削烧伤问题,设计三因素五水平实验,从表面形貌、显微硬度和显微组织等角度出发,研究磨削工艺参数对烧伤的影响规律。结果表明:当工件进给速度小于等于250 mm/min时,磨削表面粗糙度Ra在0.8μm左右小幅度变化,表面质量较好;当工件进给速度大于250 mm/min,磨削深度超过1.0 mm后,磨削区域温度急剧上升,磨削纹路被破坏,出现涂覆、凹坑等磨削缺陷,工件表面发生烧伤;DD9合金缓进给磨削工件表面及表层均表现为加工硬化,显微硬度为400~600 HV,硬化层深度在50~110μm,塑性变形层厚度为1~10μm。推荐的DD9磨削工艺参数组合为:砂轮线速度vs=20 m/s,进给速度vw=250 mm/min,磨削深度ap=0.6 mm。Aiming at the problem of grinding burns on the third-generation single crystal superalloy DD9,a three-factor and five-level experiment is designed in this paper.From the perspectives of surface morphology,microhardness and microstructure,the effect of grinding process parameters on grinding burns are studied.The experimental results show that:when the workpiece feed speed is less than 250 mm/min,the grinding surface roughness Ra changes slightly around 0.8μm,and the surface quality is good.When the feed speed is more than 250 mm/min and the grinding depth is more than 1.0 mm,the temperature in the grinding area rises sharply,the grinding lines are destroyed,grinding defects such as coating and pits appear,and the surface of the workpiece burns.The surface and surface of DD9 alloy are work hardened by slow feed grinding.The microhardness range is 400 to 600 HV,the depth of hardened layer is 50 to 110μm,and the thickness range of plastic deformation layer is 1 to 10μm.The recommended combination of DD9 grinding process parameters is:grinding wheel linear velocity vs=20 m/s,feed speed vw=250 mm/min,grinding depth ap=0.6 mm.

关 键 词：DD9 磨削烧伤 表面粗糙度 显微硬度 显微组织 

分 类 号：TG58[金属学及工艺—金属切削加工及机床] TG74[航空宇航科学与技术—人机与环境工程] V19