Wear behavior and mechanism of single-layer brazed CBN abrasive wheels during creep-feed grinding cast nickel-based superalloy
Wear behavior and mechanism of single-layer brazed CBN abrasive wheels during creep-feed grinding cast nickel-based superalloy
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DOI：
10.1007/s00170-010-2643-1
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发表时间：
2010-04
期刊：
影响因子：
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通讯作者：
W. Ding;Jiu-hua Xu;Zhenzhen Chen;H. Su;Yucan Fu
中科院分区：
文献类型：
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作者：
W. Ding;Jiu-hua Xu;Zhenzhen Chen;H. Su;Yucan Fu
研究了单层钎焊CBN砂轮蠕动磨削镍基高温合金K424时的磨损行为和机理。测量作用在磨轮上的磨削力和温度。利用光学显微镜和扫描电子显微镜来检测颗粒突出和车轮磨损形态。测定了砂轮表面钎焊CBN晶粒突出高度的正态分布。结果表明，尽管缓进给磨削镍基高温合金时磨削区温度仅为180℃左右，但由于单个晶粒的温度高达500~600℃，磨削热对晶粒磨损仍具有重要影响。钎焊轮的磨损形式分为轻度磨损（磨粒磨损和晶粒微观断裂）和严重磨损（晶粒宏观断裂、结合层侵蚀）。钎焊 CBN 晶粒和 Ag-Cu-Ti 结合层的牢固连接显着提高了抗晶粒拔出能力。
Wear behavior and mechanism of single-layer brazed CBN abrasive wheels during creep-feed grinding nickel-based superalloy K424 was investigated. Grinding force and temperature acting on the abrasive wheels were measured. Optical microscopy and scanning electron microscopy were utilized to detect grain protrusion and wheel wear morphology. The normal distribution of the protrusion height of the brazed CBN grains on the wheel surface was determined. The results show that, though the grinding zone temperature is merely about 180°C during creep-feed grinding nickel-based superalloy, the grinding heat still has an important effect on the grain wear owing to the high temperature of the individual grain up to 500–600°C. Wear patterns of brazed wheels are composed of mild wear (attritious wear and grain micro-fracture) and severe wear (grain macro-fracture, erosion of the bonding layer). Strong joining of brazed CBN grains and Ag–Cu–Ti bonding layer improves significantly the resistance to grain pullout.