Wear Patterns and Mechanism of Coated Cemented Carbide Tool in High Speed Milling Superalloy GH2132
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摘要: 用2种硬质合金涂层刀具进行铁基高温合金GH2132的高速干铣削试验,采用电子扫描显微镜(scanning electron microscopy,SEM)观察刀具的磨损形貌,对刀具的主要磨损机理进行了分析.结果表明:刀具的磨损形态主要是后刀面磨损;KC725M涂层由TiN、TiAlN组成,涂层易剥落;KC525M涂层只有1层TiAlN,涂层不易脱落,但由于机械冲击产生沟槽磨损,形成应力集中,导致在切削刃处产生较大的磨损;不论KC525M还是KC725M,涂层剥落后,切削区产生的瞬时高温均使基体中粘结相发生软化,造成硬质相颗粒脱落和基体的剧烈磨损.研究结果可用于指导高速切削刀具材料的设计、合理选用及刀具磨损控制.Abstract: Two kinds of coated Cemented carbide tools were used to mill Iron-based superalloy GH2132 at high-speed under dry cutting condition.Wear patterns wear observed by SEM,the main mechanism of tools were analysed,Resultsshow that flank wear is the main wear pattern;the coating of KC725 is made from TiN and TiAlN,so it is more easy to flake;the coating of KC525M is made from only TiAlN,it is not easy to flake,but groove wear was find at cutting edge because of Mechanical impact,the formation of stress concentration leads to more bigger wear at cutting edge.No matter KC525M or KC725M the felting phase is intenerated for the instantaneous heat collection in the cutting section,which leads to the falling of the rigid phase grains and serious abrasion of the base body.The results might be helpful to guiding the design and selection of tool materials and control of tool wear in high speed machining processes.
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Keywords:
- coated tools /
- super alloy /
- GH2132 /
- high speed milling /
- wear
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