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STUDY ON CCT DLAGRAM AND TRANSFORMATION MICROSTURCTION AND PROPERTIES OF SURFACING MATERIALS

Wang Jianguo,Wang Gui,Liu Xiaogang,Hou Chunqing  
Simulating surfacing hot circulation condition by use of Formastor-Digital full-automatic transformation testing instrument,the continuous cooling transformation diagram of surfacing materials was measured and its transformation microstruction and properties were also studied.The results show:the surfacing materials have very high quenching degree and quench-hardening through quenching and harden quenching.Its AP was severely delayed and difficult to appear,AB was obviously put off ,the critical quenching cooling speed was approximately 300/min.On the condition of surfacing hot circulation,the transformation microstruction was not welldistributed.When the cooling speed was slightly slow,the carbide was segregated out and was ditributed by seperated state.
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