锻压技术

热锻模耐热层Ni60-WC表面强化研究

英文标题：Study on surface hardending of heat-resistant layer Ni60-WC of hot forging die

作者：柳旭马维金王洪福王华昌

单位：中北大学武汉理工大学

分类号：TG316；TG174

出版年,卷(期):页码：2014,39(6):94-97

摘要：

对热锻模模膛表面进行强化，在热锻模模膛表面熔覆Ni60-WC金属陶瓷层，其中陶瓷粉末以70%/30%、80%/20%和90%/10%的3种比例混合。采用等离子喷涂、等离子重熔和喷焊3种方法对WC的3种比例粉末试样进行实验，分析其显微硬度、热膨胀系数、比热容和热导率。实验分析发现：3种方法中喷焊的显微硬度最高，喷涂其次，重熔最差；增加WC的比例分数，覆层的显微硬度逐渐增大；3种处理方法中，喷焊试样的热物性和孔隙率最好。实验结果表明，30%WC粉末采用喷焊方法得到的覆层更有利于热锻模模膛表面的强化。

The cavity surface of hot forging die was strengthened with cladding layer of Ni60-WC cermet. The cermet powder was mixed with three proportions, 70%/30%, 80%/20% and 90%/10%. Plasma spray, plasma remelting and spray welding were used in the experiment to test the three proportions of powers and analyze their microhardness, coefficient of thermal expansion, specific heat capacity and thermal conductivity. During the experiment, the spray welding sample shows the highest microhardness, then the plasma spray and the spray welding show the lowest one. The microhardness of cladding layer becomes higher when WC proportion increases. The spray welding sample shows the best thermophysical property and pore rate in the three treatments. The experiment shows that 30%WC powder together with the spray welding method is the best for the cavity surface strengthening of hot forging die.

基金项目：

国家自然科学基金资助项目（50675165）

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