P元素加入形式对铁基金刚石工具胎体组织性能的影响
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摘要
以常用的CuP8,FeP24两种预合金粉作为研究对象,运用SEM,EDS,硬度和抗弯强度等研究分析手段,研究了以不同形式加入P元素对铁基金刚石工具胎体组织性能的影响.结果表明,烧结后胎体组织由α-Fe、含铁固溶体(Cu)、Fe3C化合物组成,加入FeP24的烧结胎体中还存在Fe2P和FeP化合物. P元素加入形式对胎体性能影响显著,向胎体中加入CuP8,P元素几乎全部脱离CuP8进入铁基体,相比于加入FeP24的胎体,P元素分布更均匀,胎体硬度、抗弯强度等性能指标均有提高. FeP24在热压过程中会产生微裂纹,这些微裂纹可能成为基体的裂纹源而降低胎体的抗弯强度.因此,选用CuP8预合金粉更有利于获得高性能铁基金刚石工具胎体.
In this paper, we took the pre-alloyed powder CuP8 and FeP24 as the object, by using SEM, EDS and analyzing the hardness and bending strength of the matrix, to explore how different kinds of phosphorus-containing prealloyed powder influence the microstructure and properties of Fe-based sintered matrix. The results have shown that both of the two kinds of matrix are mainly composed of α-Fe, Cubased solid solution and Fe3 C. However, matrix that has been added FeP24 also contains Fe2 P and FeP. Compared with matrix which contains FeP24, almost all the phosphorus in matrix which contains CuP8 is transferred from CuP8 to α-Fe and more evenly distributed, leading to a higher hardness and bending strength of the matrix. During the hot-pressing process, microcrack would appear on the FeP24 particle and may become the crack source of matrix, reducing the bending strength of the matrix. We thus came to the conclusion that CuP8 can improve the performance of Fe-based diamond tool.
In this paper, we took the pre-alloyed powder CuP8 and FeP24 as the object, by using SEM, EDS and analyzing the hardness and bending strength of the matrix, to explore how different kinds of phosphorus-containing prealloyed powder influence the microstructure and properties of Fe-based sintered matrix. The results have shown that both of the two kinds of matrix are mainly composed of α-Fe, Cubased solid solution and Fe3 C. However, matrix that has been added FeP24 also contains Fe2 P and FeP. Compared with matrix which contains FeP24, almost all the phosphorus in matrix which contains CuP8 is transferred from CuP8 to α-Fe and more evenly distributed, leading to a higher hardness and bending strength of the matrix. During the hot-pressing process, microcrack would appear on the FeP24 particle and may become the crack source of matrix, reducing the bending strength of the matrix. We thus came to the conclusion that CuP8 can improve the performance of Fe-based diamond tool.
引文
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[2]龙伟民,高雅,何鹏,等.钎焊技术在金刚石工具中的应用[J].焊接,2017(4):10-16.Long Weimin,Gao Ya,He Peng,et al.Application of brazing technology to diamond tools manufacturing[J].Welding&Joining,2017(4):10-16.
[3]Zhang M,Zhang W,Liu Y,et al.FeCoCrNiMo high-entropy alloys prepared by powder metallurgy processing for diamond tool applications[J].Powder Metallurgy,2018,61:1-8.
[4]Cheng J,Wu J.Experimental study on the fabrication method of diamond ultra-small micro-grinding tool[J].International Journal of Advanced Manufacturing Technology,2018,97:1-14.
[5]Ye X,Guo S,Yang L,et al.New utilization approach of microwave thermal energy:Preparation of metallic matrix diamond tool bit by microwave hot-press sintering[J].Journal of Alloys&Compounds,2018,748:645-652.
[6]Hou M,Guo S,Yang L,et al.Fabrication of Fe-Cu matrix diamond composite by microwave hot pressing sintering[J].Powder Technology,2018,338:36-43.
[7]孙宝军,肖冰,王波.氨分解气氛保护下钎焊金刚石界面微观组织分析[J].焊接学报,2017,38(9):87-90.Sun Baojun,Xiao Bing,Wang Bo.Interfacial microstructure of brazed diamond grits under ammonia dissociating protective atmosphere[J].Transactions of the China Welding Institution,2017,38(9):87-90.
[8]Xie Delong,Wan Long,Song Dongdong,et al.Low-temperature sintering of FeCuCo based pre-alloyed powder for diamond bits[J].Journal of Wuhan University of Technology-Mater.Sci.Ed.,2016,31(4):805-810.
[9]吕智,郑超,莫时雄,等.超硬材料工具设计与制造[M].北京,冶金工业出版社,2010.
[10]申思,宋月清,汪礼敏.粉末预合金化对金刚石工具胎体性能的影响[J].金刚石与磨料磨具工程,2008(1):35-38.Shen Si,Song Yueqing,Wang Limin.Effect of powder pre-alloying on the properties of diamond tools matrix[J].Diamond&Abrasives Engineering,2008(1):35-38.
[11]隆威,任慧利.新型优质铁基金刚石锯片的研制与应用[J].金刚石与磨料磨具工程,1998(4):15-17.Long Wei,Ren Huili.The development and application of new high quality Fe-based diamond saw blade[J].Diamond&Abrasives Engineering,1998(4):15-17.
[12]肖俊玲,胡国程,丘定辉.金刚石工具铁基结合剂的应用及展望[J].湖南有色金属,2002,18(1):29-31.Xiao Junling,Hu Guocheng,Qiu Dinghui.The history,current development and divination on iron-based matrix of diamond tool[J].Hunan Nonferrous Metals,2002,18(1):29-31.
[13]郑日升,宋冬冬,夏学胜,等.添加组分对LFP全预合金粉末性能的影[J].超硬材料工程,2015,24(5):30-34.Zheng Risheng,Song Dongdong,Xia Xuesheng,et al.Influence of addition component on the properties of LFP pre-alloy powder[J].Superhard Material Engineering,2015,24(5):30-34.
[14]龙伟民,刘文明,朱坤,等.预合金粉在金刚石工具烧结中的钎焊作用[J].焊接,2008(3):36-38.Long Weimin,Liu Wenming,Zhu Kun,et al.Brazing effects of pre-alloyed powder in sintering of diamond tool[J].Welding&Joining,2008(3):36-38.
[15]Chu Z Q,Guo X Y,Liu D H,et al.Application of pre-alloyed powders for diamond tools by ultrahigh pressure water atomization[J].Transactions of Nonferrous Metals Society of China,2016,26(10):2665-2671.
[16]杜全斌,龙伟民,钟素娟,等.烧结温度对FeCu基烧结胎体组织及性能的影响[J].焊接,2017(3):43-47.Du Quanbin,Long Weimin,Zhong Sujuan,et al.Effect of sintering temperature on microstructure and properties of FeCu-based matrix[J].Welding&Joining,2017(3):43-47.