Vaccum compressive sintering of multiple allloy powders for manufacturing valve seat on a Gleeble-1500 simulator
Fe-based multiple allloy powders for manufacturing valve seat were sintered using a GLEEBLE1500 thermo-mechanical simulator. Each 12 g mixture multiple allloy powders including Cr(2~8)wt％，Mo(2~8)wt％，Ni(1~2)wt％， Co(2～4)wt％，C0.8wt％ and Fe(bal.) were mixed, compacted and sintered on a Gleeble-1500 thermal simulator with 50Kg force applied on both ends of the compact. Microstructures and properties of the sintered alloy have been characterized by hardness test, OM, SEM,EDX and XRD analysis. Results indicate that a well-combined property can be obtained when the alloy sintered at 1240℃ for 30 minutes. Thus, the hardness and density of the alloy are 38 HRC and 7.23g/cm3, respectively. Meanwhile, Cr and Mo diffuse uniformly in matrix and stable carbides formed at grain boundaries in the sintering process. It is also found that the elements of Cr and Mo firstly segeragates into network distribution, then interdiffusion of Cr,Mo and carbon takes place, forming carbides in grain boundaries during sintering,. If the temperature is too high,such as 1280℃, carbides dissolves into matrix again and the microstructure of the alloy deteriorates into an as-cast structure.
multiple allloy powders sintering thermo-mechanical simulation lattice constant
ZHU Yuan-zhi YIN Zhi-min
Hubei Province High-temperature Ceramics and Refractories Key Laboratory, Wuhan University of Scienc School of Material Science & Engineering, Central South University.，Changsha China, 410083
国际会议
郑州
英文
2007-10-23（万方平台首次上网日期，不代表论文的发表时间）