Rotary Forging of Sintered Iron Based Composites
Rotary Forging of Sintered Iron Based Composites
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DOI：
10.1179/pom.1991.34.1.33
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发表时间：
1991-01
影响因子：
1.4
通讯作者：
C. Zhou;J. R. Moon;S. Peacock
中科院分区：
文献类型：
--
作者：
C. Zhou;J. R. Moon;S. Peacock
由高速钢、不锈钢、非合金铁粉和分散的Si 3 N4颗粒组成的烧结铁基复合材料正在开发中，以满足在环境温度和高温下的苛刻磨损条件的需要。设想用作重型柴油发动机中的阀座。介绍了制备这种复合材料的方法，包括粉末混合、压制、预烧结和旋转锻造。显示了高达3重量%（7体积%）在铁基合金基体中成功地掺入了Si_3N_4颗粒，初始密度为78- 80%的烧结坯经摆辗后致密度可达95.8%。研究了不同添加剂、工艺和摆辗参数对最终摆辗密度的影响，以优化不同成分的生产路线。PM/0544
Sintered iron based composites, consisting of a matrix of high speed steel, stainless steel, unalloyed iron powders, and dispersed Si3N4 particles, are being developed to meet the needs of arduous wear conditions at both ambient and elevated temperatures. Use as valve seats in heavy duty diesel engines is envisaged. A route for producing such composites, including mixing of powders, pressing, presintering, and rotary forging, is described. It is shown that up to 3 wt-% (7 vol.-%) of Si3N4 particles can be incorporated successfully in alloyed iron based matrixes, and that relative densities up to 95·8% can be reached by rotary forging from sintered preforms of initial density 78–80%. The effects of different additives, processes, and rotary forging parameters on final rotary forged densities were studied to optimise the production routes for different compositions. PM/0544