Fatigue failure properties of injection molded superalloy compacts
Fatigue failure properties of injection molded superalloy compacts
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注射成型高温合金坯体的疲劳失效特性
DOI：
10.2497/jjspm.58.679
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
H. Miura
中科院分区：
文献类型：
--
作者：
Hikaru Ikeda;Toshiko Osada;Hyungoo Kang;F. Tsumori;H. Miura
高温合金由于其优异的耐腐蚀性、抗氧化性和高温强度等特性，已被特别用于航空航天和原子能应用领域。Inconel 718是典型的镍基高温合金之一。然而，由于其加工性能差，不容易以低成本生产复杂形状的零件。在这项研究中，金属注射成型（MIM）工艺，近净形状的粉末成形之一，已被应用到制造Inconel 718合金压块使用两种类型的粉末：气体和水雾化粉末。通过对MIM工艺的优化，获得了接近全密度（98 ~ 99%）的相对密度.然而，热处理的烧结Inconel 718压块的疲劳强度显示出热处理的锻造材料的65%，由于剩余的孔隙。利用考虑夹杂物的疲劳极限预测方程，讨论了残余气孔对疲劳强度的影响。
Superalloys have been used especially for aerospace and atomic energy applications because of their excellent attributes of high corrosion and oxidation resistance, and high temperature strength. A Inconel 718 is one of representative Ni-base superalloys. However, it is not easy to produce the complicate shaped parts with low cost due to their poor workability. In this study, Metal Injection Molding (MIM) process, one of near net-shape powder forming, has been applied to fabricate the Inconel 718 alloy compacts using two type of powders; gas and water atomized powders. By optimizing the MIM process, their obtained relative density was near full density (98∼99 %). However, the fatigue strength of heat treated sintered Inconel 718 compacts showed 65 % of heat treated wrought materials due to the remained pores. The effect of remained pores on fatigue strength was discussed by the prediction equation of endurance limit considering the inclusion.