A comparative investigation on MIM418 superalloy fabricated using gas- and water-atomized powders
A comparative investigation on MIM418 superalloy fabricated using gas- and water-atomized powders
复制标题
气雾化粉末和水雾化粉末制备的 MIM418 高温合金的比较研究
DOI：
10.1016/j.powtec.2015.09.023
复制
发表时间：
2015-12
影响因子：
5.2
通讯作者：
Li Zhou
中科院分区：
文献类型：
--
作者：
Zhang Lin;Chen Xiaowei;Li Dan;Chen Chi;Qu Xuanhui;He Xinbo;Li Zhou
对气雾化(GA)和水雾化(WA)K418高温合金粉末进行了注射成形，并对MIM418高温合金的组织和力学性能进行了详细的对比研究。由于GA样品的含氧量较低，孔径分布较窄，堆积密度较高，因此具有比WA样品更高的烧结密度。两种高温合金在热等静压处理后都达到了接近完全致密的程度，并且提高热等静压温度会导致晶粒长大，碳化物颗粒留在新晶内原有的粒子界(PPBS)位置。GA粉末产生更细小、更均匀的γ‘相和碳化物，以及等轴晶(31μm)，而WA粉末产生更大的γ’相，粗化率高，PPBS浓度高，晶粒尺寸小(26μm)。GA样品具有令人满意的抗拉强度(1425 Mpa)和屈服强度(1004 Mpa)，延伸率显著提高(19.4%)，适用于高性能应用。Wa样品的机械性能与铸造K418高温合金相当，可用于要求不太苛刻和低成本的应用。
Gas atomized (GA) and water atomized (WA) K418 superalloy powders were injection molded, and a detail comparative investigation on microstructure and mechanical properties of MIM418 superalloys was carried out. The GA sample possesses higher sintering density than the WA sample due to its lower oxygen content, narrow pore size distribution and higher packing density. Both superalloys achieve near full dense after HIPing, and increasing HIPing temperature leads to grain growth and leaving carbide particles at the site of the original prior particle boundaries (PPBs) within the new grains. The GA powder leads to finer and more homogeneous γ′ precipitates and carbides, as well as equiaxed grains (31 μm), while the WA powder results in larger γ′ precipitates with higher coarsening rate, higher concentration of PPBs, and smaller grain size (26 μm). The GA sample exhibits satisfactory levels of tensile strength (1425 MPa) and yield strength (1004 MPa) combined with a significantly improved elongation (19.4%), which is suitable for high performance applications. The WA sample has comparable mechanical properties with that of the cast K418 superalloy, which can be used for less critical and low cost demand applications.
登录
查看更多内容
影响因子：
6.2
作者：
Litao Chang;Wen-ru Sun;Y. Cui;Faqiang Zhang;Rui Yang
通讯作者：
Litao Chang;Wen-ru Sun;Y. Cui;Faqiang Zhang;Rui Yang
影响因子：
6.2
作者：
Zhao-xia Shi;Jian-Xin Dong;Mai-cang Zhang;Lei Zheng
通讯作者：
Zhao-xia Shi;Jian-Xin Dong;Mai-cang Zhang;Lei Zheng
影响因子：
1.4
作者：
J. M. Contreras;A. Jiménez-Morales;J. M. Torralba
通讯作者：
J. M. Contreras;A. Jiménez-Morales;J. M. Torralba
DOI：
10.1016/j.msea.2014.01.095
发表时间：
2014-04-02
影响因子：
6.4
作者：
Chang, Litao;Sun, Wenru;Yang, Rui
通讯作者：
Yang, Rui
DOI：
10.2497/jjspm.58.33
发表时间：
2011
期刊：
Journal of The Japan Society of Powder and Powder Metallurgy
影响因子：
--
作者：
Hikaru Ikeda;T. Iwahashi;Toshiko Osada;H. Miura
通讯作者：
Hikaru Ikeda;T. Iwahashi;Toshiko Osada;H. Miura