Yao Bibo, Zhou Zhaoyao, Duan Liuyang, Xiao Zhiyu
School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China.
Materials (Basel). 2016 Mar 4;9(3):161. doi: 10.3390/ma9030161.
Powder metallurgy (P/M) technique is usually used for manufacturing porous metal materials. However, some P/M materials are limitedly used in engineering for their performance deficiency. A novel 304 stainless steel P/M material was produced by a solid-state sintering of 304 stainless steel powders and 304 short stainless steel fibers, which were alternately laid in layers according to mass ratio. In this paper, the compressive properties of the P/M materials were characterized by a series of uniaxial compression tests. The effects of fiber content, compaction pressure and high temperature nitriding on compressive properties were investigated. The results indicated that, without nitriding, the samples changed from cuboid to cydariform without damage in the process of compression. The compressive stress was enhanced with increasing fiber content ranging from 0 to 8 wt.%. For compaction pressure from 55 to 75 MPa, greater compaction pressure improved compressive stress. Moreover, high temperature nitriding was able to significantly improve the yield stress, but collapse failure eventually occurred.
粉末冶金（P/M）技术通常用于制造多孔金属材料。然而，一些粉末冶金材料由于性能缺陷在工程中的应用有限。通过将304不锈钢粉末和304短不锈钢纤维按质量比交替分层铺放，采用固态烧结法制备了一种新型304不锈钢粉末冶金材料。本文通过一系列单轴压缩试验对粉末冶金材料的压缩性能进行了表征。研究了纤维含量、压实压力和高温渗氮对压缩性能的影响。结果表明，在不进行渗氮处理的情况下，样品在压缩过程中从长方体变为圆柱形且未损坏。当纤维含量从0增加到8 wt.%时，压缩应力增大。对于55至75 MPa的压实压力，更大的压实压力提高了压缩应力。此外，高温渗氮能够显著提高屈服应力，但最终会发生坍塌失效。
