Abstract
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.
Highlights
Porous metals have been widely investigated and applied due to their distinct permeability, sound and energy absorption properties, heat transfer and mechanical properties [1,2]
The powder metallurgy (P/M) samples and their parameters are given in Table 1.It should be noted that the material has higher porosity, ranging from 47.50% to 60%, while the porosity of normal P/M material is about 5%–15% [26]
Thethat strength and elasticitystress modulus of fiber were the densification stageofwith increasing content the the same strain, and differences were greater higher than those powder, so fiberfiber deformed lessinfrom same stress
Summary
Porous metals have been widely investigated and applied due to their distinct permeability, sound and energy absorption properties, heat transfer and mechanical properties [1,2]. Porous sintered stainless steel material has advantages in mechanical properties, corrosion and high temperature resistance. It mainly contains metal fiber sintered sheets (MFSSs) and P/M material. Kurgan [7,8] and Wang [9] revealed how the porosity, sintering temperature and environment influence the microstructure and mechanical properties of stainless steel P/M material, and built a model for the relationship between compressive strength and porosity. Solution strengthening is an appropriate hardening treatment method of improving the mechanical properties of porous stainless steel material. Few reports have discussed the manufacture and mechanical properties of 304 stainless steel fiber-reinforced P/M materials, a new class of porous metal. The effects of the fiber content, compaction pressure and high temperature nitriding on the compressive properties were investigated in detail
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