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| Wear Evaluation on Ni3Al/MnS Composite Related to Metallurgical Processes |
| Karin Gong1,LUO He-li2,ZHOU Zhi-feng3,TIAN Zhi-ling2,Lars Nyborg1,LI Chang-hai1 |
1. Department of Materials and Manufacturing Technology, Chalmers University of Technology, Gothenburg Se-412 96,Sweden
2. China Iron and Steel Research Institute Group, Beijing 100081, China
3. Department of ManufacturingEngineering and Engineering Management, City University of Hong Kong, Hong Kong, China |
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Abstract Iron alloyed Ni3Al with composition of Ni-18.8Al-10.7Fe-0.5Mn-0.5Ti-0.2B in atom percent (NAC alloy) showed attractive tribological properties under unlubrication condition at room temperature. The alloy was prepared by hot isostatic pressing (HIP) process. The wear properties were associated with its intrinsic deformation mechanism. Unfortunately, the single phase NAC-alloy worked inadequately with its counterpart disk, and also showed a poor machinability. In the present work, NAC-alloy matrix composite with 6% (volume percent) MnS particle addition was studied to improve its wear behaviors and performance on machining. Two metallurgical processes of HIP and vacuum casting were applied to produce the testing materials. Pin-on-disk (POD) measurements were carried out at room temperature. A commercial vermicular graphite cast iron was selected as a reference material. The counterpart disk was made of a grey cast iron as liner material in ship engines. The contact pressures of 2.83 MPa and 5.66 MPa were normally applied in the tests. The investigation indicated that MnS particle addition in the NAC-alloy composites functions as an effective solid lubricant, and improved wear properties and machinability of the materials. Obviously, as-cast NAC-alloy with in-situ formed MnS-phase was working more effectively with the counterpart, comparing to the HIPed NAC-alloy composite with MnS particles. At the high contact pressure of 5.66 MPa, the specific wear rate of the as-cast NAC-alloy composite was high. The phenomenon of the negative effect is mostly due to the brittle second NiAl phase as evidenced in the microstructure analysis.
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Received: 15 February 2011
Published: 25 July 2012
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Corresponding Authors:
Karin Gong
E-mail: karin.gong@chalmers.se
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2012, Vol. 19 
