Wear Evaluation on Ni3Al/MnS Composite Related to Metallurgical Processes
Artikel i vetenskaplig tidskrift, 2012

Iron alloyed Ni3Al with composition of Ni-18. 8A1-10. 7Fe0. 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 (manganese sulfide )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.

machinability

casting

intermetallics

HIP processing

friction coefficient

specific wear rate

sliding wear

Författare

Karin Anne Xia Gong

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

H. L. Luo

China Animal Husbandry Group

Zhi-feng Zhou

City University of Hong Kong

Zhi-ling Tian

China Animal Husbandry Group

Lars Nyborg

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Changhai Li

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Journal of Iron and Steel Research International

1006-706X (ISSN)

Vol. 19 46-54

Ämneskategorier

Materialteknik

Styrkeområden

Materialvetenskap

DOI

10.1016/S1006-706X(12)60112-5