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Effect of titanium on dry sliding wear behavior of hot forged P/M low alloy steels
, S. Prathiba, , V. Sai Akhil
Published in Elsevier Ltd
2019
Volume: 22
   
Pages: 1380 - 1389
Abstract
Powder metallurgy (P/M) is one of the developing manufacturing processes for the production of steels, has out spread in all critical areas of manufacturing field like automobile, aerospace, precision manufacturing because of its good features such as easy formability, good strength, net-shape manufacturability, low raw materials cost and low relative material wastage. Alloys formed through P/M route are typically porous. The wear behaviour of wrought materials is entirely different from the porous materials due to the pores present in the P/M materials. The presence of pores in the sintered P/M materials acts as main source for crack initiation, which further leads to weakness. Addition of alloying element in the base material also plays a significant role in changing wear behavior. During sintering process, the alloying element Titanium (Ti) forms hard secondary phase. The present research work pertains to study the effect of Titanium on the dry sliding wear behavior of sintered/hot forged low alloy steel (Fe-1%C), as they find a number of applications as fasteners, cutters, tools, bearing roller etc. The sintered/hot forged preforms were subjected to wear behaviour study on pin-on disc tribometer (ASTM G99) at normal loads of 30, 50 and 70N against EN38 steel disc (HRC60) with sliding speed of 2m/s under dry conditions. The micrographs of as-sintered preform reveal the ferritic-pearlitic structure, whereas the combination of Widmanstatten type ferrite, bainite and pearlite structure was observed on the hot forged Fe-1%C-1%Ti alloy steels. The hot forged Ti added alloy steel offers superior resistance to wear than the low alloy steel. Wear regimes of P/M steels has been characterized using combined techniques of optical and Scanning Electron Microscope (SEM). It was inferred from the wear pattern microstructure that, the presence of Ti element gets embedded in the soft matrix of Fe-C as secondary hard phase. Delamination wear is observed to be a common wear mechanism in both hot forged P/M low alloy steels. © 2019 Elsevier Ltd.
About the journal
JournalData powered by TypesetMaterials Today: Proceedings
PublisherData powered by TypesetElsevier Ltd
ISSN22147853