Engineering Material Selection for Automotive Exhaust Systems Using CES Software

Year 2017, , 50 - 60, 28.06.2017

Ikpe Aniekan E. , Orhorhoro Ejiroghene Kelly Gobir Abdulsamad

https://doi.org/10.19072/ijet.282847

Cited By: 8

Abstract

The
aim of this report is focused onreviewing the automotive exhaust system with
respect to its in-service conditionsand selection of suitablematerials for
exhaust manifold, downpipe silencer/ muffler box and tail pipe in an exhaust
system. In doing this, the functions of each component were discussed,
highlighting how they function as part of a system and CES Edupack software was
employed in the material selection process. Mass, cost, high temperature
(>800^oC for exhaust manifold and >400^oC for
downpipe silencer/ muffler box and tail pipe) and high corrosion resistance
were used as criteria for the material selection. Variety of materials
including Nickel-based superalloys, stainless steel, Nickel-chromium alloys
were obtained in the search result for exhaust manifold. Similarly, low alloy
steels, stainless steel, grey cast iron,Nickel-based superalloys, Nickel-chromium
alloys were obtained in the search result for downpipe silencer/ muffler box
and tail pipe. Nickel-based superalloys and Nickel-chromium alloys possess
suitable properties for this application, but were not selected due to their
high densities and high cost. Low allow steels were not selected because they tends to exhibits poor corrosion resistance
when exposed to salt on the road surface and condensate from the exhaust
system. Grey cast iron has low tensile strength and elongation and therefore not
exhibit enough toughness required to withstand the severe working conditions.However,
stainless steel (Ferritic
stainless steel and Austenitic stainless steel) was selected due to its
considerable price, low density, excellent corrosion resistant and acceptable
strength at elevated temperatures. 

Keywords

Cost, Exhaust system, Temperature, Corrosion, Mass, Material, Service life

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