High-temperature mechanical- and fatigue properties of cast alloys intended for use in exhaust manifolds
2014 (English)In: Materials Science & Engineering: A, ISSN 0921-5093, Vol. 616, 78-87 p.Article in journal (Refereed) Published
In the present work materials for use in exhaust manifolds of heavy-duty diesel engines were tested in air from 20 to 1000 degrees C with respect to mechanical properties. Two cast irons, SiMo51 and Ni-resist D5S, four austenitic cast steels, HF, A3N, HK30 and HK-Nb, and one ferritic cast steel, 1.4509 were studied. The experimental work included thermal conductivity, thermal expansion, uniaxial stress-strain testing, low-cycle fatigue testing up to 30,000 cycles and fractography. Below 500 degrees C, SiMo51 is superior. At higher temperatures, a transition from elastic to plastic strain dominance was observed for the cast irons, reducing their performance. Carbide-forming elements increase heat conductivity and result in a dendrite-like fracture surfaces during fatigue testing. The austenitic steels are superior only at higher temperatures.
Place, publisher, year, edition, pages
2014. Vol. 616, 78-87 p.
Low-cycle fatigue, High-temperature mechanical properties, Ductile cast iron, Cast stainless steel, Exhaust manifolds, Physical properties
Metallurgy and Metallic Materials
IdentifiersURN: urn:nbn:se:kth:diva-156112DOI: 10.1016/j.msea.2014.08.014ISI: 000343352400010ScopusID: 2-s2.0-84906506637OAI: oai:DiVA.org:kth-156112DiVA: diva2:777933
QC 201501092015-01-092014-11-212015-05-07Bibliographically approved