Effect of heat treatment on microstructure and mechanical properties of Ti-alloyed hypereutectic high chromium cast iron
2012 (English)In: ISIJ International, ISSN 0915-1559, Vol. 52, no 12, 2288-2294 p.Article in journal (Refereed) Published
The effect of heat treatment on the microstructure and mechanical properties of Ti-alloyed hypereutectic High Chromium Cast Iron (HCCI) containing Fe-17 mass%Cr-4 mass%C-1.5 mass%Ti was investigated. The size distribution and the volume fraction of carbides (M7C3 and TiC) as well as the matrix structure (martensite) were examined by means of scanning electron microscopy (SEM) and electron backscattered diffraction (EBSD). It was found that the number of fine secondary M7C3 carbides with a size below 1 μm increases with lower holding temperatures and shorter holding times during heat treatment. The number of coarse primary M7C 3 carbides with a size above 11.2 μm increases with increasing holding temperatures and longer holding times. In addition, the number of TiC carbides increases with increasing holding times, and martensite units are more refined at longer holding times and lower holding temperatures, respectively. Moreover, the volume fraction of martensite increases with increased holding times. In conclusion, low holding temperatures close to the eutectic temperature and long holding times are the best heat treatment strategies in order to improve wear resistance and hardness of Ti-alloyed hypereutectic HCCI.
Place, publisher, year, edition, pages
2012. Vol. 52, no 12, 2288-2294 p.
Heat treatment, High Chromium Cast Iron, Mechanical properties, Microstructure, Particle size distribution, Wear resistance
Metallurgy and Metallic Materials
IdentifiersURN: urn:nbn:se:kth:diva-106215DOI: 10.2355/isijinternational.52.2288ISI: 000312968000025ScopusID: 2-s2.0-84871766093OAI: oai:DiVA.org:kth-106215DiVA: diva2:573241
QC 20130116. Updated from accepted to published.2012-11-302012-11-302013-09-13Bibliographically approved