Microstructure And Erosion-Corrosion Behaviour Of As-Cast High Chromium White Irons Containing Molybdenum In Aqueous Sulfuric-Acid Slurry

Archives of Metallurgy and Materials

S. Imurai¹  T. Chairuangsri¹  Ch. Thanachayanont²  J.T.H. Pearce³ 

[1] DEPARTMENT OF INDUSTRIAL CHEMISTRY, CHIANG MAI UNIVERSITY, CHIANG MAI, 50200, THAILAND;NATIONAL METAL AND MATERIALS TECHNOLOGY CENTER, PATHUMTHANI, 12120, THAILAND;PANYAPIWAT INSTITUTE OF MANAGEMENT, NONTHABURI, 11120, THAILAND

关键词: Keywords: high chromium cast irons;    microstructure;    electron microscopy;    erosion;    corrosion;   

DOI  :  10.1515/amm-2015-0230

学科分类：金属与冶金

来源: Akademia Gorniczo-Hutnicza im. Stanislawa Staszica / University of Mining and Metallurgy

【 摘 要 】

Microstructure and erosion-corrosion behaviour of as-cast high chromium white irons containing molybdenum in aqueous sulfuric-acid slurry was studied. The experimental irons contained 28 wt.%Cr with a Cr:C ratio of about 10 and up to 10 wt.%Mo. The irons with up to 6 wt.%Mo are hypoeutectic, whereas the iron with 10 wt.%Mo becomes eutectic/peritectic. Mo addition promotes formation of M23C6 and M6C, instead of typical M7C3. Erosion-corrosion testing was performed in aqueous sulfuric-acid slurry containing alumina particles. The hypoeutectic Fe-28Cr-2.7C-1Mo with mainly M7C3 and the eutectic/peritectic Fe-28Cr-2.6C-10Mo showed reduced wear rates of about 30% and 7% of that of the reference iron without Mo addition, respectively. The reduction of the carbide-matrix hardness difference, the increase of corrosion resistance of the matrices, and the increase of macro-hardness are determining factors for the improvement of erosion-corrosion resistance of the irons.

【 授权许可】

Unknown