Effect of Molybdenum on Wear Resistance of Cr-Nb Hard-Faced S355JR Steel

Autor:	Nut Thongchitrugsa, Fritz Hartung, Gobboon Lothongkum, Amnuaysak Chianpairot
Rok vydání:	2014
Předmět:	Materials science Mechanical Engineering Abrasive Metallurgy Nucleation chemistry.chemical_element Shielded metal arc welding Microstructure Indentation hardness Carbide law.invention chemistry Mechanics of Materials Molybdenum law General Materials Science Eutectic system
Zdroj:	Materials Testing. 56:191-197
ISSN:	2195-8572 0025-5300
DOI:	10.3139/120.110554
Popis:	The effect of Mo on the abrasive wear resistance of (20–23)Cr-(7–8)Nb hard-faced S355JR steel by shielded metal arc welding (SMAW) was studied. Four types of flux, consisting of fixed Cr and Nb but varying Mo contents, coated on hard-facing electrode were used. Microstructure, micro hardness, and abrasive wear resistance of the hard-faced surface were investigated by ASTM G65 D procedure. The original microstructures consist of the primary coarse and eutectic carbides. Mo affects morphology of carbides by decreasing primary carbide size. When Mo content in the hard-faced surface was up to 6.43 wt.-%, the highest abrasive wear resistance and micro hardness were obtained. The decrease of primary carbide size is attributed to the increased nucleation induced by Mo addition. Network structure was observed when the Mo content reaches 10.19 wt.-%. The main mechanisms of wear are micro-cutting and carbide pulling out.
Databáze:	OpenAIRE
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