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The effect of aging on the Microstructure and Hardness of Stellite 12 alloy overlayer by PTA process  

정병호 (부경대학교 재료공학부)
김무길 (부경대학교 재료공학부)
이성열 (한국해양대학교 기계소재공학부)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.26, no.1, 2002 , pp. 68-75 More about this Journal
Abstract
Stellite 12 alloy-powders were overlaid on 410 stainless steel valve seat by plasma transferred arc(PTA)process. Variation of microstructure and hardness of overlaid deposit with aging time at $750^{\circ}C$ was investigated. The deposit showed hypoeutectic microstructure, which was consisting of primary cobalt dendrite and networked $M_{7}C_{3}$type eutectic carbides. After aging new M_{23}C_{6}$ carbide was formed by the partial decomposition of $M_7C_3$ type eutectic carbides and finely dispersed $M_{23}C_6$ type carbides were also precipitated in the matrix. Hardness of the deposit was increased with increase of aging time at $750^{\circ}C$ and showed maximum value at 35hours. After showing maximum value, it was fallen down again at 70hours because of overaging. The increase of hardness in aging is ascribed to the formation of new stable $M_{23}C_6$ type carbide by the partial decomposition of $M_7C_3$ type eutectic carbides and also precipitation of finely dispersed $M_{23}C_6$ carbides in matrix.
Keywords
Plasma Transferred Arc Process; Overlaid Deposit; Aging; Stellite; Eutectic Carbide;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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