Application of High Frequency Induction Heating to the Cladding of Cobalt-based Alloy on Steel Surface
Date Issued
2006
Date
2006
Author(s)
Chang, Hou-Ting
DOI
zh-TW
Abstract
SUS304, S45C, and SK3 are cladded with cobalt-based Stellite 6 alloy by means of high frequency induction heating. The influence of heating power and heating time on the microstructure, hardness and chemical compositions of the caldded layer has been studied.
The results show that there are two types of microstructure in the cladded layer depending on the heating power and heating time if SUS304 is used as base metal. They are cellular dendrite and columnar dendrite. When the heating power or the heating time increases, the hardness of the cladded layer will decrease. The content of Co and Fe within the grain is much more than that at the grain boundary, but the content of Cr and W is more at the grain boundary.
If S45C or SK3 is used as base metal, there are three types of microstructure in the cladded layer depending on the heating power and heating time. They are cellular dendrite, columnar dendrite and needle structure. If the microstructure of the cladded layer is cellular dendrite or column dendrite, the hardness of the cladded layer will decrease with increasing the heating power or heating time.
If the needle structure appears, the hardness of the cladded layer will increase with increasing the heating power or heating time owing to the precipitation of carbide in the matrix.
No matter what the microstructure is, the content of Co and Fe within the grain is much more than that at the grain boundary, but the content of Cr and W is more at the grain boundary.
Subjects
鈷基合金
胞狀晶
柱狀晶
Cobalt alloy
High frequency induction heating
Cellular dendrite
Columnar dendrite
Type
thesis
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