Abstract
Stellite 6 alloy has excellent wear resistance, corrosion resistance, and oxidation resistance, however the difficulties in traditional processing limit its wide application. Additive manufacturing technology that has emerged in recent years is expected to provide a new way for the processing of stellite 6 alloy. In this study, two square thin-walled stellite 6 parts were fabricated through the wire arc additive manufacturing technology. At the same time, the effect of stress relief annealing on the mechanical performance of the fabricated stellite 6 part was studied and compared with the corresponding casting part. The results indicate that the additive manufacturing stellite 6 components exhibit satisfactory quality and appearance. Moreover, the microstructure of the additive manufacturing part is much finer than that of the casting part. From the substrate to the top region of the additive manufacturing part, the morphology of the dendrites changes from columnar to equiaxed, and the hardness increases firstly and then decreases gradually. In addition, the average hardness of the additive manufacturing part is ~7–8 HRC higher than the casting part. The ultimate tensile strength and yield strength is ~150MPa higher than the casting part, while the elongation is almost the same. The stress relief annealing has no significant effect on the hardness of the AM part, but it can slightly improve the strength.
Highlights
As a kind of cemented carbide, Co-based alloys have excellent wear resistance, thermal fatigue resistance, and corrosion resistance [1,2,3,4]
Two square parts were fabricated, and one for them is subjected to the stress relief annealing process
Thin-walled square parts were fabricated, and one for them is subjected to the stress relief annealing
Summary
As a kind of cemented carbide, Co-based alloys have excellent wear resistance, thermal fatigue resistance, and corrosion resistance [1,2,3,4]. Stellite 6 alloy is a typical Co-based alloy, and is widely used under extremely corrosive and wearing conditions, such as the aero engine, industrial gas turbine, and nuclear industries [5,6]. At the expense of the great physical and mechanical properties, stellite 6 alloy is difficult to be fabricated by traditional methods. Great efforts have been undertaken to investigate the coating and manufacturing methods of stellite 6 alloy. Aykut et al systematically investigated the tool wear, chip morphology and cutting force of the stellite alloy in face milling process [7]. It is shown that cutting force increases with the depth of cut and feed, but is independent of cutting speed
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