High-temperature hardness and wear resistance of stellite alloys

Abstract

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Sliding wear and solid-particle erosion resistance of a novel high-tungsten Stellite alloy

“…However, it is interesting to notice that although the new alloy has much larger volume fraction of carbides than Stellite 3, the overall hardness of the latter is higher, see Table 3. The hardness of Cr-rich and W-rich carbides in Stellite alloys was measured using a Microhardness Tester Unit, Model SMT-X7 Dual Indenter; it was reported that the former (HV1404) is slightly harder than the latter (HV1356) [15]. As shown in Table 2, most of the carbides in the new alloy are the W-rich carbides while those in Stellite 3 are the Cr-rich carbides.…”

“…The cavitation erosion study on Stellite 3, Stellite 6 and Stellite 20 demonstrated that Stellite 3 had the best resistance to erosion [11]. Similarly, the investigation of room-temperature and high-temperature sliding wear resistance of various Stellite alloys showed that Stellite 3 exhibited much better resistance to wear than Stellite 6 and Stellite 12 (CoCrW alloy containing 1.4 wt% C) at room temperature and also better wear resistance than Stellite 6 at elevated temperatures [15,16].…”

“…Because of its wide application, Stellite 6 has been extensively studied in various aspects of properties such as sliding wear on macro, micro and nano scale, cavitation erosion, solid-particle erosion, high-temperature sliding wear, etc. [7,[9][10][11][12][13][14][15][16][17]. Stellite 3, in the same category, but containing higher C (2.4 wt%) and more resistance to wear than Stellite 6, is the most commonly used for severe wear environments.…”

Investigations on high temperature wear and metallurgical characteristics of Stellite 6 GTA (Gas Tungsten Arc) weld claddings

“…Supersonic laser deposition has also been used for Stellite 6 surfacing [18][19][20]. Formation of oxide layer on the Stellite 6 coating surface and serving as a special lubricant during the wear test at high temperature and the formation of compact layers (glazes) resulting from the agglomeration of wear debris has been reported for this alloy [21,22]. The quality of cladding is largely dependent upon the term 'dilution' that is the most important aspect of any cladding or hardfacing procedure by welding.…”

Electrochemical Study of Corrosion Behavior of Stellite 6 Alloy and 17-4PH Stainless Steel in Amine Solutions

“…Therefore, the service life of a control valve relies significantly on the extent of seat face damage and the impact toughness of the hard-faced layer. Stellite 6 alloy has been popularly employed as the hardfacing material for the seat faces of various control valves due to its unique chemical composition of Co29Cr4.5W1.5Mo1.2C (in weight) and excellent combined mechanical, corrosion, wear, and high temperature properties [1][2][3]. It is frequently deposited with welding processes and laser cladding methods.…”