Enhancement of wear resistance of ductile iron surface alloyed by stellite 6

Jeshvaghani, R. Arabi; Shamanian, M.; Jaberzadeh, M.

doi:10.1016/j.matdes.2010.11.060

Cited by 87 publications

(21 citation statements)

References 21 publications

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“…3 The microhardness reduction obtained for ST-Glazing (17%) is substantially lower compared to the findings of Ciubotariu (Ref 18) and Sidhu (Ref 11,12) who reported 44 and 50% decreases in microhardness after laser glazing of HVOF-sprayed and APS-sprayed Stellite 6 coatings, respectively. Their observations revealed that laser glazing causes the entire coating and also a part of the substrate to be remelted, resulting in a severe dilution of coating and significant microhardness reduction.…”

Section: Microhardnessmentioning

confidence: 63%

“…Chromium not only provides corrosion and oxidation resistance through chromium oxide formation, but also contributes to the hardening of Stellite 6 alloy by the development of chromium carbides. Tungsten and molybdenum are solid solution hardening elements and increase the mechanical strength of Stellite 6 through precipitation of carbide and intermetallic phases (Ref [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

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Laser Surface Treatment of Stellite 6 Coating Deposited by HVOF on 316L Alloy

Razavi

2016

J. of Materi Eng and Perform

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This research aimed to study the effects of laser glazing treatment on microstructure, hardness, and oxidation behavior of Stellite 6 coating deposited by high velocity oxygen fuel (HVOF) spraying. The assprayed Stellite 6 coating (ST-HVOF) was subjected to single-pass and multiple-pass laser treatments to achieve the optimum glazing parameters. Microstructural characterizations were performed by x-ray diffractometry and field emission scanning electron microscopy equipped with energy-dispersive spectroscopy. Two-step optimization showed that laser treatment at the power of 200 W with a scan rate of 4 mm/s causes a surface layer with a thickness of 208 ± 32 lm to be remelted, while the underlying layers retain the original ST-HVOF coating structure. The obtained sample (ST-Glazing) exhibited a highly dense and uniform structure with an extremely low porosity of $0.3%, much lower than that of ST-HVOF coating (2.3%). The average microhardness of ST-Glazing was measured to be 519 Hv 0.3 indicating a 17% decrease compared to ST-HVOF (625 Hv 0.3 ) due to the residual stress relief and dendrite coarsening from submicron size to $3.4 lm after laser treatment. The lowest oxidation mass gain was obtained for STGlazing by 2 mg/cm 2 after 8 cycles at 900°C indicating 52 and 84% improvement in oxidation resistance in comparison to ST-HVOF and bare 316L steel substrates, respectively.

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Section: Microhardnessmentioning

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Laser Surface Treatment of Stellite 6 Coating Deposited by HVOF on 316L Alloy

Razavi

2016

J. of Materi Eng and Perform

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“…Accordingly, this alloy has been studied the most extensively among Stellite alloys. [6][7][8][9][10][11] Stellite 3 is a higher grade of Stellite 6 with double C content for enhancing wear resistance. [3,12] In CoCrMo system, traditional alloys contain very low C content (<0.25 wt pct) for high temperature-and corrosion-resistant applications.…”

Section: Introductionmentioning

confidence: 99%

Microstructures and Hardness/Wear Performance of High-Carbon Stellite Alloys Containing Molybdenum

Liu

Yao

Zhang

et al. 2015

Metall Mater Trans A

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Conventional high-carbon Stellite alloys contain a certain amount of tungsten which mainly serves to provide strengthening to the solid solution matrix. These alloys are designed for combating severe wear. High-carbon molybdenum-containing Stellite alloys are newly developed 700 series of Stellite family, with molybdenum replacing tungsten, which are particularly employed in severe wear condition with corrosion also involved. Three high-carbon Stellite alloys, designated as Stellite 706, Stellite 712, and Stellite 720, with different carbon and molybdenum contents, are studied experimentally in this research, focusing on microstructure and phases, hardness, and wear resistance, using SEM/EDX/XRD techniques, a Rockwell hardness tester, and a pin-on-disk tribometer. It is found that both carbon and molybdenum contents influence the microstructures of these alloys significantly. The former determines the volume fraction of carbides in the alloys, and the latter governs the amount of molybdenum-rich carbides precipitated in the alloys. The hardness and wear resistance of these alloys are increased with the carbide volume fraction. However, with the same or similar carbon content, high-carbon CoCrMo Stellite alloys exhibit worse wear resistance than high-carbon CoCrW Stellite alloys.

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“…In fact, nickel is able to dissolve graphite contained in the DCI parent metal, germinating as low average size spherulites, preventing the formation of martensite or fragile carbides and promoting a more uniform weldment structure with the ability to deform without cracking. Welds performed with FM based on Ni alloys have given an advantage in the last decade [27,28], due to the microstructure achieved, mainly composed of Ni-rich solid solution dendrites together with some M23C6 carbides interdendritic eutectics [1]. Studies carried out by Pascual et al [18] allowed us to observe that ductility is improved when stainless steel or Ni-Fe alloys are used as FM in DCI welding relative to gray iron FM, which presents the worse results in terms of mechanical properties.…”

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confidence: 99%

Comparing the Structure and Mechanical Properties of Welds on Ductile Cast Iron (700 MPa) under Different Heat Treatment Conditions

Gouveia

Silva

Paiva

et al. 2018

Metals

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Abstract:The weldability of ductile iron, as widely known, is relatively poor, essentially due to its typical carbon equivalent value. The present study was developed surrounding the heat treatability of welded joints made with a high strength ductile cast iron detaining an ultimate tensile strength of 700 MPa, and aims to determine which heat treatment procedures promote the best results, in terms of microstructure and mechanical properties. These types of alloys are suitable for the automotive industry, as they allow engineers to reduce the thickness of parts while maintaining mechanical strength, decreasing the global weight of vehicles and providing a path for more sustainable development. The results allow us to conclude that heat treatment methodology has a large impact on the mechanical properties of welded joints created from the study material. However, the thermal cycles suffered during welding promote the formation of ledeburite areas near the weld joint. This situation could possibly be dealt through the implementation of post-welding heat treatments (PWHT) with specific parameters. In contrast to a ductile cast iron tested in a previous work, the bull-eye ductile cast iron with 700 MPa ultimate tensile strength presented better results during the post-welding heat treatment than during preheating.

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Enhancement of wear resistance of ductile iron surface alloyed by stellite 6

Cited by 87 publications

References 21 publications

Laser Surface Treatment of Stellite 6 Coating Deposited by HVOF on 316L Alloy

Laser Surface Treatment of Stellite 6 Coating Deposited by HVOF on 316L Alloy

Microstructures and Hardness/Wear Performance of High-Carbon Stellite Alloys Containing Molybdenum

Comparing the Structure and Mechanical Properties of Welds on Ductile Cast Iron (700 MPa) under Different Heat Treatment Conditions

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