Effect of scanning speed during PTA remelting treatment on the microstructure and wear resistance of nodular cast iron

Cao, Huatang; Dong, Xiaojuan; Huang, Qingjiu; Pan, Zhejun; Li, Jianjun; Zhao, Fan

doi:10.1007/s12613-014-0917-6

Cited by 19 publications

(17 citation statements)

References 17 publications

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“…Thereafter a homemade plasma beam apparatus was employed as a heating source to produce the coatings due to its advantages of high energy efficiency, the feasibility of working in an air atmosphere and competitive running costs [1,33,34]. For more details about the plasma apparatus reference is made to [35]. Details of the processing parameters are listed in Table 1.…”

Section: Materials Preparationsmentioning

confidence: 99%

Hard-yet-tough high-vanadium hierarchical composite coating: Microstructure and mechanical properties

Cao

Dong

Chabok

et al. 2018

Materials Science and Engineering: A

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In this work, we report a high-vanadium hierarchical coating prepared on the surface of nodular cast iron substrate by a low-cost plasma transferred arc (PTA) surface alloying process. The coating consists of a graded layer with an alloyed zone (AZ) rich in submicron sized granular (V-Ti-Nb-Cr-Mo) composite carbides on top of intermediate melted zone characterized by refined ledeburite and martensite. The dense spherical particles in the AZ are FCC structured MC-type (M = V, Ti and Nb) carbides which tend to aggregate while M 7 C 3 and M 2 C carbides nucleate on MC. The super-lattice V 8 C 7 maintains its cube-on-cube orientation relationship with TiC. The hardness of the AZ is 9.6 ± 1.0 GPa,~4 times that of the substrate. Nano-and micro-indentations point at a superior strength-toughness in the AZ, where cracks are deflected and bridged by the spherical MC carbides in a compressive residue stress state. The fracture mode appears to be rather ductile in the AZ whereas brittle failure appears in both the melted zone and substrate. TEM and EDS results confirm that such a microarchitecture design, assisted by the rapid solidification rate of the PTA process, concurrently activates various strengthening micromechanisms including the precipitation hardening and grain refinement.

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Section: Materials Preparationsmentioning

confidence: 99%

Hard-yet-tough high-vanadium hierarchical composite coating: Microstructure and mechanical properties

Cao

Dong

Chabok

et al. 2018

Materials Science and Engineering: A

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“…These parts are often scrapped owing to the wear and tear of work surfaces after a long working time. Traditional surface treatment technologies, such as nitriding, carburizing, thermal spraying, 1,2 and remelting [3][4][5] are usually used to improve the wear resistance of these parts' working surface and have vast applications. However, these technologies have some limitations for the scrapped parts with a certain remaining service life.…”

Section: Introductionmentioning

confidence: 99%

Remanufacturing of nodular cast iron crankshaft with plasma cladding

Liu

et al. 2018

Advances in Mechanical Engineering

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Remanufacturing technology has a wide range of applications in the repair of scrapped parts with a certain remaining service life. In this work, a scrapped crankshaft fabricated from nodular cast iron that had failed from working surface wear was remanufactured via a plasma cladding process. Taking into account the wear amount on the working surface and the characteristics of nodular cast iron, in this article, cladding layer parameters were designed and two types cladding powders, Fe-based and Ni-based, were prepared, respectively, to perform the cladding experiment. After examining different process parameters, relatively smooth cladding layers were obtained using four powders. The cladding experiment results showed that the powder No. 3 exhibited superior qualities when combined with proper processing parameters. When applying powder No. 3 to the main journal of crankshaft, a higher quality of cladding layer was achieved.

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“…Ductile iron (DI) is widely used in a broad range of industrial applications such as machine tool beds, dies, punches, cylinders, etc., owing to its low production cost combined with favorable properties like machinability, excellent castability and comprehensive strength-toughness [1][2][3]. However, in harsh service circumstances like those in mining and rolling sectors, the low hardness and poor wear resistance limit its further industrial applications.…”

Section: Introductionmentioning

confidence: 99%

“…Powders were mechanically blended and pre-coated onto polished DI substrate to form a layer of ~25 μm thickness. PTA process was performed by a home-made atmospheric plasma apparatus that has been detailed in elsewhere [3]. The plasma beam diameter, the current, the working distance, the scanning speed and overlapping rate were 4 mm, 100 A, 2 mm, 1.6 m min -1 and 25%, respectively.…”

Section: Introductionmentioning

confidence: 99%

Hard-yet-tough high-vanadium high-speed steel composite coating in-situ alloyed on ductile iron by atmospheric plasma arc

2017

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Hard-yet-tough high-vanadium high-speed steel composite coating in-situ alloyed on ductile iron by atmospheric plasma arc Cao, Huatang; Dong, Xuanpu; Pei, Yutao T. Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. H. Cao, et al., Int. J. Comp. Meth. and Exp. Meas., Vol. 6, No. 3 (2018) ABSTRACT A graded high-vanadium alloy composite coating was synthesized from premixed powders (V, Cr, Ti, Mo, Nb) on ductile iron (DI) substrate via atmospheric plasma arc surface alloying process. The resulted cross-section microstructure is divided into three distinct zones: upper alloyed zone (AZ) rich with spherical primary carbides, middle melted zone (MZ) with fine white iron structure and lower heat affected zone (HAZ). Spherical or bulk-like primary carbides with diameter < 1 μm in the AZ are formed via in-situ reactions between alloy powders and graphite in DI. Microstructural characterizations indicate that the carbides are primarily MC-type (M=V, Ti, Nb) carbides combined with mixed hardphases such as M 2 C, M 7 C 3 , M 23 C 6 , and martensite. Disperse distribution of spherical, submicron-sized metal carbides in an austenite/ledeburite matrix render the graded coating hard-yet-tough. The maximum microhardness of the upper alloyed zone is 950 HV 0.2 , which is five times that of the substrate. Significant plastic deformation with no cracking in the micro-indentations points to a high toughness. The graded high-vanadium alloy composite coating exhibits superior tribological performance in comparison to Mn13 steel and plasma transferred arc remelted DI.

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Effect of scanning speed during PTA remelting treatment on the microstructure and wear resistance of nodular cast iron

Cited by 19 publications

References 17 publications

Hard-yet-tough high-vanadium hierarchical composite coating: Microstructure and mechanical properties

Hard-yet-tough high-vanadium hierarchical composite coating: Microstructure and mechanical properties

Remanufacturing of nodular cast iron crankshaft with plasma cladding

Hard-yet-tough high-vanadium high-speed steel composite coating in-situ alloyed on ductile iron by atmospheric plasma arc

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