An Experimental Investigation and Analysis of PTAW Process

Mandal, Soumen; Kumar, Shailesh; Bhargava, Pankaj; Premsingh, C. H.; Paul, C. P.; Kukreja, L. M.

doi:10.1080/10426914.2014.984227

Cited by 19 publications

(4 citation statements)

References 18 publications

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“…To obtain the desired microstructure and mechanical properties of a hardfaced layer, selection of optimal PPTAW process parameters is a key step. The most reliable hardfaced layers are those configured and prepared to have the least surface defects, high rate of deposition, and less distortion, as well as low dilution [19]. The PPTAW process parameters -PGFR and plasma arc current -were varied to obtain information on their effects on the structure and properties of the hardfaced layers.…”

Section: Sample Preparationmentioning

confidence: 99%

Hardfacing of mild steel with wear-resistant Ni-based powders containing tungsten carbide particles using powder plasma transferred arc welding technology

Appiah

Bialas

Żuk

et al. 2022

Materials Science-Poland

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This study explores the use of powder plasma transferred arc welding (PPTAW) as a surface layer deposition technology to form hardfaced coatings to improve upon the wear resistance of mild steel. Hardfaced layers were prepared using the PPTAW process with two different wear-resistant powders: PG 6503 (NiSiB + 60% WC) and PE 8214 (NiCrSiB + 45% WC). By varying the PPTAW process parameters of plasma gas flow rate (PGFR) and plasma arc current, hardfaced layers were prepared. Microscopic examinations, penetration tests, hardness tests, and abrasive wear resistance tests were carried out on the prepared samples. Hardfacings prepared with PG 6503 had a hardness of 46.3–48.3 HRC, while those prepared with PE 8214 had a hardness of 52.7–58.3 HRC. The microhardness of the matrix material was in the range of 573.3–893.0 HV, while that of the carbides was in the range of 2128.7–2436.3 HV. The abrasive wear resistance of the mild steel was improved after deposition of hardfaced layers by up to 5.7 times that of abrasion-resistant heat-treated steel, Hardox 400, having a nominal hardness of approximately 400 HV. The hardness and wear resistance were increased upon addition of Cr as an alloying element. Increasing the PGFR increased the hardness and wear resistance of the hardfacings, as well as increasing the number of surface cracks. Increasing the plasma transferred arc (PTA) current resulted in hardfacings with fewer cracks but lowered the wear resistance.

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Section: Sample Preparationmentioning

confidence: 99%

Hardfacing of mild steel with wear-resistant Ni-based powders containing tungsten carbide particles using powder plasma transferred arc welding technology

Appiah

Bialas

Żuk

et al. 2022

Materials Science-Poland

View full text Add to dashboard Cite

show abstract

“…To obtain the desired microstructure and mechanical properties of a hardfaced layer, selection of optimal PPTAW process parameters is an important step. The most reliable hardfaced layers are those configured and prepared to have the least surface defects, high rate of deposition, less distortion as well as low dilution [14]. The PPTAW process parameters -PGFR and plasma arc current -were varied to obtain information on their effects on the structure and properties of the hardfaced layers.…”

Section: Sample Preparationmentioning

confidence: 99%

Hardfacing of mild steel with wear-resistant Ni-based powders containing WC particles using PPTAW technology

Appiah,

Bialas,

Jędrzejczyk

et al. 2022

Weld. Tech. Rev.

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This study explores the use of powder plasma transferred arc welding (PPTAW) as a surface layers deposition technology to form hardfaced coatings to improve upon the wear resistance of non-alloy structural steel. Hardfaced layers/coatings were prepared using the PPTAW process with two different wear-resistant powders: PG 6503 (NiSiB+60% WC) and PE 8214 (NiCrSiB+45% WC). By varying the PPTAW process parameters of plasma gas flow rate (PGFR) and plasma arc current, hardfaced layers were prepared. Microscopic examinations were carried out to ascertain information about the microstructure and surface characteristics of the prepared hardfaced layers. Penetration tests were performed to ascertain the number and depth of crack sites in the prepared samples by visual inspection. Hardness tests were also performed to determine the microhardness of the prepared hardfaced layers. Abrasive wear resistance tests were carried out on each prepared sample to determine their relative abrasive wear resistance relative to the reference material, abrasion resistant heat-treated steel having a nominal hardness of 400 HBW. The effects of the variations of PGFR and plasma arc current on the microstructure and mechanical properties of the coatings, and the wear mechanisms were discussed.

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“…According to the indentation fracture mechanics model, the minimum of single abrasive particle critical load which produces cracks can be represented as P l *(N) [24]:…”

Section: Single Abrasive Particle Average Cutting Depthmentioning

confidence: 99%

Drilling Mechanism Investigation on SiC Ceramic Using Diamond Bits

Gao¹,

Wu²,

Wang³

2017

TOMEJ

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Background: SiC ceramic have been widely used in the fields of armor protection, but SiC ceramic is one of the difficult-to-machine material for its high hardness and low fracture toughness. Objective: This paper presents an investigation of drilling mechanism on SiC ceramic using diamond bits. Method: Based on the theory of indentation fracture mechanics model, cutting average load model and cutting average depth model for single particle were established, theory analysis of drilling mechanism was carried out; through scanning electron microscope (SEM) observation, experimental removal mechanism was discussed. Results and Conclusions: The results show that, brittle fracture is the dominant way for SiC ceramic’s removal mechanism, plastic deformation always exists during the drilling process. Brittle fracture includes cleavage fracture, transgranular fracture, intergranular fracture, material peeling off and grain boundary breakage; resintering and recrystallization happen under the joint action of grinding forces and grinding heat in the contact area, where plastic flow characteristics also appear; powdering removal is accompanied by the drilling process; cleavage fracture and transgranular fracture occur on intergranular pores and grain boundary; residual cracks are found in the drilling surface resulted by drilling stress and high temperature.

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An Experimental Investigation and Analysis of PTAW Process

Cited by 19 publications

References 18 publications

Hardfacing of mild steel with wear-resistant Ni-based powders containing tungsten carbide particles using powder plasma transferred arc welding technology

Hardfacing of mild steel with wear-resistant Ni-based powders containing tungsten carbide particles using powder plasma transferred arc welding technology

Hardfacing of mild steel with wear-resistant Ni-based powders containing WC particles using PPTAW technology

Drilling Mechanism Investigation on SiC Ceramic Using Diamond Bits

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