Preparations of iron-based alloy coatings on grey cast iron through plasma transfer arc welding

Gao, Peihu; Chen, Bai-yang; Zhang, Bo; Yang, Zhong; Guo, Ya-Fang; Li, Jianping; Liang, Minxian; Li, Quan-Ping

doi:10.1080/01694243.2021.1940656

Cited by 7 publications

(5 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Good metallurgical bonding occurred between the ironbased alloy coating and the CGI substrate. A transition zone with a little flake graphite appeared when a single-pass cladded iron-based coating was formed on the grey cast iron, as reported in previous work [33]. In the single-pass cladding, the carbon atoms hardly diffused to form graphite under the huge cooling rate, whereas, in the multiple claddings process, the heat capacity of the deposited cladding was large and the cooling rate decreased, which would be helpful to precipitate carbon in the transition zone.…”

Section: Mirostructure Of the Bonding Zonesupporting

confidence: 81%

Wear Properties of Iron-Based Alloy Coatings Prepared by Plasma Transfer Arc Cladding

et al. 2022

Self Cite

View full text Add to dashboard Cite

Plasma transfer arc cladding technology has been widely utilized in surface engineering, repairing and remanufacturing. In the present work, multiple cladded thick claddings were prepared on compacted graphite cast iron (CGI) substrates with iron-based powders through plasma transfer arc cladding technology using different plasma arc currents to improve the surface wear resistance. The coatings’ phase and microstructure were analysed through XRD, SEM and EDS. The coatings’ microhardness and wear resistance were characterized. There were pearlite, graphite, austenite and secondary carbides in the iron-based alloy coatings. Due to the heat influence during the multiple cladding process, a spheroidal graphite transition zone appeared between the substrate and the coating. The microhardness of the claddings varied from 363 to 402 HV as the plasma arc current was changed from 45 to 60 A. With the increase of plasma arc current, the cladding’s microhardness increased. The iron-based coating’s minimum friction coefficient and wear mass loss were about 0.48 and 4.2 mg, respectively, when the plasma arc current was 60 A, which are lower values than those of the compacted graphite iron substrate with the friction coefficient and wear mass loss of 0.55 and 8.2 mg. Compared with the substrate, the iron-based alloy claddings achieved the effect of reducing friction and wear resistance simultaneously, which resulted from the self-lubricating effect of graphite and high wear-resistance of carbides in the claddings. The iron-based coatings had a similar abrasive wear mechanism to the CGI, which should be helpful to repair or remanufacture CGI workpieces.

show abstract

Section: Mirostructure Of the Bonding Zonesupporting

confidence: 81%

Wear Properties of Iron-Based Alloy Coatings Prepared by Plasma Transfer Arc Cladding

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…In the bonding zone (BZ), there were comixed CoCrFeNiMn HEA solid solutions, ledeburite (L) and fine acicular martensite (M) formed near the grey cast iron for some parts remelted at fast heating and cooling speed on the surface of the grey cast iron during plasma transfer arc cladding, which led to a great increase of the microhardness in the bonding zone (BZ). Meanwhile, in the heat affected zone (HAZ), the pearlite (P) in the grey cast iron substrate was heated and cooled quickly and changed to martensite (M) with high hardness, which had been previously reported [32,33].…”

Section: Microhardnessmentioning

confidence: 95%

Corrosion Resistance of CoCrFeNiMn High Entropy Alloy Coating Prepared through Plasma Transfer Arc Claddings

Gao

Chen

et al. 2021

Metals

Self Cite

View full text Add to dashboard Cite

High entropy alloy attracts great attention for its high thermal stability and corrosion resistance. A CoCrFeNiMn high-entropy alloy coating was deposited on grey cast iron through plasma transfer arc cladding. It formed fine acicular martensite near the grey cast iron, with columnar grains perpendicular to the interface between the grey cast iron substrate and the cladding layer as well as dendrite in the middle part of the coatings. Simple FCC solid solutions present in the coatings which were similar to the powder’s structure. The coating had a microhardness of 300 ± 21.5 HV0.2 when the cladding current was 80 A for the solid solution strengthening. The HEA coating had the highest corrosion potential of −0.253 V when the plasma current was 60 A, which was much higher than the grey cast iron’s corrosion potential of −0.708 V. Meanwhile, the coating had a much lower corrosion current density of 9.075 × 10−7 mA/cm2 than the grey cast iron’s 2.4825 × 10−6 mA/cm2, which reflected that the CoCrFeNiMn HEA coating had much better corrosion resistance and lower corrosion rate than the grey cast iron for single FCC solid solution phase and a relatively higher concentration of Cr in the grain boundaries than in the grains and this could lead to corrosion protection effects.

show abstract

“…At an equivalent time, the friction heat promoted the formation of associated oxide film on the surface of the coating, and these oxide films have a certain self-lubricating ability, which led to a slight decrease of the frictional coefficient. Oxide film in the wear process continues to experience the formation and destruction, once this dynamic cycle reaches equilibrium, the frictional resistance between the coating and the counterpart will be maintained at a constant value, the coefficient of friction will also tend to stabilize [43]. The fluctuations that existed within the stable section of the frictional coefficient were primarily associated with instrument vibration and measuring accuracy.…”

Section: Wear Resistancementioning

confidence: 99%

Effect of Heat Treatment on the Microstructure and Mechanical Properties of Plasma Cladded CoCrFeNiMn Coatings on Compacted Graphite Iron

Zhang,

Fu,

Gao

et al. 2024

Preprint

View full text Add to dashboard Cite

CoCrFeNiMn high-entropy alloy coatings were prepared on compacted graphite iron（CGI） through plasma cladding to strength the CGI substrate. The effects of heat treatment temperatures and times on the microstructure and mechanical properties of the CoCrFeNiMn coatings were investigated. After heat treatment, a single FCC phase was remained in the coating as compared to the deposited one, with smaller dendrites, larger dendritic spacing and more Cr-rich compounds precipitated between dendrites. The coatings’ microhardness was increased after heat treatment. After heat treated at 660°C for 90 minutes, the coating had the highest microhardness of 563±6.9 HV0.2, the lowest frictional coefficient of 0.71 and the smallest wear mass loss of 1.12 mg, and it had the best wear resistance.

show abstract

Preparations of iron-based alloy coatings on grey cast iron through plasma transfer arc welding

Cited by 7 publications

References 22 publications

Wear Properties of Iron-Based Alloy Coatings Prepared by Plasma Transfer Arc Cladding

Wear Properties of Iron-Based Alloy Coatings Prepared by Plasma Transfer Arc Cladding

Corrosion Resistance of CoCrFeNiMn High Entropy Alloy Coating Prepared through Plasma Transfer Arc Claddings

Effect of Heat Treatment on the Microstructure and Mechanical Properties of Plasma Cladded CoCrFeNiMn Coatings on Compacted Graphite Iron

Contact Info

Product

Resources

About