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

Abstract

Iron-based alloy coatings were deposited on grey cast iron through plasma transfer arc welding. Results showed that the iron-based alloy coatings are composed of pearlite, martensite, austenite, and secondary carbides. There formed a bonding transformation layer between coating and grey cast iron with the width of about 205 μm. The optimized plasma transfer arc current was 100 A with the coating’s microhardness of 749 Hv. Meanwhile, the bonding strength between the deposit and the grey cast iron was 208 MPa which was comparable to the grey cast iron’s strength. The thick coatings with similar properties to the grey cast iron formed the basis of remanufacturing grey cast iron parts.

Keywords:

• Coating
• plasma transfer arc welding
• grey cast iron
• adhesion strength

Disclosure statement

The authors declare no conflict of interest.

Additional information

Funding

This work was funded by the National Natural Science Foundation of China (51771140), Key Project of Equipment Pre-search Field Fund (6140922010301), Shaanxi Key Science and Technology Innovation Team (2017KCT-05), The Youth Innovation Team of Shaanxi Universities: Metal Corrosion Protection and Surface Engineering Technology, Shaanxi Provincial Key Research and Development Project (2019ZDLGY05-09), Local Serving Special Scientific Research Projects of Shaanxi Provincial Department of Education (19JC022), Project of Yulin Science and Technology Bureau (2019-121).