Feasibility of laminar plasma-jet hardening of cast iron surface

Nontransferred DC laminar plasma jets of stable flow and low impinging pressure acting on the substrate were used to heat W–Mo–Cu cast iron for phase transfer hardening of the surface layer. Substrates were heated in multipass with or without overlapping or heated with only single-pass. Surface morp...

Full description

Saved in:
Bibliographic Details
Published in:Surface & coatings technology 2005-07, Vol.197 (2), p.345-350
Main Authors: Pan, W.X., Meng, X., Li, G., Fei, Q.X., Wu, C.K.
Format: Article
Language:English
Subjects:
Cast iron
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Laminar plasma jets
Materials science
Other topics in materials science
Physics
Stable heating
Surface hardening
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Nontransferred DC laminar plasma jets of stable flow and low impinging pressure acting on the substrate were used to heat W–Mo–Cu cast iron for phase transfer hardening of the surface layer. Substrates were heated in multipass with or without overlapping or heated with only single-pass. Surface morphologies of the molten trace and microstructure of the cross-section were observed, and the hardness distribution of the treated surface layer was examined. The surface layer of single-pass-heated specimen has an average hardness of about 900 HV 0.1, while the specimen treated with multipass shows an average hardness of about 700 HV 0.1, because of the heat effect from the neighboring pass treating, compared with the substrate hardness of about 300 HV 0.1. The results demonstrate the stable and favorably controlled heating of the laminar plasma jet on the substrate surface and feasibility of using it as a tool for surface hardening of cast iron.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2004.06.043