Solid state Stellite6 coatings were deposited on steel substrate by friction surfacing and compared with Stellite6 cast rod and coatings deposited by gas tungsten arc and plasma transferred arc welding processes. Friction surfaced coatings exhibited finer and uniformly distributed carbides and were characterized by the absence of solidification structure and compositional homogeneity compared to cast rod, gas tungsten arc and plasma transferred coatings. Friction surfaced coating showed relatively higher hardness. X-ray diffraction of samples showed only face centered cubic Co peaks while cold worked coating showed hexagonally close packed Co also. © 2012 Elsevier Inc. All rights reserved.

Janaki Ram G D

Department of Metallurgical and Materials Engineering

Close packed

Cold worked

COMPOSITIONAL HOMOGENEITY

Face-centered cubic

FRICTION SURFACING

Gas tungsten arc

PLASMA TRANSFERRED ARC WELDING

SOLIDIFICATION STRUCTURE

STEEL SUBSTRATE

STELLITE 6

Carbides

Friction

Friction welding

Gas metal arc welding

tribology

X ray diffraction

Coatings

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Materials Characterization

Cold metal transfer (CMT) welding is a new gas metal arc welding process having several advantages such as low heat input and spatter free welding. This makes it of great advantage in weld cladding applications. In this study, hardfacing of AISI H13 die steel with Stellite 21 alloy has been carried using CMT process. Coatings were deposited on H13 substrate in annealed as well as quenched & tempered (Q&T) condition at room temperature as well as with a preheat of 400 °C. The Q&T substrate with and without preheat and the annealed substrate without preheat were found to be susceptible to underbead cracking upon Stellite deposition. The cracking in the heat affected zone (HAZ) was due to formation of brittle martensite upon rapid cooling which is associated with formation of high tensile residual stresses at the bead toe. The annealed substrate with preheat of 400 °C showed the least cracking tendency. The cracking tendency was investigated by studying the variation of the microstructure and microhardness along the depth of HAZ. The dilution levels based on Fe content was found to be 3–4%, which was considerably lower than that of conventional arc welding deposits. The Stellite coated H13 plate (annealed with preheat) could be successfully subjected to quenching & tempering heat treatment to restore the properties of the substrate without introducing any defects. © 2017 Elsevier B.V.

Surface and Coatings Technology

Hardfacing of AISI H13 tool steel with Stellite 21 alloy using cold metal transfer welding process

Materials Science and Engineering: A

Evolution of cold-rolled microstructures of biomedical Co-Cr-Mo alloys with and without N doping

Scripta Materialia

Hot working characteristics of cobalt in the temperature range 600–950°C

Surface Engineering

Friction surfacing: novel technique for metal matrix composite coating on aluminium–silicon alloy

Materials & Design

Optimization of process parameters for deposition of Stellite on X45CrSi93 steel by plasma transferred arc technique

Comparison between diode laser and TIG cladding of Co-based alloys on the SUS403 stainless steel

Friction surfaced Stellite6 coatings

Journal	Materials Characterization
ISSN	10445803
Open Access	No