Coating of AISI 4340 low-alloy steel with austenitic stainless steels and stellite6 cobalt base by tungsten-gas arc welding method and investigation of the microstructure and wear behavior of the resulting layer

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Nabavinejad Nasser; Alaei Alireza; Basir Pouya

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Journal Paper

Paper Information

Journal: JOURNAL OF MECHANICAL ENGINEERING AMIRKABIR (AMIRKABIR) Year:2023 | Volume:55 | Issue:6 Page(s): 773-794

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Information Journal Paper

Title

Coating of AISI 4340 low-alloy steel with austenitic stainless steels and stellite6 cobalt base by tungsten-gas arc welding method and investigation of the microstructure and wear behavior of the resulting layer

Author(s)

Nabavinejad Nasser | Alaei Alireza | Basir Pouya | Issue Writer Certificate

Keywords

CladdingQ4

AISI 4340 alloyQ4

gas tungsten arc weldingQ4

wearQ4

MicrostructureQ4

Abstract

In this research, the Microstructure and wear behavior of high-strength AISI 4340 low-alloy steel coated using austenitic stainless steels ER309, ER312, and cobalt base steel stellite 6 were investigated by tungsten-gas arc welding method. Microstructural investigations were carried out by optical microscope and scanning electron microscope equipped with X-ray energy diffraction spectroscopy system(EDS). Hardness measurement was done by the Vickers method with a load of 30kgf on the surfaces and Vickers microhardness in the transverse sections of the welds in zigzag form. Also, To evaluate the wear behavior, the wear test of the pin on the disc was used to identify the wear mechanism. the highest hardness was related to stellite 6 by the amount of 565(HV), the reason for this increase in hardness is the presence of carbide phases M23C6 and M7C3 as well as chromium-tungsten complex carbides among bright cobalt dendrites. The results of the wear test showed that the highest friction coefficient was related to ER309 weld metal has an average value of 0.68 and the lowest friction coefficient is related to stellite 6 weld metal with an average value of 0.53.

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