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Characterisation of weld deposits using as filler metal a high entropy alloy

I. VOICULESCU1,* , V. GEANTA1,* , I. M. VASILE1, R. STEFANOIU1, M. TONOIU1

Affiliation

  1. Politehnica University of Bucharest, 313, Splaiul Independentei, 060042, Bucharest, Romania

Abstract

The concept "hyperentropic alloys" refers to the development of one special metal matrix in which all the chemical elements participate in molar equivalent reports, without one of them to be the matrix. Such alloys have special characteristics such as high hardness combined with toughness and plasticity, which can be obtained depending on the constituents and thermal regime applied after elaboration. In this paper we present some results obtained as welding deposition of a hyperentropic alloy, upon unalloyed steel support (S 275 J2). The weld deposition has been heat treated of aging annealing at 600 °C and 900 oC for 4 and 6 hours. To reveal microstructural aspects were analyzed welded areas, by optical and electronical microscopy and then were made microhardness measurements. It was found that by the fast cooling of hyperentropic alloys it can achieve high values of hardness but low plasticity, and by applying heat treatments, can be obtained different pairs of hardness and plasticity, depending on the dedicated application. The hardness values of weld deposit are 3.5 times higher than those of the base material, without cause hardening of heat affected zone..

Keywords

Weld deposit, Filler metal, High entropy alloy, Microhardness.

Submitted at: March 25, 2013
Accepted at: July 11, 2013

Citation

I. VOICULESCU, V. GEANTA, I. M. VASILE, R. STEFANOIU, M. TONOIU, Characterisation of weld deposits using as filler metal a high entropy alloy, Journal of Optoelectronics and Advanced Materials Vol. 15, Iss. 7-8, pp. 650-654 (2013)