Study of abrasive wear resistance of Fe-based nanostructured hardfacing

A. GUALCO, E. SURIAN; H. G. SVOBODA

WEAR

ELSEVIER SCIENCE SA

Lugar: Amsterdam; Año: 2016 vol. 360 p. 14 - 20

0043-1648

In the last years several consumables which deposit hard nanostructured iron-based alloys with high resistanceto abrasive wear have been developed. The microstructure of the weld metal usually shows variations with thewelding procedure, particularly related to the heat input, number of layers and shielding gas type. The purposeof this work was to study the microstructural evolution and wear resistance of a nanostructured iron-based alloydeposited by FCAW process. Four samples with one and two layers were deposited under Ar-20%CO2 shieldingand without shielding gas, using a heat input of 3.5 kJ/mm. For each condition chemical composition wasdetermined and microstructure was studied using both optical and electronic microscopy and X ray diffraction.Microhardness and abrasive wear resistance were measured. The microhardness of the deposit was foundbetween 780 and 1020 HV2, depending on the number of layers. There was a variation of the chemicalcomposition between the first and the second layer. The wear test results were discussed in relation to chemicalcomposition, microstructure and microhardness.