Browsing by Subject "Vickers hardness testing"

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    The effects of conventional heat treatment and boronizing on abrasive wear and corrosion of SAE 1010, SAE 1040, D2 and 304 steels
    (2003) Atik E.; Yunker U.; Meriç C.
    The effects of conventional heat treatment and boronizing on SAE 1010 and SAE 1040 structural steels, D2 tool steel, and 304 stainless steel were investigated. During this investigation, layer thicknesses, corrosion and wear strength were examined by applying carburisation, nitriding, transformation hardening and boronizing to the specimens. Abrasive wear tests were carried out in a wear cup model device. Sand of 1 mm diameter was used and the test duration was 40 hours with a velocity 0.157 m/s. Corrosion tests were undertaken in a 10% H2SO4 solution at a temperature of 56°C. Through metallographic analyses, hard layer thicknesses and Vickers hardness values were determined for each hardening treatment. © 2002 Published by Elsevier Science Ltd.
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    Age-hardening behavior of powder metallurgy AA2014 alloy
    (Elsevier Ltd, 2007) Durmuş H.K.; Meriç C.
    The aim of this paper is to investigate age hardening behavior of PM AA2014 alloy. The specimens were made by powder metallurgy (PM) method. During the PM the product was made from powder basic materials by pressing (at 600 MPa) and sintering (600 ± 5 °C, 610 ± 5 °C, 620 ± 5 °C). There were three steps that occur in age-hardening; solution treatment (510 ± 5 °C), quenching (water) and aging (20 °C, 150 ± 5 °C, 200 ± 5 °C). Metal microscopy and micro Vickers hardness test were carried out to characterize the structure properties resulting from different aging temperature. The hardness test results showed that the sintering temperature, suitable solution treatment and aging operations has great influence on hardness characteristics of the PM alloys. © 2005 Elsevier Ltd. All rights reserved.
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    Reliability evaluation of hardness test methods of hardfacing coatings with hypoeutectic and hypereutectic microstructures
    (University of Science and Technology Beijing, 2019) Çömez N.; Çivi C.; Durmuş H.
    Hardfacing coatings involve hard carbide/boride phases dispersed in a relatively soft steel matrix. For the hardness measurements of hardfacing coatings, depending on the micro structure, both the hardness test method and the applied load affect the hardness results; therefore, they affect the wear performance predictions of the coating. For this reason, the proper hardness test method should be determined according to the microstructure of the coating, and the reliability of the obtained hardness data should be established. This study aimed to determine the most suitable hardness test method for hypoeutectic and hypereutectic microstructures of hardfacing coatings by analyzing the reliability of Rockwell-C and Vickers hardness test results. Reliability analyses showed that Rockwell-C is not a suitable hardness test method for hypereutectic hardfacing coatings. Based on the relationship between wear resistance and hardness, Vickers hardness method was found more suitable for the considered materials. © 2019, University of Science and Technology Beijing and Springer-Verlag GmbH Germany, part of Springer Nature.