Open AccessEffect of austempering temperatures on surface hardness of AISI 4140 steel
Author(s) -
Mohammad Badaruddin,
B Bakti,
Bayu Handika Prasetyo,
. Sugiyanto
Publication year - 2021
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1173/1/012027
Subject(s) - austempering , materials science , microstructure , metallurgy , hardness , bainite , pearlite , indentation hardness , vickers hardness test , rod , piston (optics) , composite material , martensite , austenite , medicine , alternative medicine , physics , pathology , wavefront , optics
AISI 4140 steel is widely used in various engine elements, such as connecting rods, crankshafts, axles, piston rods, and sprockets. The purpose of this study was to determine the hardness value and microstructure using temperature variations in the austempering process. The test results show that after the austempering process with temperature variations changed the hardness. The austempering process can increase the hardness value, but after the temperature is raised, the hardness value decreases. The greatest hardness value at 350°C was 264.4 BHN. After increasing the temperature to 400°C, the hardness decreased to 239.1 BHN. At a temperature of 450°C, the hardness was 226.7 BHN. Microstructure observations showed that the bainite is more uniform with increasing temperature. The test results show that the austempering temperature affects the hardness value and microstructure. When the austempering temperature is increased, the hardness value decreases.