Analysis of Quenching Parameters in AISI 4340 Steel by Using Design of Experiments

Abstract

This paper aims to investigate the effects of quenching parameters (temperature and time of austenitizing and cooling rate) on the microstructure, hardness and distortion of AISI 4340 steel by Design of Experiments (DoE). The factorial design was used to determine the influence of the factors on the response variable. After quench samples were characterized by optical and scanning electron microscopy, hardness test and dimensional analysis. Navy C-rings samples are used to determine the distortions after quenching due to development of residual stresses caused by non-uniform cooling. Results show that the cooling rate has a significant effect on the steel after quenching, however, the suitability of all factors is important to achieve the desired properties.

The Effect of Quenching on High-temperature Heat Treated Mild Steel and its Corrosion Resistanc

“…The type of corrosion commonly observed on all of these micrographs is the pitting form because the metal is pitted by aerated sodium chloride solution (Seidu & Kutelu, 2013). The different areas on the surface of the mild steel become unstable when a pit is created on the metal surface, and the mild steel samples start to oxidize, and where the pit is created, the corrosion will continue to propagate, and the pits continue to grow (Marlon et al, 2018). The corrosion rate is the rate at which materials deteriorate when in contact with the environment for a known duration of time.…”

Effect of LN2 and CO2 Coolants in hard turning of AISI 4340 steel using tungsten carbide tool

“…Then tempering was done after quenching at a temperature of 320 °C for 1 h to relieve stress and to reduce brittleness of the material. So, the hardness of the work material was enhanced to 48 HRC [31,32]. The uncoated tungsten carbide inserts with the specification of CNMG 120408 ML K10 were utilised as the cutting tool.…”