Effect of Time on the Compound Layer Formed During Salt Bath Nitriding of Aisi 4140 Steel

Abstract

<p class="AMSmaintext">This research was carried out to study the effect of time on the compound layer of AISI 4140 steel in salt bath nitriding. The nitriding process were implemented on AISI 4140 steel in salt bath component for different times (from 1 h to 10 h) at 580 °C. Samples of AISI 4140 steel were treated and characterized (at surface and core of samples) through the following technique: optical microscopy, scanning electron microscopy, X-ray diffraction (XRD) and microhardness tester. Shows that thick compound layers are formed during continuous salt bath nitriding. The thickness of the compound layer and surface hardness increases with increasing time.</p>

The influence of plasma nitriding process conditions on the microstructure of coatings obtained on the substrate of selected tool steels

“…They are implemented by combining thermal treatments with a targeted change in the chemical composition of the surface layer (Skrzypek & Przybyłowicz, 2020). At a specific temperature and time, the near-surface zone is diffusely saturated with an element or elements in solid (Ucar et al, 2020;Xie et al, 2012), liquid (Ghelloudj et al, 2018;Kul et al, 2020;Sen et al, 2005), gaseous (Barnaby et al, 1975;Liu et al, 2020;Torchane, 2021) and plasma (Drajewicz et al, 2021) media. One such process is plasma nitriding, which aims to improve the anticorrosive properties (Kusmič & Hrubý, 2015;Kusmič et al, 2021), fatigue resistance (Kovacı et al, 2016a) and abrasive wear (Karaoğlu, 2002;Kovacı et al, 2019) of steels, titanium alloys and iron matrix sinters (Çelik et al, 2000;Rakowski et al, 2006).…”

Microstructure, Mechanical and Tribological Behaviour of Aisi 316l Stainless Steel During Salt Bath Nitriding

“…According to [33], nitriding is a thermochemical process through which nitrogen atoms are diffused and dispersed at the surface level of the materials at a proper temperature, which leads to an increase in the surface hardness and as a result increases the performance and the life span of the industrial parts. There are different methods of nitriding operations such as salt bath nitriding (SBN) [34][35][36], gas nitriding (GN) [37,38], and plasma nitriding (PN) [39,40]. A literature survey can easily find several hundred papers published over the last few years on the topic of nitriding of austenitic stainless steel [41][42][43].…”