Effect of heat treatment and cryogenics on hardness of ductile cast iron microstructure (FCD50)
Journal Title: Восточно-Европейский журнал передовых технологий - Year 2018, Vol 2, Issue 12
Abstract
<p>The results of researches of possibilities of increasing the mechanical properties of pig iron with ball-bearing graphite of brand FCD-50 by the combined heat treatment are described. The scheme of multistage heat treatment, the characteristic feature of which is the operation of cooling in liquid nitrogen, is proposed. The use of such a scheme allows for increased HRC hardness characteristics. The study of the microstructure of cast iron treated with this scheme has proved the efficiency of the cryogenic heat treatment stage and determined its rational regimes.</p><p>To match or approximate the properties of steel, the mechanical properties of this ductile cast iron 50 (FCD-50) must be enhanced by methods such as ACTDI (austemper cryogenic and temper Ductile Iron). In this procedure, the FCD-50 specimen is inserted into the electric kitchen heater at 350 °C (room temperature), heated to 600 °C and held at this temperature for 45 minutes. Next, the specimen is heated to 900 °C and held at this temperature for 1 hour (temperature austenisation). Then, the specimen is placed in furnace 2 at 3,000 °C for 45 minutes (austempering process). The specimen subsequently is cooled in liquid nitrogen. In this study, additional specimens were obtained for hardness and microstructure tests. The as-cast test yielded a hardness value of 18.39 HRC. In the hardness test for the ACTDI process, 12 hours of submersion yielded the highest hardness result of 24.25 HRC. In terms of the changes in microstructure after soaking changes, the amount of perlite present in the specimen was greater than that of ferrite, and the arrangement of graphite nodules was better than that of the as-cast material.</p>
Authors and Affiliations
Suriasnyah Sabarudin, Pratikto Pratikto, Agus Suprapto, Yudy Surya Irawan
Keywords
Related Articles
- EP ID EP527942
- DOI 10.15587/1729-4061.2018.129013
- Views 81
- Downloads 0
Development of the method for structural-parametric optimization in order to improve the efficiency of transition processes in periodic systems
<p>In order to get the most out of the enterprise’s operational processes, the operational processes of functional systems are optimized. However, in the process of optimization, controlled systems over a significant amo...
Modeling of the functioning of territorial systems with the purpose of identification of problem situations
<p>The purposeful territorial system (country, region), containing production, consumption, management, and environmental spheres is considered. In the process of system functioning, problem situations arise. The method...
Influence of the direct message search mechanism based on the TCP protocols on the exchange process
<p class="Default">The direct search mechanism is implemented with the expansion of the traditional socket TCP interface for receiving messages while bypassing the traditional order of the established queue. This mechani...
Development of a method of increasing the interference immunity of frequency-hopping spread spectrum radio communication devices
The development of a technique for increasing the interference immunity of frequency-hopping spread spectrum radio communication equipment has been carried out. The essence of the proposed method is the rational distribu...
Development of the system for vibration diagnosis of bearing assemblies using an analog interface
<p>We have proposed a system for early vibration diagnosis of gas-pumping units, specifically bearing assemblies with improved metrological characteristics. The technique makes it possible to solve the task of early diag...