Abstract
In the present study, various quenching media were added as cooling media for the quenching after pack carburizing treatment. The aim of this research is to get a suitable cooling medium for pack carburizing quenching treatment to increase the wear resistance of low carbon steel. Many cylindrical specimens for the adhesion wear tests were prepared from the used SS400 steel according to ASTM G99-04 specifications. Two heat treatment processes, namely pack carburizing and quenching were done. Firstly, the specimens are pack-carburized at a temperature of 875 °C, soaking time of 2 hours and quenched. The carburizing agent consists of Pinctada maxima shell powder (PMSP) and corn cob charcoal with a weight ratio of 30:70 %. Different cooling media (water, 10 % NaCl solution, 10 % cane molasses) in the pack carburizing quenching treatment are subjected to different kinds of tests. The hardness test was performed using Vickers micro hardness tester, the wear resistance was used in adhesive wear test, the carbon content was determined and microstructure examination was made using a scanning electron microscope (SEM-EDX). The result showed that all cooling media contributed to an increase in mechanical properties (surface hardness number, wear resistance), carbon content and microstructure change. The use of cooling media in the pack carburizing quenching process generally increases the surface hardness number of the specimen. The highest surface hardness number was 595 kg/mm2, respectively using 10 % cane molasses. The work shows that cane molasses can be used as a cooling medium for pack carburizing quenching of SS400 steel and contributed to the improvement of wear resistance
Highlights
The structural steel (SS400 steel) is a group of engineering low carbon steel materials used in automobile bodies, tin plates, panels, wire products, seamless tubes and agricultural tool products, etc. due to their specific properties such as high ductility, low surface hardness number, weldability and malleability
The aim of the study is to determine the effect of the pack carburizing quenching process with cane molasses medium on the wear resistance of SS400 low carbon steel
Determining the carbon content Based on the composition analysis with SEM-energy dispersive X-ray (EDX), there was an increase in carbon content in the specimens after the pack carburizing quenching treatment
Summary
The structural steel (SS400 steel) is a group of engineering low carbon steel materials used in automobile bodies, tin plates, panels, wire products, seamless tubes and agricultural tool products, etc. due to their specific properties such as high ductility, low surface hardness number, weldability and malleability. Wear resistance is classified into many types such as adhesive wear, which occurs when two surfaces move relative to one another, and these are relative movements in one direction or sequential movements under the influence of loads so that the stresses on the projections are large enough to create deformation and plastic adhesion. This adhesion will be at a high level of efficiency and capability in a clean environment and the area will increase during movement. There will be some relative wear on the superficial network at the weak point of the visible place [2]
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