EFFECT OF AGITATION SPEED 10% BRINE QUENCHING MEDIA IN QUENCH HARDENING ON MICRO STRUCTURE AND HARDNESS AT BUCKET TEETH MATERIAL ESCO V61VX

• Main Author: SATRIA PUTRA (NIM : 12506021), RANDY
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/23836
• Institution: Institut Teknologi Bandung

In The Operating heavy equipment, bucket teeth is one of the important role. This component will interact directly with the material to be taken in the field. A series of studies have been done to increase the hardness so that the bucket teeth more resistant to abrasion. This research was conducted to study the influence of heat treatment and quenching media agitation at quench hardening against quench depth and the stability of the microstructure of materials bucket teeth Esco V61VX. Heat treatment is carried out quench hardening with 10% brine solution media agitated with three different speed 550 rpm, 625 rpm, and 710 rpm. Holding was then performed at room temperature for 100 hours. Provision of agitation on the quenching media was carried out to see the quench depth of the material bucket teeth Esco V61VX, while the holding conducted to compare the stability of the microstructure of as quench material and material after quenching with holding. The results of this study showed that the addition of agitation in the process of quench hardening increase the amount of martensite and decreasing retained austenite phase amount of 40.5% in the treatment without agitation to be 28.52% or about 30% in the quenching process with the highest agitation speed of 710 rpm. Similarly, the increase of martensite phase increased to 20% at the highest agitation speed. Hardness value increases with increasing agitation speed, the highest increase in hardness occurred when in the process of quench hardening added agitation speed of 710 rpm. In the process of quench hardening without added agitation hardness will decrease to 18% when it reaches a distance of 5mm from the surface, where as if in the process of quench hardening added up to 710 rpm agitation hardness value will only decrease by 4% at a distance of 5mm from the surface. Holding at room temperature for 100 hours to prove that the material was still apparent phase transformation of retained austenite into martensite. This change is seen from the percentage of retained austenite phase as quench which declined to 30% after the holding at room temperature for 100 hours. Decrease the percentage of the lowest residual austenite phase is 2%, occurred in quenching with the highest agitation speed.