CHARACTERISTIC MICROSTRUCTURE OF MICRO HOT ROLLED PLATE STEEL VARIATING THE RADIUS OF BENDING TREATMENT WITH QUENCHING AND TEMPERING HEAT TREATMENT
HRP Steel is heat treatable material that is manufactured by Krakatu Company Steel Indonesian, which the specification of HRP steel is classified as an armor 2nd class.To get the hardness and high strength, it is quenched (by heating it up to austenite temperature and held for a few moments, then cooled with water at T°C).Then the HRP Steel is heat treated again tempering (by heating it up to a certain temperature below the eutectoid line and retained for a while, then cooled with atmospheric air media) to improve its ductility. The purpose of this heat treatment is to improve the micro-structure that can affect the value of hardness. There are two additional (?) methods used in this research for treatment of that material: mechanical bending treatment with radius 55 mm and 60 mm. Analysis of the results of research shows that bending treatment and heat treatment modifies the morphology of micro-structure. In the 55 mm bending radius treatment and quenching-tempering treatment, a micro-structure formed of martensite structure that has higher percentage and has the form of a smooth martensite structure so that the value of Vickers hardness number is higher than the other treatment of 453 VHN treatment.
The author would like to thank for their ﬁnancial support of this work:
Directorate of Research and Community Service. Directorate General of Research and Development Reinforcement, Ministry of Research, Technology and Higher Ed-ucation, in accordance with Research Contract No. SP DIPA: 042.06.1.401516/2017, Date 07 December 2016. And Prof.Dr.Ir. Pratikto, MMT as Principal Counselor, Prof. Ir.Agus Suprapto, Meng., PhD , Co Promotor1 and Dr.Ir. Achmad As'ad Sonief, MT Co. Promotor2.
Results Discussions / Suggestions by: Prof.Ir. Rochim Suratman, MEng., PhD (Technical Head of PT PINDAD) Ir. Amung Sumantri, MM (Product Development Maneger of PT Krakatau Steel)
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