Influence of Solution Treatment Temperature with Sub Zero Quenching Towards Hardness and Metallography of Ti6Al4V

Syaaf, Tantya Ani Giranita (2019) Influence of Solution Treatment Temperature with Sub Zero Quenching Towards Hardness and Metallography of Ti6Al4V. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Bone fractures are one of main problem in health cases. According to WHO, numbers of bone fractures been increasing since 2007. Healing the injury of fractures can be aid with the installation of the implant (orthopaedic implants). The selection of the implant materials such as stainless steel AISI 316L, cobalt-chromium and Ti6Al4V must be based on standard and biocompatibility characteristics. Ti6Al4V are preferable as compared to other metal since titanium has excellent corrosion resistance, high specific strength, and low modulus elasticity [1]. Ti-6Al-4V which contain alpha and beta phase is one of the most popular titanium alloys other, where the alpha phase, stabilized by 6% aluminum, has good weld ability, and corrosion resistance, while beta phase stabilized by the 4% of vanadium and has good ductility. The influence of solution treatment and sub-zero quenched followed with aging will investigated with two methods, hardness measurement and metallography. The results of before aging samples were compared to samples after aging to know the differences between those two processes. These samples were treated at four different temperatures, below (850℃), near (930,960℃), and above beta transus (1000 ℃) for one hour, followed with sub-zero quenching inside of a mixture of dry ice and alcohol. After quenching, samples then aged at 500℃ for four hours. Microstructure of Ti6Al4V before STA has a lamellar α+β phase. Due to subzero quenching after ST the hardness is increasing as compared to non heat treatment specimen with the tendency of higher ST temperature resulted in higher hardness. The highest hardness is achieved during ST 1000℃ temperature with 466 HV as compared to non heat treatment of 356.4 HV due to α’ martensite formation. The hardness increase further after aging providing 567.4 HV for ST at 1000℃ with subzero quench due to precipitation of α’ martensite to secondary alpha and beta.
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Patah tulang merupakan salah satu kendala bersar di dunia kesehatan. Berdasarkan WHO, angka korban patah tulang terus meningkat sejak 2007. Untuk menyembuhka patah tulang, diperlukan pemasangan implan pada tulang, dan material yang biasa digunakan sebagai implant tulang, adalah metal, polymer, keramik, dan komposit. Penggunaan metal sebagai impant ortopedik mengharuskan material tersertifikasi sesuai dengan karakter dari biomekanik dan biochemicalnya, sekaligus biological. Beberapa material yang biasa digunakan sebagai material implant, adalah Co-Cr, SS316L, dan titanium alloy. Titanium alloy merupakan material pilhan untuk implant medis, dikarenakan titanium meimiliki sifat ketahanan korosi yang baik, nilai spesifik strength yang tinggi, dan modulus elastisitas yang tinggi [1]. TI6Al4V merupakan alloy yang cukup popular diantara titanium alloys lainnya; Ti6Al4V mengandung alpha dan beta dalam kandungannya. Ti6Al4V mengandung alpha dan beta fasa, dimana alpha cenderung distabilkan 6 alumunium dan memiliki ketahanan korosi yang baik, sedangkan beta phase menstabilkan 4% vanadium dan memiliki sifat ulet yang baik. Pada penelitian ini, specimen akan di solution treatment pada temperature 850℃,930℃, 960℃, dan 1000℃ selama satu jam, lalu di quenched dengan sub zero quenching. Proses aging berlangsung selama 4 jam pada temperature 500℃. Hasil microstructure yang didapat sebelum STA memiliki struktur lamellar α+β phase. Dikarenakan sub zero setelah solution treatment meningkatkan kekerasan jika dibanding dengan sample tanpa treatment dengan tendensi kekerasan naik seiring dengan naiknya temperature solution treatment. Nilai kekerasan tertinggi didapat pada temperature solution treatment 1000℃ dengan 466 HV sedagkan sample tanpa treatment hanya 356.4 HV, hal ini dikarenakan adanya pembentukan alpha martensite dalam struktur. Kekerasan meningkat lebih jauh setelah aging, untuk material pemanasan 1000℃ memiliki nilai kekerasan 567.4 HV, hal ini dikarenakan adanya presipitasi secondary alpha

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Ti6Al4V, Sub Zero Quenching, solution treatment
Subjects:	T Technology > TJ Mechanical engineering and machinery T Technology > TN Mining engineering. Metallurgy > TN752.I5 Steel--Heat treatment
Divisions:	Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	Tantya Ani Giranita
Date Deposited:	21 Jul 2026 06:57
Last Modified:	21 Jul 2026 06:57
URI:	http://repository.its.ac.id/id/eprint/67505

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