-, Yurianto (2019) Ekivalensi Karakteristik Sambungan Las Pada Q&T Plate Steel Base Metals. Doctor thesis, Universitas Brawijaya.
Abstract
Heat treatable Steel merupakan baja dengan kandungan unsur carbon lebih dari 2%, artinya baja bisa diperlakukan panas quench dan temper untuk mendapatkan kekerasan, ketangguhan dan keliatan yang sesuai. Setelah mengalami proses quench dan temper menghasilkan Quench and Tempered Steel, baja ini sering digunakan sebagai komponen yang menuntut kekuatan dan kekerasan tinggi. Hasil pengelasan pada Quenched and Tempered Plate Steel adalah sambungan las dimana terdapat pelunakan pada heat affected zone. Pelunakan terjadi karena penggunaan masuk yang terlalu tinggi. Identifikasi masalah dari penelitian ini adalah: a) Kekerasan, impact energy dan keausan (wear) dari Quenched and Tempered Steel yang tidak stabil karena penggunaan parameter tidak optimum. b). Sifat mampu las Quenched and Tempered Steel yang buruk menurunkan kekuatan las. c) Melunaknya daerah terpengaruh panas pada sambungan las. Dari uraian diatas, pada penelitian ini diambil rumusan masalah sebagai berikut: “Bagaimana meningkatkan kekerasan produk Quenched and Tempered Plate Steel dan meningkatkan kekerasan sambungan las antara Quenched and Tempered Plate Steel dan Quenched and Tempered Plate Steel”. Tujuan penelitian adalah melakukan ekivalensi karakteristik sambungan las Quenched and Tempered Plate Steel Base Metals dan meningkatkan kekerasan heat affected zone sambungan las antara dua buah Quenched and Tempered Plate Steel. Untuk mencapai tujuan penelitian ini dilakukan tahapan sebagai berikut: a) Mengklasifikasi dan mengkarakterisasi bahan yang digunakan (plat baja yang dilas). b) Melakukan optimasi parameter perlakuan panas quench dan temper terhadap kekerasan dan impact energy. c) Melakukan optimasi parameter perlakuan panas quench dan temper terhadap kekerasan dan keausan. d) Melakukan optimasi parameter perlakuan panas quench dan temper terhadap impact energy dan keausan. e). Melakukan analisis hasil pengelasan antar Quenched and Tempered Plate Steel. f) Melakukan analisis hasil tembakan Quenched and Tempered Plate Steel pada jarak 25 m, 20 m, 15 m dan 10 m menggunakan sejata SP kaliber 5,56-TJ buatan PT. Pindad (Persero). Bahan yang digunakan adalah hot rolled plate steel dengan kandungan carbon ± 0,29342% berat dan KSA 500 Plate Steel buatan PT. Krakatau Steel (Persero), Cilegon, Banten, Indonesia. Metode yang digunakan meliputi: a) uji laboratoris meliputi metallografi, uji kekerasan dan uji impact. b) optimasi parameter quench dan temper pada kekerasan, impact energy dan keausan dengan metode optimasi Taguchi. Manfaat penelitian bisa memberikan kontribusi konsep dan metode dalam menghasilkan baja dengan kekerasan, ketahanan aus dan impact energy optimum pada heat-treatable Steel (buatan dalam negeri). Selain itu hasil penelitian dapat dikembangkan kepenelitian lanjut dalam upaya mendapatkan Quenched and Tempered Plate Steel lokal yang mampu bersaing dipasar internasional. Hasil yang diperoleh dari penelitian ini adalah bahwa parameter quench dan temper yang mempengaruhi kekerasan, impact energy absorbed dan keausan. b) metode pengelasan terhadap Quenched and Tempered Steel yang menghasilkan sambugan las dengan peningkata kekerasan. c) Quenched and Tempered Steel Welded Joint tidak tembus oleh peluru kaliber 5,56-TJ pada jarak 10 m.
English Abstract
Heat treatable steel is steel with a carbon content of more than 2%, meaning that the steel can be treated with heat quench and temper to get the appropriate hardness, toughness, and plasticity. After experiencing the process of quenching and tempering producing Quench and Tempered Steel, these steels often used for a component that demands high strength and hardness. Welding results in Quenched and Tempered Plate Steel are welded joints where there is softening in the heat-affected zone. Softening occurs because the use of entry is too high. Identification of the problems of this study are a) The unstable hardness, impact energy, and wear of Quenched and Tempered Steel because the use of parameters is not optimum. b). Poor weldability of Quenched and Tempered Steel decreases weld strength. c) Softening of heat-affected areas at the welded joint. From the description above, in this study, the following problem formulation was taken: "How to increase the hardness of Quenched and Tempered Plate Steel products and increase the weld joint hardness between Quenched and Tempered Plate Steel and Quenched and Tempered Plate Steel." The purpose of this study is to make the equivalence of the Quenched and Tempered Plate Steel Base Metals weld joints and increase the heat-affected zone of the weld joint between two Quenched and Tempered Plate Steel welds. The study aims to obtain the characteristic equivalence of welded joint on on quenched and tempered tteel base metals. To achieve the aim of this research, the following stages: a) Classifying and characterizing the material used (welded steel plate). b) Optimizing the parameters of quench and temper heat treatment for hardness and impact energy. c) Optimizing the parameters of quench and temper heat treatment for hardness and wear. d) Optimizing the parameters of quench and temper heat treatment on impact energy and wear. e). Analyzing welding results between Quenched and Tempered Plate Steel. f) Analyzing the results of Quenched and Tempered Plate Steel shots at a distance of 25 m, 20 m, 15 m, and 10 m using a 5.56-TJ caliber SP gun made by PT. Pindad (Persero). The material used is hot rolled plate steel with a carbon content of ± 0.29342% by weight and KSA 500 Plate Steel made by PT. Krakatau Steel (Persero), Cilegon, Banten, Indonesia. The methods used include a) laboratory testing, including metallography, hardness test, and impact test. b) optimization of the quench and temper parameters on hardness, impact energy, and wear by the Taguchi optimization method. The benefits of research can contribute concepts and methods in producing steel with optimum hardness, wear-resistance, and impact energy on heat-treated steel (domestically made). Also, research results can be developed with further research to get a local Quenched and Tempered Plate Steel that can compete in the international market. The results obtained from this study are that the parameters of quench and temper affect hardness, impact energy absorbed, and wear. b) welding methods for Quenched and Tempered Steel, which produce welded joints with hardness enhancements. c) Quenched and Tempered Steel Welded Joints not penetrated by 5.56-TJ caliber bullets at a distance of 10 m
Other obstract
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| Item Type: | Thesis (Doctor) |
|---|---|
| Identification Number: | DIS/671.52/YUR/e/2019/061910491 |
| Uncontrolled Keywords: | austenitiation, ductility, hardening, martensite, tempering,-austenitisasi, keliatan, pengerasan, martensite, penemperan. |
| Subjects: | 600 Technology (Applied sciences) > 671 Metalworking Processes and primary metal products > 671.5 Joining and cutting of metals > 671.52 Welding |
| Divisions: | S2/S3 > Doktor Teknik Mesin, Fakultas Teknik |
| Depositing User: | Endang Susworini |
| Date Deposited: | 27 Jan 2022 01:52 |
| Last Modified: | 27 Jan 2022 01:52 |
| URI: | http://repository.ub.ac.id/id/eprint/188910 |
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