Casanovia, Zidan Fathir (2026) Implementasi Blocking System Dengan Metode Quenching Liquid Nitrogen Pada Pengelasan Dissimilar Welding Menggunakan Material SS304 Dengan A335 P11. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Penggunaan sambungan dissimilar antara stainless steel austenitik SS304 dan SS304L dengan baja paduan kromium–molibdenum ASTM A335 P11 banyak diterapkan pada sistem perpipaan industri temperatur tinggi untuk mengombinasikan ketahanan korosi tinggi dengan kekuatan serta ketahanan creep yang baik. Namun, perbedaan koefisien muai termal, konduktivitas panas, serta komposisi kimia kedua material tersebut menyebabkan distribusi tegangan sisa yang kompleks, gradien kekerasan yang tajam, serta potensi pembentukan martensit keras pada sisi P11 dan sensitisasi akibat presipitasi karbida pada sisi stainless steel di daerah heat affected zone (HAZ). Metode konvensional seperti Post Weld Heat Treatment (PWHT) memiliki keterbatasan dalam pengendalian mikrostruktur sambungan dissimilar, sedangkan quenching air berpotensi menimbulkan thermal shock, distorsi, dan peningkatan risiko retak. Penelitian ini bertujuan menganalisis dan membandingkan pengaruh quenching air dengan quenching liquid nitrogen (LN₂) yang dikombinasikan dengan blocking system terhadap karakteristik mikrostruktur dan sifat mekanik sambungan dissimilar SS304 dan SS304L dengan ASTM A335 P11 yang dibuat menggunakan proses Gas Tungsten Arc Welding (GTAW). Blocking system diterapkan sebagai strategi pengendalian distribusi panas untuk membatasi pendinginan ekstrem pada sisi baja paduan sekaligus mengoptimalkan pendinginan pada sisi stainless steel. Karakterisasi dilakukan melalui pengamatan mikrostruktur pada logam las dan HAZ, pengujian kekerasan, uji korosi, uji tarik, serta evaluasi distorsi makro. Hasil penelitian diharapkan menunjukkan bahwa kombinasi quenching liquid nitrogen dan blocking system mampu mengendalikan transformasi martensit pada P11, meminimalkan potensi sensitisasi pada SS304 dan SS304L, serta menghasilkan distribusi sifat mekanik yang lebih seimbang dibandingkan quenching air, sehingga meningkatkan keandalan sambungan untuk aplikasi industri temperatur tinggi.
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Dissimilar joints between austenitic stainless steel SS304 and SS304L with chromium–molybdenum alloy steel ASTM A335 P11 are widely applied in high-temperature industrial piping systems to combine high corrosion resistance with strength and creep resistance. However, differences in thermal expansion coefficient, thermal conductivity, and chemical composition between the two materials result in complex residual stress distribution, sharp hardness gradients, and the potential formation of hard martensite on the P11 side as well as sensitization due to carbide precipitation on the stainless steel side within the heat affected zone (HAZ). Conventional methods such as Post Weld Heat Treatment (PWHT) present limitations in controlling the microstructure of dissimilar joints, while water quenching may induce thermal shock, distortion, and an increased risk of cracking. This study aims to analyze and compare the effects of water quenching and liquid nitrogen (LN₂) quenching combined with a blocking system on the microstructural characteristics and mechanical properties of dissimilar SS304 and SS304L with ASTM A335 P11 joints produced using the Gas Tungsten Arc Welding (GTAW) process. The blocking system is implemented as a thermal control strategy to limit excessive cooling on the alloy steel side while optimizing cooling on the stainless steel side. Characterization is conducted through microstructural observation of the weld metal and HAZ, hardness testing, corrosion testing, tensile testing, and macro-distortion evaluation. The results are expected to demonstrate that the combination of LN₂ quenching and a blocking system can control martensitic transformation in P11, minimize sensitization in SS304 and SS304L, and produce a more balanced mechanical property distribution compared to water quenching, thereby improving joint reliability for high-temperature industrial applications.
Keyword : Dissimilar welding, SS304 and SS304L, ASTM A335 P11, liquid nitrogen quenching, blocking system, Post Weld Heat Treatment.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Dissimilar welding, SS304 dan SS304L, ASTM A335 P11, liquid nitrogen quenching, blocking system, Post Weld Heat Treatment. Dissimilar welding, SS304 and SS304L, ASTM A335 P11, liquid nitrogen quenching, blocking system, Post Weld Heat Treatment. |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA418.16 Materials--Testing. T Technology > TA Engineering (General). Civil engineering (General) > TA418.42 Hardness properties and tests. Hardness--Testing. T Technology > TS Manufactures > TS205 Metals--Heat treatment. T Technology > TS Manufactures > TS227 Welding. T Technology > TS Manufactures > TS320 Steel--Metallurgy. |
| Divisions: | Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis |
| Depositing User: | Zidan Fathir Casanovia |
| Date Deposited: | 22 Jul 2026 03:53 |
| Last Modified: | 22 Jul 2026 03:53 |
| URI: | http://repository.its.ac.id/id/eprint/136125 |
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