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Journal : Makara Journal of Technology

Effects Of 0.25 % Mo (Molybdenum) Which Is Contained In The Ductile Cast Iron On Mechanical Properties Of Austempered Ductile Iron (ADI). Nukman, Nukman; Arifin, Bustanul; Sugiarto, Bambang
Makara Journal of Technology Vol. 6, No. 1
Publisher : UI Scholars Hub

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Abstract

The aim of this research is to investigate the effects of 0.25 % Mo (Molybdenum) which is contained in the ductile cast iron on mechanical properties of Austempered Ductile Iron (ADI). The various temperatures and the holding times are used in the heat treatment processes. Using a given 0.25 % Mo in the ductile iron, ADI's alloyed developes a higher ultimate tensile stress value and decreases the elongation if we compare with the as cast (non alloy ductile iron). The higher impact energy value obtained at 9000 C austenization and 375o C austempering temperatures during 60 minutes holding times. The structure changes into ausferrit.
Effect of Contact Time on Interface Reaction between Aluminum Silicon (7% and 11%) Alloy and Steel Dies SKD 61 Suharno, Bambang; Nurhayati, Neni Octapiani; Arifin, Bustanul; Harjanto, Sri
Makara Journal of Technology Vol. 11, No. 2
Publisher : UI Scholars Hub

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Abstract

Effect of Contact Time on Interface Reaction between Aluminum Silicon (7% and 11%) Alloy and Steel Dies SKD 61. Die soldering (die sticking) is a defect of metal casting in which molten metal “welds” to the metallic die mold surface during casting process. Die soldering is the result of an interface reaction between the molten aluminum and the die material. Aluminum alloy with 7 and 11% silicon and SKD 61 die steel are the most common melt and die material used in aluminum die casting. This research is done to study the morphology and the characteristics of the formed AlxFeySiz intermetallic layer during interface reaction at dipping test. The samples of as-anneal SKD 61 tool steel was dipped into the molten of Al-7%Si held at temperature 680oC and into molten Al-11%Si held at temperature 710oC with the different contact time of 10 minutes; 30 minutes; and 50 minutes. The research results showed that the interface reaction can form a compact intermetallic layer with AlxFey phase and a broken intermetallic layer with AlxFeySiz phase on the surface of SKD 61 tool steel. The increasing of the contact time by the immersion of material SKD 61 tool steel in both of molten Al-7%Si and Al-11%Si will increase the thickness of the AlxFeySiz intermetallic layer until an optimum point and then decreasing. The micro hardness of the AlxFeySiz intermetallic layer depends on the content of the iron. Increasing of the iron content in intermetallic layer will increase the micro hardness of the AlxFeySiz. This condition happened because the increasing of Fe content will cause forming of intermetallic AlxFeySiz phase becomes quicker.
Co-Authors - Afrizal A. Prasetiyo, Nugraha A.A. Ketut Agung Cahyawan W Abd. Haris Abdul Muid Abdul Rachman Syam Tuasikal Abili, Muhammad Addin, Faathir Sukron Adia Nugraha Adlis Santoni Admin Alif Agus Adhi Nugroho Agustin, Esther Sri Astuti Soeryaningrum Ahmad Fuady Aisya, Nurul Aji Andar Subekti Akhmad Fauzi Ali Imron Alkaff, Firas F. Alkaff, Sylmina D. Amanda Putra Seta Ambya, Ambya Amin, Irnawati H. Amzul Rifin Aneftasari, Ica Rizki Ani Suryani Ani Suryani Anshar Saud Anugrah, Dian Febriany Ardiansyah, Akhmad Arief Daryanto Aristiyani, Ririn Ashari, Dias Astuti, Ayun Dwi Aulia, Muhammad Rifky Azwan, Ahmad Baba Barus Bahar, Muhammad A. Baihaqi, Moh. Hamdan Bambang Siswaji Bambang Sugiarto Bambang Suharno Budiyuwono, Slamet Cahyawati, Novia Chairunnisa, Nabila Putri Yusni Daniyah, Daniyah Deswati Deswati Dhestriani Mulyahati Adam, Thaesha Didik Supriyanto, Didik Dominicus Savio Priyarsono Dwicahya, Bambang Dyah Aryani Perwitasari Eka Kasymir Eka Nuryanto Budi Susila Elly Wahyudin Endryanto, Teguh Etty Susilowati Faizun, Adi Fatayati, Sun Fatimah Azzahra Fitriani Fitriani Frisky, Sintia Gemini Alam Giffary, Mohammad Afdhal Habsyi, Irsan Hakim, Faisol Hamzar Suyani Hanny Hafiar Hapsari, Jenny Putri Harianto Harianto Hariyanto, Andi Hasan, Nurhasan Hasdin Hanis Hasnirwan Hasnirwan Hendrawan Hendrawan Hermansyah Aziz Hermanto Siregar Hernanda, Tiara Aprilia Putri Hidayat, Cesar Agung Hidayat, Tauhid Imam Much Ibnu Subroto Iman Setiawan Imelda - Imron Fauzi Irsan Habsyi Irwan Irwan Istikomah Istikomah Jati, Budi Pramono Joni, Rahma Kada, Ryohei Kamiko, Awfa Joti Aghna Karim, Amrulloh Khalik, Subehan Kholidi, Ahmad Khaerul Kurniawan, Muh D. Lestari, Dyah Aring Hepiana Lidya Sari Mas Indah, Lidya Sari Mas Lukman Santoso M. Husein Sawit M. Iqbal Alfarisyi M. Rifqi Rokhman Madolangan, Jamaluddin Maghfirah, Sucy Mahardika, Desi Aditia Mai Efdi Massi, Muhammad N. Meutia, Meutia Muh. Deni Kurniawan Muhamad Hamdani, Muhamad Muhammad Akram Muhammad Haqa, Rizki Nur Muhammad Khosyi'in Muhammad Said Didu Munaf Ismail, Munaf Munawwaroh, Makiyatul Niamuzisilawati, Eva Nisa, Himmatun Novi Rosanti Novia, Asih Noviana, Tia Nugroho, Agus Adi Nunung Nuryartono Nurhayati, Neni Octapiani Nursaid Rizalullael, Muh. Nuryanto Budisusila, Eka Offermans, Astrid Olly Norita Tetra Padmawati, Retna S. Pamuncak, Ririn Perwitasari, Dyah A. Postma, Maarten J. Purba, Fredrick D. Puyu, Darsul S. Qosim, Achmad R Hanung Ismono R. Rokhman, Muhammad Rachman, Muhammad Ibrahim Ragil Qiansantang, Lalu Raisika, . Rasuane Noor Rauf, Saidah Reed, Michael Rifai, Muhamad Rina Oktaviani Rinaldo, Rio Rita Rosiana Sabaruddinsah Sabaruddinsah, Sabaruddinsah Salamah, Sovia Salasa, Danie Sanusi Ibrahim Sanusi, Mayamariska Sarifah, Latifah M. Sarwadan, Muhamad G. Sattu, Fidel Yoel Junovray Siahaan, Henry MP Siti Aisyah Sri Arttini Dwi Prasetyawati Sri Harjanto Sugiyono . Suhardin Suhardin, Suhardin Sukendar, Irwan Suparmin, . Suryati Susetiyo, Ari Suswono Suswono Syamsiar, Syamsiar Tanaka, Katsuya Taqi, Muhamad Toni Bakhtiar Tubagus Ismail Utami, Ikrimah N. Veni Hadju Virgiana, Sita Wahyu Agung Sakti, Lalu Wahyuni, Hanif Wan Abbas Zakaria Widyastutik Wisena, Bambang Aria Wulandari, Anis Erma Yaktiworo Indriani Yandra Arkeman Yudiana, Pina Yugiantoro, Darojat Yuliet Yuliet Yunita Salamah Zainal Abidin Zulkarnain Zulkarnain