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Miftakhur Rohmah, Miftakhur
Agricultural Product Technology Department, Agricultural Faculty, Mulawarman University, Samarinda
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Journal : Metalurgi

 1 
EFFECT OF COOLING-MEDIUM INDUCED INITIAL STRUCTURE BEFORE INTERCRITICAL ANNEALING ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF LOW ALLOY DUAL-PHASE STEEL Romijarso, Toni Bambang; Rohmah, Miftakhur; Ariati, Myrna; Mabruri, Efendi; Siradj, Eddy Sumarno
Metalurgi Vol 38, No 2 (2023): Metalurgi Vol. 38 No. 2 2023
Publisher : National Research and Innovation Agency (BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/metalurgi.2023.727

Abstract

The present research focused on determining the effect of cooling-medium-induced initial structure before the intercritical annealing induced dual-phase structure in the low alloy steel. Low carbon steel, which consists of containing 0.09 wt.% C was heated at 920 °C for 30 minutes to austenitization and then cooled in various media to provide the different initial structures before the IA (intercritical annealing) process. After austenization, the cooling process in the furnace and open-air provided a ferrite-pearlite phase, while the cooling process in water generated full martensite as the initial structure. Afterwards, the sample was intercritical-annealed at 750 °C (temperature between Ac1 and Ac3 lines or intercritical zone) for 10 minutes and then quenched in water. The water quenching after the austenitizing process improved the mechanical strength of steel (919 MPa), compared to the as-received state (519 MPa) due to martensite formation. As the cooling rate increased after the austenitizing process, the tensile strength increased and the elongation decreased. The different structures before intercritical annealing affected the martensite volume fraction and further correlated with improving mechanical properties. The ferrite and pearlite, as the initial structure before the IA process, provide a smaller fraction of martensite (18.36 vol.% for furnace cooling and 27.85 vol.% for open-air cooling). In contrast, the full martensite as the initial structure before IA generates a higher fraction of martensite (39.25 vol.%). The tensile strengths obtained were 512, 516, and 541 MPa with elongations of 29.8%, 30.1% and 32.6% for cooling furnace, open air and water, respectively. The strain-hardening behavior during the intercritical annealing is not affected by the initial process of the structure.
Co-Authors AA Sudharmawan, AA Abror, Darul Afifah, Siti Agustu Sholeh Pujokaroni Amaliah, Khusnatul Andini, Nesi Anti Angin, Regina Grasia Perangin Anton Rahmadi Anton Rahmadi Anton Rahmadi Anton Rahmadi Anton Rahmadi Anton Rahmadi Anton Rahmadi Anton Rahmadi Anton Rahmadi Apriadi, Rimbawan Apriyadi, Rimbawan Arzeti, Varistra Ripana Aswita Emmawati Ayu Pratama Putri, Diah Azizah, Btari Nur Azmiyati, Afifah Banin, Maghfirotin Marta Basuki, stevani Bernatal Saragih Bernatal Saragih Bernatal Saragih Candra Wahyuni Candrawargani, Devy Tri Carolina, Debi Chiril, Augustin Mustika Chusnul Hidayat dedi irawan Dewi, Aninda Adistyana Diana Ermawati Dilly Dessy Fauzyah Dwi Noor Tang Dwinanda R, Elvira Dyah Ari Susanti Eddy S Siradj Ella, Ella Widya RIzki Emmawati, Aswita F. Shoufika Hilyana Faitullah, Faitullah Fatria, Mega Fauziyah, Eni Febriyanti, Venta Fernandez, Dahlia Frameilia, Dila Fridya Oktavianti Soliviana Gustiana, Eka Hadi Suprapto Hali, Ali Usman Hamka Hidayah, Khikmatul Hidayat, Khansa Fitria Latifa Hudawati, Nurul Husnul Khotimah Rustam Ibnu Rusydi Iddris Salam Indah Tri Jumiarti Isak Budi Setionugroho Islamiati, Eny Johny Wahyuadi Soedarsono Junita, Nadia Kartika Sari Kartika Sari Kartika Sari Khafid Ismail Khansa Fitria Latifa Hidayat Khusna, Cicin Amalia Kiki Puspitasari Krishna Purnawan Candra Kristina, Vienti Elisa Kumalasari, Eri Puji Lalasari, Latifa Hanum Lia Agustin Liana Sari, Nuri Mabruri, Efendi Maghfirotin Marta Banin Maghfirotin Marta Banin Mansur Mansur Mansur, Ali Marwati Marwati Masithoh, Fitria Nur Masitoh, Gustina Maulida Rachmawati Maulida Rachmawati Melati Kusuma Wardani Mohamad Arifin Muhammad Anas Ma'arif Muinah Fadhilah, Muinah Mujidin, Mujidin Munawar, M. Soleh Al Mursilah Mustofa, M Iqbal Myrna Ariati, Myrna Natalie, Regina Safira Natasha, Nadia Chrisayu Nawangsari, Elliza Natania Ningsih, Dewi Andariya Ningsih, Nur Tia Ningtias, Dyah Ayu Nisa, Haerun Nisa, Yahdiatun Nita Dwi Astikasari Noor, M. Fauzan Nur Amaliah Nur Masitoh, Fitria Nur Rokhman Nurgiyantoro, Edi Nurrohmah, Meizza Nuryati, Ida Nuzula, Wenny Firdausin Oktania, Wulan Panggulu Ahmad Ramadhani Utoro Pardi, Lasmono Permata, Aurel Priastyca Pinto, Juliana Gomes Prabowo , Sulistyo Prabowo, Sulistyo Priyono, Sigit Pujokaroni, Agustu Sholeh Putri, Annisa Ananda Putri, Ariesta Brinawaty Putri, Ella Wiyasa Qayyum, Abdul Rafii Nur Fauzan, Muhammad Rafii Rafika Rahmadani Rahmawati, Rahmawati Ratri Retno Utami Ravita D, Nena Reni Yuli Astutik Respati, Laras Laxita Winda Retnaningtyas, Erma Retno Palupi Yonni Siwi Ria Anggraeni Rifa'i, Muhamad Nanang Rina Juwita Riza Tsalatsatul Mufida Rohmani, Diah Tika Romijarso, Toni B. Romijarso, Toni Bambang Ronny Martien Ryzkyana, Cyntia Finda Safira Fadhila Safira, Liana Sagena, Uni W Sapay, Meni Mita Sejati, Putri Eka Selviana Ave Maria Funan Shanty Natalia Sholichah, Nazilatul Maulinda Sholikah, Diah Imroatus Sinaga, Umi Teresia Siti Hardianti, Siti Solly Aryza Sri Raharjo Suharni Milenia Wati Suheni Suheni Sukmiyati Agustin Sumadi, Lalu Aditya Supitri, Eka Sutati, Sutati Syamsul Hadi Tahni'ah, Anti Tri Ratna Dewi Tuszahroh, Nasifah Tuszahroh, Nasifah Utama, Dedi P. Utami, Siska Neeri Utami, Siska Neeri Vivie Sulastri Widhiatuti, Dhanik Rita Widuri, Erlina Estiyanti WIJAYANTI KUSUMA WARDHANI Winarti, Lilik Yadi, Yadi Yana Ulfah Yani Yani Yudha Agus Prayitno Yuliadini Puspita Yulian Andriani Yulian Andriyani Yulian Andriyani, Yulian Yuliani Yuliani Yuliani, Yuliani Zainal Arifin