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All Journal Rotasi Jurnal Sains Materi Indonesia Jurnal Sains dan Teknologi Nuklir Indonesia (Indonesian Journal of Nuclear Science and Technology) IPTEK Journal of Proceedings Series SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Journal of Mathematical and Fundamental Sciences Journal of Engineering and Technological Sciences Jurnal Mechanical Mesin PROCEEDING STIMA Jurnal Teknologi Bahan dan Barang Teknik Metalurgi
Rochim Suratman
Institut Teknologi Bandung
Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemistry Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Physics

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Dynamic Plastic Deformation Induced by Repetitive Hammering on Cr-Mn Austenitic Stainless Steel Syahwira Taqwa Triadi; Cherly Selindiana; Hermawan Judawisastra; Aditianto Ramelan; Rochim Suratman
Metalurgi Vol 37, No 1 (2022): Metalurgi Vol. 37 No. 1 April 2022
Publisher : National Research and Innovation Agency (BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (764.094 KB) | DOI: 10.14203/metalurgi.v37i1.618

Abstract

Austenitic stainless steels have advantages, such as high ductility and good corrosion resistance. The cold working process can increase the hardness and strength of the material. However, because a metastable austenite phase occurs in that material, there is a phase change of γ austenite to α’-martensite and ε-martensite, which will reduce the ductility and its corrosion resistance. The strengthening process with dynamic plastic deformation (DPD) can prevent the formation of martensitic phases through repeated impact at high strain rates. This study analyzed microstructures and hardness evaluation on Cr-Mn austenitic stainless steel due to dynamic plastic deformation through the repetitive hammering method. Repetitive hammering with a strain rate of 6,2 s-1 on Cr-Mn austenitic stainless steels was carried out on five specimens with variations in the impact of 50, 100, 150, 250, and 350 times with impact energy of 486 J/cm2, 2.207 J/cm2, 2.569 J/cm2, 6.070 J/cm2, and 11.330 J/cm2 respectively. Microstructure, hardness, and XRD (X-ray diffraction) analyses were carried out on specimens before and after repetitive hammering. Metallography was carried out to observe the microstructure using an optical microscope. The hardness was tested through the Rockwell A hardness test. XRD examination was used to identify the phases formed and indications of nano-twins. The repetitive hammering process up to 350 times has succeeded in increasing hardness from 53.5 HRA to 71.6 HRA. Plastic deformation introduced by repetitive hammering produced slip bands, cross bands, wavy bands, and indication of nano-twins formation and increased the hardness. 
The Material Science Behind Repetitive Hammering, Solution Annealing, and Tempering on Hadfield Steel Ida Farida; Rochim Suratman
Journal of Engineering and Technological Sciences Vol. 55 No. 4 (2023)
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2023.55.4.4

Abstract

The Hadfield steel used in this study contained 11 to 14% Mn and 1.1 to 1.4% C. Hadfield steel that underwent heat treatment showed insignificant differences in microstructure and hardness. On the other hand, Hadfield steel that was subjected to heat treatment combined with repetitive hammering exhibited changes in microstructure, as indicated by the presence of more and denser slip lines in accordance with an increased amount of deformation. The hardness value of the Hadfield steel also significantly increased. The slip lines discovered in the Hadfield steel that underwent solution annealing and tempering followed by repetitive hammering increased in number and appeared more compact than in the Hadfield steel without tempering. Additionally, the hardness value of the Hadfield steel with tempering was higher than that of the Hadfield steel without tempering. The strain values and thickness reduction results showed that the Hadfield steel subjected to tempering had higher strain and thickness reduction than the Hadfield steel without tempering. Higher strain and thickness reduction leads to higher hardness.
Co-Authors Agus Suprihanto Agus Suprihanto Ahmad Afandi Ako, Henry Ali Rinaldi Andoko W Azis Azis Azis Azis, Azis B Widyanto Bagus Budiwantoro Bambang Sutjiatmo Bambang Widyanto Bandanadjaja, Beny Basuki, Arif Batam W, Durman Beny Bandanadjaja Budi Prawara Budi Prawara Cakranegara, Pandu Adi Cherly Selindiana Dian Susanto Dikdik Kuswaya Djoeli Satrijo Durman Batam W Erie Martides Ferdian Marta Gilang Gumilar Gunawan Refiadi Handojo Handojo Handojo Handojo Hariadi Tri Prasetia Haris Wahyudi Hendy Roesma Wardhana Henry Ako Hermawan Judawisastra Ida Farida IGN Wiratmaja Puja IGN Wiratmaja Puja Imin Abdulah Irma Pratiwi Kurniawan Kurniawan Kuswaya, Dikdik M, Sudin Mardiyati Mardiyati Mardiyati, Mardiyati Muchsin Muchsin Novrita Idayanti Nurdesri Srahputri Permana, Muki Satya Prasetia, Hariadi Tri Ramdan, Raden Dadan Ramelan, Aditianto Rd. Dadan Ramdan Reza Reza Reza, Reza Riona I. Media Riza Wirawan Santosa, Sigit Puji Satryo S. Brodjonegoro Setiawan, Asep Ridwan Sinta Rismayani Siswahyudianto Srahputri, Nurdesri Steven Steven Steven Steven Sudin M Surdia, Tata Sutjiatmo, Bambang Syahwira Taqwa Triadi Tata Surdia Tatacipta Dirgantara, Tatacipta Tri P Widyanto, B Yudiyanto, Oyok