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A1 Alloy
A2 Solution
A3 Simulation
A4 Texture
A5 Underwater
A6 Lamelar
A7 Pump
A8 Engine
A9 Prediction
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| Metallurgical Science & Technology |  |
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| __________________________________________________________________________________________ This Site is presented especially for those who are interested in journal of Metallurgical Science and Technology. You can read it and tell me if there is something to be corrected and I hope you invite me to discuss for any further research regarding any of these materials including their manufacturing processes. __________________________________________________________________________________________ ......See you to the next report !! __________________________________________________________________________________________ PROJECT LISTS OF RESEARCH (click, upper left corner): A01. Alloy Design & Casting Practice of Hadfield's Manganese Steel (MSP-RS) A02. Effect of Solution Treatment On HM Steel Microstructure (MSP-RS) A03. Heat Transfer Simulation Using FEM Ansys Software (MSP) A04. Deformation Texture On Austenitic Stainless Steel AISI-304 (MSP-BHS-MS) A05. Underwater Welding by Using SMAW (RS-HSO-MSP) A06. Lamelar Tearing Inspection On Weldment Structure (RS-HSO-MSP) A07. Design Process and Casting Practice of Centrifugal Pump (MSP-TS) A08. Design Process and Die Casting of Engine Block for Grass Cutting (MSP) A09. Prediction Of Shape Distorsion For Quenched Plain Steel By Using FEM Analysis (SY-RHS-MSP) A10. Pitting Corrosion of Weld Seam in Longitudinal Welded Pipe, API 5L Grade X-52 (CNB-MSP-RS) A11. How to Repair and Join Dissimilar Metal For Hadfield Manganese Steel and Plain Carbon Steel (MSP-HSO-RHS) A12. Very High Toughness of Aluminium Alloys __________________________________________________________________________________________ * For detail information, Please contact me by sending massage to the e-mail below. It's free, No Credit Card !! I just want to share information and discuss about steel research especially for Austenitic Manganese Steel. ** The researchs above (A1 - A3) have been presented at FTUI Seminar 1999, Jakarta and sent to the Journal of Metallurgical Science & Technology, Italy. So, you can get them completely! (click A1, upper left corner)!!! *** For point A4, It's still further research about Annealing Texture and has been completely done by the other researcher. The complete report is available. ABSTRACT (A1 - A3) Examination of the as-cast austenitic manganese steel containing 1.17% C and 13.02% Mn exhibited the formation of carbides along austenite grain boundaries and other interdendritic areas due to Mn and C segregation. The gray carbide at grain boundaries was observed showing cellular/lamellar structure at higher magnification. Some of white contrast carbides exist within the grain. Segregation and carbide precipitation were studied using scanning electron microscope and electron probe microanalyzer. In this work, observation has been performed to understand the effect of solution treatment on the carbide dissolution during solutionizing at the austenitizing temperature. This experiment is for casting weighing 0.4 kg and 12.5 mm in section size. A single austenite phase at a cross section specimens was obtained for rapid and step heating procedure in which their holding time were 45 minutes - 6 hours at 1050oC. In contrast, no holding time was required for slow heating procedure due to lower rate of heating up about 18o/s. Observation on the surface exhibited decarburization, it may be by furnace gas during heating. This surface has depth 0.2-3 mm below the casting surface and formed partly martensitic structure. ABSTRAK (A1 - A3) Pengamatan terhadap coran baja mangan Hadfield dengan paduan utama 1.17% C dan 13.02% Mn menunjukkan adanya formasi karbida di sepanjang batas butir austenit dan daerah antar dendrit akibat segregasi. Karbida pada batas butir membentuk struktur selular/lamelar pada pembesaran yang tinggi sedangkan karbida yang lebih terang berada pada butir. Adanya segregasi dan presipitasi karbida tersebut telah dipelajari dengan menggunakan SEM dan EPMA. Untuk meningkatkan ketangguhan baja, diperlukan proses solution treatment pada temperatur austenisasi dengan tujuan untuk menguraikan karbidanya. Percobaan ini dilakukan pada coran baja dengan massa 0,4 kg dan tebal 12,5 mm yang dipanaskan pada temperatur austenisasinya kemudian dicelup cepat ke dalam air pada temperatur kamar. Melalui prosedure pemanasan cepat dan bertahap pada temperatur 1050oC dengan waktu penahanan 45 menit-6 jam di dalam tungku, dihasilkan struktur mikro yang seluruhnya berupa fasa austenit. Tetapi dengan prosedure pemanasan lambat tidak diperlukan waktu penahanan karena laju pemanasannya rendah yaitu 18o/s. Pengamatan pada permukaan menunjukkan adanya dekarburasi akibat reaksi gas dalam tungku selama pemanasan. Ketebalan permukaan akibat dekarburasi adalah 0.2-3 mm dan membentuk struktur martensit. |
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