37 research outputs found
Influence of solution treatment cooling medium on microstructure and elastic modulus Ti-6Al-6Mo for biomedic applications
No full textInfluence of high-pressure torsion on formation/destruction of nano-sized spinodal structures
No full textProses Quenching and Partitioning Terhadap Sifat Mekanik Baja Karbon Medium
No full textBaja WRM 1045 adalah baja karbon sedang yang menawarkan sifat mekanik yang baik dan diterapkan untuk industri otomotif seperti poros engkol. Menurut JIS G4051 bahwa sifat mekanik untuk poros engkol diharapkan memiliki kekuatan luluh ~ 490 MPa, kekuatan tarik minimum, dan perpanjangan 686 MPa dan 17%. Dalam penelitian ini, baja WRM 1045 diproses melalui proses Quenching and Partitioning (Q&P). Itu dilakukan dengan variasi waktu penahanan 30 dan 60 menit selama austenitisasi dan suhu partisi 225, 250, 275, dan 300 ℃. Pengujian tarik, uji kekerasan dan metalografi dilakukan untuk menentukan sifat mekanik dan struktur mikro baja WRM KS1045. Hasil penelitian menunjukkan bahwa sifat mekanik menurun dengan meningkatnya suhu partisi dan waktu penahanan austenit. Semakin tinggi sifat mekanik dicapai setelah waktu tahan austenit 60 menit dan suhu partisi 275 ℃ dengan kekuatan luluh 520,70 MPa, kekuatan tarik 784,63 MPa, perpanjangan 15%, dan kekerasan 93,33 HRB. Analisis struktur mikro optik terdiri dari martensit dan retensi austenit setelah proses Q&P
Microstructure Changes and Mechanical Properties of Stainless Steel Thin Metal Foils After Tensile Testing
No full textThe mechanical properties and changes of microstructure of Austenitic Stainless Steel (ASS) 316L thin metal foils (TMF) were studied through uniaxial tensile tests and SEM-EBSD investigations. The differences in the uniaxial tensile test were observed in SUS 316L with varying grain size (Gs) such as 1.5 um; 3.0 um, and 9.0 um. No. martensitic phase transformation (MPT) occurred in SUS 316 TMF fine grains and coarse grains as indicated in SEM-EBSD results. The microstructure changes were indicated by the change of grain misorientation (GMO) in both SUS 316 TMF fine grains and coarse grains. Furthermore, variations in microstructure were observed in TMF with different Gs
Application of high-pressure torsion to Al-6 %Cu-0.4 %Zr alloy for ultrafine-grain refinement and superplasticity
No full textProduction of Ultrafine-Grained Aluminum Alloys with Unusual Mechanical Properties Using High-Pressure Torsion
No full text主1-参0工学_材料物性工
Grain refinement and high strain rate superplasticity in alumunium 2024 alloy processed by high-pressure torsion
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Penentuan Kadar Sitrat Kertas Rokok pada Hasil Cetakan Kertas secara Konduktometri di PT. Pusaka Prima Mandiri Titi Kuning
No full textIn the process of improving the quality of cigarette paper burning power, the determination of the optimum citrate content is one of the most important things. The proper citrate levels can produce the desired papers burning quality. The determinatoin of citrate content was determined by metrohm conductionometer on paper print result. Measurement of paper citrate content is done by testing 2 times on each part of Front side, Middle side and Back side. The result analysis than that citrate content from cigarette paper are 0,60 to 0,83%. There are some parts that have very high citrate levels, in the first test on the Front side shows results that not meet the standards, but returned to normal on the second test. However, the citrate levels are good and suitable for use is ± 0,67 to 0,70%. And it is not recommended to exceed or less than a standard limit is 0,65 to 0,73%.Dalam Proses peningkatan kualitas daya bakar kertas rokok, penentuan kadar sitrat optimum merupakan salah satu hal terpenting. Kadar sitrat yang tepat dapat menghasilkan kualitas daya bakar kertas yang diinginkan. Penentuan kadar sitrat ditentukan dengan Konduktometer Metrohm pada hasil cetakan kertas rokok. Pengukuran kadar sitrat kertas dilakukan dengan pengujian sebanyak 2 kali pada masing-masing bagian Front side,Middle side dan Back side. Dari hasil analisa diperoleh kadar sitrat dari kertas rokok 0,60 – 0,83%. Ada beberapa bagian yang kadar sitratnya sangat tinggi, pada tes pertama pada bagian Front side menunjukkan hasil yang tidak memenuhi standar, namun kembali normal pada test kedua. Sedangkan kadar sitrat yang baik dan sesuai untuk digunakan adalah ± 0,67 – 0,70%. Dan tidak dianjurkan melebihi atau kurang dari batas standar yaitu 0,65 – 0,73%.Kertas Karya Diplom
Effect of quenching medium on the microstructure of hot rolled Ti-6Al-6Nb alloy for medical application
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