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Surian Pinem
Program Studi Teknik Industri, Universitas Bunda Mulia, Jakarta
Control & Systems Engineering Decision Sciences, Operations Research & Management Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Pengaruh Penuaan Terhadap Karakteristik Paduan Ingat Bentuk Nitinol Surian Pinem
JIEMS (Journal of Industrial Engineering and Management Systems) Vol 1, No 1 (2008): Journal of Industrial Engineering and Management Systems (JIEMS)
Publisher : Universitas Bunda Mulia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30813/jiems.v1i1.54

Abstract

Nitinol is a form of alloy used for shaping memory applications because of its good mechanical properties and stable shape memory effect. The microstructure and transformation temperature is influenced by aging treatment, composition, and addition of elements to the alloy. This study explained the effect of aging treatment on the characteristic of Nitinol. The shape memory alloy with Ti-50.04 % at Ni composition was solution treated at 1000 oC for 1 hour and quenched in water, then aged in temperature of 500 oC, 550 oC, 600 oC, 650 oC and 700 oC for 10 hours. The microstructure was investigated using Scanning Electron Microscopy and mechanical property such as Vickers method. Transformation temperature was measured using resistance measurement technique. The result of microstructure observation showed that the martensitic phase was arranged by lamellar plates which tend to be softer in aging temperature, and the hardness decreased in aging temperature near 600OC - 700OC. The martensitic transformation temperature increased about 4 oC after aging process at 500 oC for 10 hours, but while aging temperature was near 500 oC – 700 oC, there was no significant change of the transformation temperature.Keywords: Shape Memory Alloy, Aging, Nitinol, Martensitic
Nitridasi Bahan Cor-Ten Untuk Meningkatkan Kekerasan dan Ketahanan Korosi Suhu Tinggi Surian Pinem; Elman Panjaitan
JIEMS (Journal of Industrial Engineering and Management Systems) Vol 1, No 2 (2008): Journal of Industrial Engineering and Management Systems (JIEMS)
Publisher : Universitas Bunda Mulia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30813/jiems.v1i2.62

Abstract

Samples of Cor-Ten steels have been subjected to surface treatment, by coating Al and followed by nitridation. High-temperature corrosion tests were carried out using a Thermo Gravimetry Analysis / Magnetic Suspension Balance (TGA/MSB). The Nitridation process was performed at 550°C for 3, 5, 4, 7 and 20 hours under flowing N2 and NH3 gases. Corrosion tests were performed for 50 hours at 650°C. After the oxidation, sample were characterized using X-Ray Diffractometer (XRD) to determine the crystal structure, and then using Scanning Electron Microscope (SEM) to observe the microstructure and hardness of the alloys by aloowing Micro Hardness Tester. It can be concluded that sample nitridized for 5 hours showed the lowest corrosion rate or highest corrosion resistance, due to the corrosion barrier was Al2O3 protective layer. The hardness of Cor-Ten increased from 137 VHN to 340VHN (after nitridation), and to 744 VHN after Al deposition and nitridation for 5 hours. The increase of hardness might be associated with the formation of aluminum nitride.Keywords: Al Deposition, Corrosion Resistant, Cor-Ten, Nitridation, TGA/MSB, XRD, SEM
Co-Authors Elman Panjaitan