Analisa Pengaruh Lama Waktu Tahan Tempering pada Perlakuan Panas Terhadap Perubahan Struktur Mikro dan Sifat Mekanik Coupler Baja AAR-M201 Grade E

Rinelda Nena Sagita, Rochman Rochiem, Alvian Toto Wibisono
Submission Date: 2017-01-18 10:38:51
Accepted Date: 2017-03-17 10:12:43

Abstract


Coupler adalah penyambung pada gerbong kereta api satu dengan gerbong yang lainnya. Material coupler adalah baja AAR-M201 Grade E yang spesifikasinya sesuai dengan standar AARManual of Standards and Recomended Practices Couplers and Freight Car Draft Components. Penelitian ini membahas perlakuan panas disertaitempering dan hardening. Tujuan dari penelitian ini adalah menganalisa pengaruh lama waktu tahan terhadap struktur mikro dan sifat mekanik pada baja AAR-M201 Grade E. Proses perlakuan panas yang dilakukan adalah hardening pada temperatur 925oC dengan waktu tahan 3 jam, kemudian di tempering pada temperatur 600oC dengan variasi waktu tahan 2 jam, 3 jam dan 4 jam. Pengujian yang dilakukan pada penilitian ini adalah uji tarik untuk mengetahui kekuatan maksimum, keuletan dan ketangguhan baja. Hasil pengujian metalografi pada tempering menghasilkan struktur mikro asikular ferrit, dan hasil sifat mekanik paling optimal didapat dari proses hardening-tempering pada lama waktu tahan 3 jam, menghasilkan nilai kekuatan tarik 870 MPa, kekuatan luluh 782 MPa, elongasi 14%, reduksi area 38%, kekerasan 264 BHN, kekuatan impak sebesar 35 Joule pada temperatur -40°C dan nilai fatigue life 5100 cycle. Nilai yang dihasilkan seluruhnya memenuhi standar AAR, kecuali nilai elongasi yang hampir memenuhi standar AAR.

Keywords


Baja AAR-M201 Grade; Hardening; Lama waktu tahan; Tempering

References


_______. 2007. Manual of Standards and Recommended Practices. Washington D.C.: The Association of American Railroads.

_______. 2001. Manual of Standards and Recommended Practices: Couples and Freight Car Draft Components. Washington D.C.: The Association of American Railroads.

_______. 2010. ASTM E10 : Standard Test Method for Brinell Hardness of Metallic Materials. ASTM International.

_______. 2002. ASTM E23 : Standard Test Methods for Notched Bar Impact Testing of Metallic Materials. ASTM International.

_______. 2007. ASTM E3 : Standard Guide for Preparation of Metallographic Specimens. ASTM International.

_______. 1998. ASTM E606 - 92 : Standard Practice Strain-Controlled Fatigue Testing. ASTM International.

_______. 2007. ASTM E8/E8M : Standard Test Methods for Tension Testing of Metallic Materials. ASTM International.

_______. 2008. ASTM A370 : StandardTest Methodes and Definition for Mechanical Testing of Steel Products. ASTM International.


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