PENGARUH VARIASI MEDIA QUENCHING PADA PROSES AUSTENISASI DAN TEMPERING TERHADAP KEKERASAN DAN STRUKTUR MIKRO BESI COR NODULAR (FCD 500)

MUBAROKAH, UMIYATUL (2019) PENGARUH VARIASI MEDIA QUENCHING PADA PROSES AUSTENISASI DAN TEMPERING TERHADAP KEKERASAN DAN STRUKTUR MIKRO BESI COR NODULAR (FCD 500). Skripsi thesis, Institut Teknologi Dirgantara Adisutjipto.

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Abstract

This research was conducted to identify the effect of heat treatment with the variety of quenching media such as: water, brine, and mixture water oil and the effect of tempering after quenching for hardness value and micro structure of ductile cast iron. Heat treatment began with austenization at 900°C with a holding time of 60 minutes then quenched with variety of 100 % water, brine (25% salt), and mixture 80 water : 20 oil, followed by tempering at 400°C with a holding time of 120 minutes. The research showed that on micro structure test samples that was quenched with brine showed grafit nodules, sharp martensite and resolute shape with 556 HB average of hardness value. Samples that was quenched with water and water oil mixture had almost the same micro structure that showed grafit nodules, martensite, pearlite, and ferrite but had a different hardness value for 545 HB and 477 HB. Tempering process changed the sample’s micro structure from martensite to pearlite and ferrite, it also decreased the hardness value. Hardness value from tempering process for samples that used brine as the quench media was 453 HB, sample that use water was 445 HB, and sample that use water oil mixture was 392 HB.

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