Pengaruh waktu proses deep cryogenic treatment terhadap struktur mikro, keausan dan ketahanan korosi paduan Fe-Al-Mn-Mo

JALADRI, GALAH (2022) Pengaruh waktu proses deep cryogenic treatment terhadap struktur mikro, keausan dan ketahanan korosi paduan Fe-Al-Mn-Mo. Other thesis, Institut Teknologi Nasional Yogyakarta.

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Abstract

The Fe-Al-Mn-Mo alloy is an alloy steel that is included in the stainless steel class which
replaces the conventional stainless steel Fe-Cr-Ni alloy. The hardness of the Fe-Al-Mn-Mo alloy
is still lacking because there is still a lot of ferrite structure, the Deep Cryogenic Treatment (DCT)
process is carried out to increase the hardness. This study aims to study the effect of DCT
processing time on the microstructure, wear and corrosion resistance of Fe-Al-Mn-Mo alloys.
The process used was DCT by immersion in liquid nitrogen at a temperature (-196℃) with time
variations of 1, 2, 3, 4, and 5 hours. Then return to room temperature. The results of the chemical
composition test showed that the Fe-Al-Mn-Mo alloy had 76.52% Fe as the main element, 14.11%
Mn as the main alloy, 10.62% Al and 0.45% Mo, while the Fe- Al-Mn-Mo is a high alloy steel.
The results of the microstructure test showed that the Fe-Al-Mn-Mo alloy has a ferrite and austenite structure. The DCT process causes the ferrite structure to get bigger while the austenite
structure gets smaller but the austenite grains will spread more and more between the ferrite
grains. The Fe-Al-Mn-Mo alloy has a corrosion resistance value of 0.03 mpy and the highest
value of corrosion resistance in the 5 hour DCT process is 0.0152 mpy. The Fe-Al-Mn-Mo alloy
has a wear rate of 0.00032 mm³/kg.m and the lowest value in the 5 hour DCT process is 0.00011
mm³/kg.m = Paduan Fe-Al-Mn-Mo merupakan baja paduan yang termasuk dalam baja tahan karat
yang menggantikan baja tahan karat konvensional paduan Fe-Cr-Ni. Kekerasan paduan Fe-AlMn-Mo masih kurang karena masih banyak struktur ferit, proses Deep Cryogenic Treatment
(DCT) dilakukan untuk meningkatkan kekerasan. Penelitian ini bertujuan untuk mempelajari
pengaruh waktu proses DCT terhadap struktur mikro, keausan, dan ketahanan korosi pada
paduan Fe-Al-Mn-Mo. Proses yang dilakukan adalah DCT dengan cara perendaman dalam
nitrogen cair pada suhu (-196℃) dengan variasi waktu 1, 2, 3, 4, dan 5 jam. Lalu dikembalikkan
pada suhu ruangan. Hasil uji komposisi kimia menunjukkan paduan Fe-Al-Mn-Mo memiliki
unsur utama Fe sebesar 76,52%, unsur paduan utama Mn sebesar 14,11%, Al sebesar 10,62%
dan Mo sebesar 0,45% sedangkan paduan Fe-Al-Mn-Mo termasuk baja paduan tinggi. Hasil
uji struktur mikro menunjukkan paduan Fe-Al-Mn-Mo memiliki struktur ferit dan austenite.
Proses DCT menyebabkan struktur ferit semakin besar sedangkan struktur austenite semakin
kecil namun butir austenite akan semakin menyebar di antara butir ferit. Paduan Fe-Al-Mn-Mo
memiliki nilai ketahanan korosi sebesar 0,0300 mpy dan nilai tertinggi ketahanan korosi pada
proses DCT 5 jam sebesar 0,0152 mpy. Paduan Fe-Al-Mn-Mo memiliki nilai laju keausan
sebesar 0,00032 mm³/kg.m dan nilai terendah pada proses DCT 5 jam sebesar 0,00011
mm³/kg.m.

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