PENGARUH TEMPERATUR TEMPERING TERHADAP KEKERASAN DAN STRUKTUR MIKRO BAJA AISI 1045 YANG DIQUENCHING DALAM MEDIA PENDINGIN TERSIRKULASI

JURNAL ILMIAH TEKNIK MESIN Pub Date : 2020-01-28 DOI:10.23960/fema.v8i2.3

H. Mustofa, Harnowo Supriadi, Zulhanif Zulhanif

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Abstract

Steel AISI 1045 is steel classified as medium carbon steel because it has a carbon content of 0.45%.The characteristics of steel itself are sometimes not in accordance with the needs required,therefore the steel requires other treatments to change the properties and structure of steel AISI1045. The characteristics of steel can be changed by giving heat treatment, one of the processescarried out is the quenching tempering process. Quenching is a metal working process with rapidcooling to a predetermined variety of media with the aim of increasing the hardness of AISI 1045steel, while tempering is the process of reheating hardened steel with the aim of obtaining hightenacity and toughness.The quenching process uses a temperature of 800 °C with a waiting time of60 minutes and then cooled quickly with variations of diesel, water, and salt water with a 180°circulating process. While the tempering temperature variations used are 450 °C, 550 °C, and 650°C with a waiting time of 60 minutes. The results of the hardness test using the Rockwell method. inraw material testing get a value of 61.33 HRB hardness. The quenching results circulated in thesolar media are (80.6 HRB, 79.3 HRB, 81.3 HRB), the value of violence in the water media (89.3HRB, 89 HRB, 89.6 HRB), and salt water media (94,6 HRB, 96 HRB, 94.6 HRB). The hardnessvalue of temperature temperament 450 °C solar media (72.6 HRB 73 HRB, 72.6 HRB), water media(83.6 HRB, 82.6 HRB, 83 HRB), salt water (86.3 HRB, 86.6 HRB, 87.3 HRB). Temper temperaturehardness value of 550 ° C solar media namely (70.3 HRB, 70.3 HRB, 70.6 HRB) water media (81.3HRB, 81.3 HRB, 80.6 HRB) salt water media (84,3 HRB, 83.6 HRB, 84.6 HRB). The hardness valueof temperature variation of 650 °C, solar media are (68.3 HRB, 68.6 HRB, 68.6 HRB) water media(79 HRB, 79.3 HRB, 79.3 HRB) and salt water media (81,3 HRB, 81.6 HRB, 82 HRB). Themicrostructure obtained in quenching is the martensite structure and the tempering structure istemper martensite.Keywords: AISI 1045, quenching, tempering, martensite, ferrite, pearlite, HRB

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温度压制对循环冷却介质中淬炼的1045钢微钢结构的影响

钢AISI 1045被归类为中碳钢，因为它的含碳量为0.45%。钢本身的特性有时不符合需要，因此需要对钢进行其他处理来改变钢的性能和组织。钢的特性可以通过热处理来改变，其中进行的工艺之一是淬火回火工艺。淬火是一种快速冷却到预定介质的金属加工过程，目的是提高AISI 1045钢的硬度;回火是将淬火后的钢再加热的过程，目的是获得高韧性和韧性。淬火过程使用温度为800°C，等待时间为60分钟，然后用柴油，水和盐水的变化快速冷却，180°循环过程。而使用的回火温度变化为450°C, 550°C和650°C，等待时间为60分钟。采用洛氏法进行硬度试验的结果。在原料测试中得到硬度值为61.33 HRB。在太阳介质中循环的淬火结果为(80.6 HRB, 79.3 HRB, 81.3 HRB)，在水介质中循环的强度值为(89.3HRB, 89 HRB, 89.6 HRB)，在盐水介质中循环的强度值为(94,6 HRB, 96 HRB, 94.6 HRB)。450°C太阳介质(72.6 HRB、73 HRB、72.6 HRB)、水介质(83.6 HRB、82.6 HRB、83 HRB)、盐水(86.3 HRB、86.6 HRB、87.3 HRB)的温度气质硬度值。回火温度硬度值为550℃的太阳介质即(70.3 HRB、70.3 HRB、70.6 HRB)水介质(81.3HRB、81.3HRB、80.6 HRB)盐水介质(84,3 HRB、83.6 HRB、84.6 HRB)。650℃温度变化时，太阳介质的硬度值分别为(68.3 HRB、68.6 HRB、68.6 HRB)水介质(79 HRB、79.3 HRB、79.3 HRB)和盐水介质(81,3 HRB、81.6 HRB、82 HRB)。淬火组织为马氏体组织，回火组织为回火马氏体组织。关键词:AISI 1045，淬火，回火，马氏体，铁素体，珠光体，HRB

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