Abstract
Leaf spring is a component that accept dynamic loads and provide driving comfort. Leaf springs that have been used for a long time will experience a decrease in the quality that causes fracture. The test of leaf spring includes chemical composition, hardness, fractography and metallography. The results show leaf spring is medium carbon steel of 0.47% C, the average hardness value of broken leaf springs is 419.7 means does not experience significant changes, the microstructure of broken leaf springs was tempered martensitic, has corrosion attack, trans granular cracking, secondary crack and crevice corrosion, and the fracture first occurred in the upper position of the middle leaf springs, while the remaining fractures were at the edges, there was also a corrosion attack on the bottom of the leaf springs, forming rough holes. The initial fracture is marked by the presence of a beach mark. This shape is a characteristic of fatigue fracture. Keywords: chemical composition, hardness, metallography, fractography DOI: 10.7176/CPER/63-04 Publication date: October 31 st 2020
Highlights
Today's technology development is very fast, one of which is in the automotive sector
The hardness Vickers hardness test results resulted in a comparison value of hardness, both for the fractured leaf spring material (Sample A) with an average of 419.7 and with the new leaf spring (Sample B) with an average of 427.3
The results of hardness testing on fractured sample A and new sample B did not experience any significant changes, the comparison value of leaf springs had no effect on hardness
Summary
Today's technology development is very fast, one of which is in the automotive sector. This can be due to the use of leaf springs that have exceeded their service life, extreme road conditions, corrosion, it can be due to excessive loading For this reason, chemical composition tests, hardness tests, metallographic tests at two fault locations and fractography tests need to be carried out to determine and conclude the type of the fracture and its causes. The phase area where the percentage of carbon solution is up to 2% that occurs at a temperature of 1,147 °C is the gamma iron region (γ) or called as austenite which is stable, soft, ductile, easy to form and has a Face Centered Cubic (FCC) crystal structure. At temperatures between 910 °C to 1,390 °C, the iron atoms arrange themselves into an FCC crystal form which is called gamma iron (γ) or the austenite phase This gamma iron can dissolve large amounts of carbon, which is about 2.06% maximum at a temperature of around 1,147 °C. Data anysis The results obtained from each test are studied and the test results are compared between the fractured leaf spring sample (A) and the new leaf spring sample (B)
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