Effect of torch process on the steels used for bucket, shovel handle, and other high-tonne mining equipment

Effect of torch process on the steels used for bucket, shovel handle, and other high-tonne mining... Background: The gouging torch process using air carbon arc cutting (CAC) device is a standard maintenance procedure carrying out in high-tonne equipment used in the minery industry. The application of this process could locally affect the mechanical properties and the microstructure in the thermally affect zone (HAZ). The changes involve variation in the local carbon concentration and a tempering effect. In commonly used steels in the manufacture of buckets (SAE 5130) and shovel handles (ASTM 514 grade S), the processes influence negatively the work lifetime and the future maintenance works on the device. Methods: Hardness, metallographic analysis trhough optical (OM) and scanning electron microscopy (SEM) were used to evaluate the affected zone. Results: An increasing carbon content up to 2 wt% C was observed in the affected area of the sample, on the slag adhered to it. Presumably, the rest of carbon is lost by evaporation during the process. Conclusions: The hardness measured on the surface of the cut zone shows an increased value for ASTM A 514 grade S, which does not present a notable change for SAE 5130. However, both steels showed a tempering effect. Micro- cracks of 20 to 40 μm appear, and in a few http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png International Journal of Mechanical and Materials Engineering Springer Journals

Effect of torch process on the steels used for bucket, shovel handle, and other high-tonne mining equipment

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Publisher
Springer Singapore
Copyright
Copyright © 2017 by The Author(s).
Subject
Engineering; Theoretical and Applied Mechanics; Structural Materials; Mechanical Engineering
ISSN
1823-0334
eISSN
2198-2791
D.O.I.
10.1186/s40712-017-0086-2
Publisher site
See Article on Publisher Site

Abstract

Background: The gouging torch process using air carbon arc cutting (CAC) device is a standard maintenance procedure carrying out in high-tonne equipment used in the minery industry. The application of this process could locally affect the mechanical properties and the microstructure in the thermally affect zone (HAZ). The changes involve variation in the local carbon concentration and a tempering effect. In commonly used steels in the manufacture of buckets (SAE 5130) and shovel handles (ASTM 514 grade S), the processes influence negatively the work lifetime and the future maintenance works on the device. Methods: Hardness, metallographic analysis trhough optical (OM) and scanning electron microscopy (SEM) were used to evaluate the affected zone. Results: An increasing carbon content up to 2 wt% C was observed in the affected area of the sample, on the slag adhered to it. Presumably, the rest of carbon is lost by evaporation during the process. Conclusions: The hardness measured on the surface of the cut zone shows an increased value for ASTM A 514 grade S, which does not present a notable change for SAE 5130. However, both steels showed a tempering effect. Micro- cracks of 20 to 40 μm appear, and in a few

Journal

International Journal of Mechanical and Materials EngineeringSpringer Journals

Published: Aug 14, 2017

References

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