Influence of Nb Addition and Austenitizing Temperature on the Hardenability of Low-Carbon Boron Steels

황병철,; Hwang, Byoungchul

doi:10.3740/mrsk.2015.25.11.577

Cited by 1 publication

(1 citation statement)

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“…Khera [15] investigated the various heat treatment processes on microstructure and hardness with respect to corrosion behavior for carbon steels. Hwang [16] performed some experiments to investigate the influence of Mo addition and austenitizing temperature on the hardenability of low-carbon steels. The effect of quenching media on the mechanical properties of medium carbon steel was also investigated by Zainulabdeen [17].…”

Section: Introductionmentioning

confidence: 99%

Effect of quenching media on mechanical properties of welded mild steel plate

Amosun

Hammed

Lima

et al. 2022

Mech. Eng. for Soc. and Ind.

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Quenching is a swift way of returning metal back to ambient temperature in order to acquire a certain property. Although it is often used to enhance the hardness of metals and their micro-structure, it equally causes a serious variation in the mechanical and physical properties of the metals. This research focuses on quenching media's effect on the microstructure and mechanical properties of a 150mm x 80mm x 8mm welded mild steel plate through microscopic examination, metallography mounting, surface grinding, and surface polishing. Microstructural analysis with hardness and impact test was carried out on the steel plate using water, air, and oil as the quenching media. The results of the test show the Vickers Pyramid Number (HV) for water, oil, and air to be 284.2, 270.9, and 262.2 HV for the base metal, heat affected zone (HAZ), and weld metal (WM), respectively. The amount of energy absorbed by the three specimens during fracture is 23.12, 25.27, and 26.83 J, respectively. The test further indicates that the water-quenched media exhibited mostly martensitic structures and held back austenite with many structures of cementite while the oil and air media exhibited martensite phase and refined grains structures individually. It is therefore concluded that air is more suitable to cool the weld metal for damping applications in engineering.

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Section: Introductionmentioning

confidence: 99%