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EVENTS & NEWS
How to choose the depth of hardened layer of induction heating furnace quenched parts?
Release time:
Dec 25,2024
source:
How to choose the depth of hardened layer of induction heating furnace quenched parts?
The depth of the hardened layer is generally determined by the working conditions of the quenched part and whether it is ground during use.
(1) For parts that work under friction conditions, the depth of the hardened layer is generally 1.5 ~ 2.0 mm, and the depth of the hardened layer can be larger, 3 to 5 mm, if it needs to be ground after wear.
(2) The depth of the hardened layer of the parts subjected to extrusion and pressure load should be 4~5mm.
(3) The depth of the hardened layer of the cold rolled spokes should be greater than 10mmo
(4) For quenched parts subjected to alternating loads, when the stress is not too high, the effective hardened layer depth can be 15% of the diameter of the part; under high stress, the effective hardened layer depth should be greater than 20% of the diameter to increase The fatigue strength of the part.
(5) The depth of the hardened layer at the shoulder or fillet should generally be greater than 1.5mmo
(6) For shafts with steps subjected to torsion, the hardened layer must be continuous over the entire length, otherwise the torsional strength of the shaft will be lower than that of shafts that have not been quenched by an induction heating furnace due to the interruption of the hardened layer at the transition of the steps.
ingot casting machine The depth of the hardened layer of the quenched parts of the induction heating furnace should have an upper and a lower limit range. The general fluctuation range is 1 ~ 2mm. For example, the depth of the hardened layer is 0.5 to 1.0 mm, 1.0 to 2.0 mm, 1.0 to 2.5 mm, 2.0 to 4.0 mm, 3.0 to 5.0 mm, and so on. The hardness should also have upper and lower limits, such as 56~64HRC, 52~57HRC, 50H
In addition to the factors mentioned earlier
it is crucial to consider the material composition of the parts being quenched in an induction heating furnace. Different materials respond uniquely to induction heating and quenching processes, which can significantly influence the depth and uniformity of the hardened layer. For instance, high-carbon steels typically achieve deeper hardened layers compared to low-carbon steels due to their higher carbon content, which promotes greater hardness upon quenching. Additionally, alloying elements such as chromium, nickel, and molybdenum can enhance the hardenability of the steel, allowing for a deeper hardened layer while maintaining toughness.
Moreover, the quenching medium used also plays a vital role in determining the hardened layer's depth. Water, oil, and polymer quenchants offer varying cooling rates, directly affecting the hardness profile of the quenched parts. Water provides a rapid cooling rate, which can lead to deeper hardening but also increases the risk of warping or cracking, while oil cools more slowly, allowing for better dimensional stability but potentially resulting in a shallower hardened layer.
Finally, it is essential to conduct post-quenching treatments such as tempering, which can relieve residual stresses and enhance the mechanical properties of the parts. By carefully balancing the selection of material, quenching medium, and post-treatment processes, manufacturers can optimize the depth of the hardened layer to meet the specific operational demands and performance requirements of the quenched components. This holistic approach ensures that the parts exhibit the desired combination of hardness, toughness, and fatigue resistance, ultimately leading to improved service life and reliability in their applications.
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