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Stress relieving
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Proceedings Papers
HT 2021, Heat Treat 2021: Proceedings from the 31st Heat Treating Society Conference and Exposition, 105-109, September 14–16, 2021,
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After manufacturing coil springs, internal stresses exist within the steel wire. These stresses can lead to defects and may impact the working lifespan of springs. Stress must be relieved to maximize the elastic properties of the spring alloys. Stress relief is a critical step during the manufacturing process, typically using large belt furnaces and convection ovens. The fluidized bed heat treatment system is an alternative for stress relief of small- and medium-sized coil springs. Springs are suspended in a parts basket and deposited into a fluidized bed furnace, consisting of fine aluminum oxide particles gently mixed by an upward air flow. With its high heat transfer coefficient, fluidized bed relieves the stress in coil springs in significantly less time than other conventional heat treatment methods. Bed temperature is accurately controlled using either electric heaters, with excellent thermal uniformity throughout the working area of the bed. Fluidized bed, with its advantages of uniformity and quick turnaround time, render it the best option for the rapid and efficient stress relief processing of coil springs and heat treatment of other metal components.
Proceedings Papers
HT2015, Heat Treat 2015: Proceedings from the 28th Heat Treating Society Conference, 1-5, October 20–22, 2015,
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Larsen Miller is a formula used to calculate broad equivalent Thermal Effect (TE) stress relieving and tempering recipes. However, results are not precise. The purpose of this work is to determine a more exact procedure. ANOVA design of experiment was used and three supplemental variables were identified as a source of thermal effect variances added to temperature and time: ramp rate, soak time and correlation between Temperature and Soak time. It was then possible to predict the most effective process temperature and soak time necessary to produce the desired stress relief as defined by the angle position of a torsion spring. The results apply to one spring type and one configuration. More work is necessary to expand the methodology to families of parts, i.e. compression springs.
Proceedings Papers
HT2015, Heat Treat 2015: Proceedings from the 28th Heat Treating Society Conference, 358-364, October 20–22, 2015,
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This paper presents the results of an experimental investigation of the effect of three types of post-heat treatments: 1) solution treatment and aging, 2) stress relieving, and 3) annealing on the corrosion behavior of Ti-6Al-4V fabricated via direct metal laser sintering (DMLS). The microstructure and phase evolution as affected by heat treatment temperature were examined through scanning electron microscopy and via x-ray diffraction. The Vicker’s microhardness, as it was affected by various heat treatments, was compared. The corrosion behavior of the specimens was measured electrochemically in simulated body fluid at 37°C. It was found that the nonequilibrium α’ phase with a small amount of β nuclei was formed in the as-fabricated sample. Heat treatments allow the formation of the β phase and the agglomeration of β precipitates to occur at elevated temperatures. Transformed β phase with various morphologies was observed as a result of the heat treatments. Different degrees of improvement in the corrosion resistance were observed in the solution-treated and aged samples, 650 °C stress relieved, and annealed samples.