Abstract
Steel exhibits changes in their phase structure; in the thermal and mechanical properties due to thermal treatments. This work analyzed the influence of tempering temperature on these properties for 1030 steel. Samples were quenched at 850 ºC. Then, they were tempered for 2 h at 200 (QT200), 400 (QT400), 600 (QT600), and 650 ºC (QT650). Thermal, structural, morphological, and mechanical properties of these samples were analyzed and correlated. SEM images show changes in martensite morphology and the carbides presence as a function of tempering temperature. QT600 and QT650 samples with high tempering temperature exhibit the highest presence of carbides. X-ray diffraction shows no changes in the steel structure, but changes in lattice parameters, and crystalline quality improvement. Thermal diffusivity was determined and correlated with the structural changes by temperature effect. The heat transport properties increase as a function of the tempering temperature due to in part because of the structural reorganization, which allows heat transport. Due to the crystal stress release and the martensite tempered the hardness decreases as a function of the tempering temperature.
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