Abstract
Preliminary Study of Carbide Dissolution during an Ultra-Fast Heat Treatment in Chromium Molybdenum Steel
Highlights
Steel development in the last two decades was driven by the need of the automotive industry to face the challenge of complying with the passenger’s safety standards while maintaining fuel efficiency and minimizing emissions
In order to examine the evolution of microstructure under rapid thermal cycles, typical soft annealed medium carbon chromium molybdenum steel was used with spheroidized carbides (Table 1)
Chemical composition analysis was performed in 30 × 30 mm2 cross sections of the bars, transverse to rolling direction by means of Optical Emission Spectroscopy (OES)
Summary
Steel development in the last two decades was driven by the need of the automotive industry to face the challenge of complying with the passenger’s safety standards while maintaining fuel efficiency and minimizing emissions. The most promising route to achieve these objectives is to minimize the overall car weight. For this purpose as far as steel concerned, the family of Advanced High Strength Steels has been developed with increased mechanical properties than conventional steels [1,2]. Batteries add significantly to the overall car weight. This is why OEMs introduce into their Body-InWhite (BIW) light alloys (e.g. Aluminium and Magnesium) and Carbon Reinforced Plastics (CRP). A good combination of strength and ductility can be achieved via ultra-fine grained nano-precipitated hardened phases, mainly ferritic and bainitic mixtures of retained austenite with martensite, and strengthening mechanisms such as solid solution, carbide precipitation causing dislocation generation and slip and transformation or twinning during deformation [3,4,5,6,7,8,9,10]
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