Bainite self accomodating shear strains


Cover design: design & production Gmb H, Heidelberg Typesetting: Digital data supplied by author SPIN: 10885949 62/3020xv-5 4 3 2 1 0 - printed on acid-free paper Preface High speed ground traffic is strongly competitive to air traffic in densely pop- ulated areas like Europe or Japan.

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The symmetry of martensite is usually less than that of the related equilibrium phase—being a subgroup of both the parent crystal and the transformation strains.

The attainment of the fuller symmetry is prevented by local or long-range ordering in the parent phase.

Allotriomorphic ferrite growth is assumed to occur by a paraequilibrium transformation mechanism; its formation is found to determine the development of both Widmanstätten and acicular ferrite.

It seems possible to rationalise the microstructural variations in terms of phase transformation theory, and although the presence of inclusions for the heterogeneous intragranular nucleation of acicular ferrite seems necessary, the inclusions, when present in a concentration beyond a limiting value, do not seem to control the overall development of the microstructure.

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This hypothesis has been discussed in terms of previous work.

L'ordre local ou à longue distance de la phase initiale empêche d'obtenir la symétrie complète.

Des accommodements sont nécessaires, mais pas toujours suffisants, pour augmenter la symétrie (formation de super-groupe) dans les cas où il ya plus d'un atome par maille.

REPORT: Advanced High Strength Steel Workshop held October 22-23, 2006 Arlington, Virginia, USA by Robert H. Smith Chair Department of Materials Science and Engineering The Ohio State University Columbus, Ohio, USA October 31, 2006 Advanced High-Strength Steels (AHSS) Workshop A two-session workshop held on October 22 and 23, 2006, in Arlington, Virginia, brought together a diverse group of 60 scientists and engineers (a) to discuss research issues surrounding Advanced High Strength Steels (AHSS), (b) to recommend ways to address the outstanding issues, and (c) to establish a vision for a path forward for the wide adoption of such materials in the automotive industry.

The workshop was funded by the National Science Foundation, Department of Energy, and the Auto/Steel Partnership.

However, before new generations of AHSS can be adopted and the potential benefits be achieved, many fundamental scientific and technical research issues must be addressed.

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