The P/M Vanadis 6 cold work steel was austenitized, quenched and tempered. For selected sets of
specimens, also sub-zero period was inserted between quenching and tempering. The structure, hardness
and three point bending strength was investigated as a function parameters of heat treatment. The asquenched hardness of the material raises with the use of the sub-zero period. On the other side, the use of
sub-zero period results in a slight hardness decrease of the as-tempered material. Furthermore it was found
that the three point bending strength decreased markedly with increased austenitizing temperature and also
slightly with the use of sub-zero treatment. The lowering of bending strength with increasing austenitizing
temperature can be considered as natural because of the austenitic grain growth. On the other hand, the
lowering of bending strength due to the use of sub-zero processing can not be explained as simply as
expected on first sight. The situation is more complex since the hardness behaves in a rather surprising way,
which is discussed in the paper.
The P/M Vanadis 6 cold work steel was austenitized, quenched and tempered. For selected sets ofspecimens, also sub-zero period was inserted between quenching and tempering. The structure, hardnessand three point bending strength was investigated as a function parameters of heat treatment. The asquenched hardness of the material raises with the use of the sub-zero period. On the other side, the use ofsub-zero period results in a slight hardness decrease of the as-tempered material. Furthermore it was foundthat the three point bending strength decreased markedly with increased austenitizing temperature and alsoslightly with the use of sub-zero treatment. The lowering of bending strength with increasing austenitizingtemperature can be considered as natural because of the austenitic grain growth. On the other hand, thelowering of bending strength due to the use of sub-zero processing can not be explained as simply asexpected on first sight. The situation is more complex since the hardness behaves in a rather surprising way,which is discussed in the paper.
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