Originally Posted by
juergenwt
D-2 does not move in Heat Treating.
Actually while most most tool steels will grow between about 0.0005" and 0.002" per inch of original length during heat treatment, due to the changes in microstructure, D2 is a bit anomalous and under some circumstances can shrink. This occurs when the austenite to martensite transition does not go to completion during the (air) quenching, possibly because the steel was held either too long or at to high a temperature. The martensite transition can be pushed to completion by cryogenic treatment followed by tempering.
An open mind is a virtue...so long as all the common sense has not leaked out.