Figure 2 shows a time temperature transition diagram for
an unalloyed steel with approximately 0.5 wt.% carbon.
This steel matches very well wheel steels defined by EN
13262 (EN 2004). Three cooling paths 1-3 and the corresponding
micrographs are shown. The desired cooling path for
rim quenching would be somewhat to the left of path 2,
crossing the pearlite region, producing a minimum volume
fraction of ferrite and leaving the bainite and martensite
region untouched.
units of the facility. Time saving maintainability as well as
easy and safe accessibility are two of the aspects of operator
convenience. Of course the above described and widely automated
production process requires operators with a high
degree of competence and proficiency.
5.