Abstract
The effects of arsenic and tin, which seem to be harmful to the toughness of steel, on the tempering process of highly pure Fe-1.0%C alloy were investigated. The contents of these elements were 0.5% or less for arsenic and 0.2% or less for tin. Resistivity measurements and transmission electron microscopy were carried out during the course of isochronal tempering.
The results are as follows:
(1) 0.5% arsenic retards the third stage, where cementite precipitates. It also has effects on suppressing the second stage where retained austenite decomposes, and the fourth stage where recovery and recrystallization occur.
(2) The fourth stage of tempering is suppressed as the content of tin increases.
