Abstract
The microstructure and properties of a V-Ti microalloyed forging steel was optimized by boron addition. The uneven distribution of boron suppressed the formation of grain boundary ferrite (GBF) and promoted the formation of intragranular ferrite (IGF) idiomorphs. The volume fraction of GBF decreases from 21.2% to 14.3%, while that of IGF idiomorphs increases from 3.5% to 10.2%. After boron addition, the strength of the steel has little change, but the total elongation increases from 21.2% to 23.6%, and the impact energy increases from 38.2 J to 51.4 J, which is attributed to the higher volume fraction of IGF idiomorphs.
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