Abstract
The effect of heat treatment on the micro-structures and the mechanical properties of 0.002% boron added low carbon steel was investigated. The tensile strength reached the peak at about <TEX>$880-890^{\circ}C$</TEX> with the rising quenching temperature and then the hardness decreased sharply, but the tensile strength hardly decreased. The tensile and yield strength decreased and the total elongation increased with a rising tempering temperature, but the tensile and yield strength sharply fell and the total elongation prominently increased from above a <TEX>$400-450^{\circ}C$</TEX> tempering temperature. Tempered martensite embrittlement (TME) was observed at tempering condition of <TEX>$350-400^{\circ}C$</TEX>. In the condition of quenching at <TEX>$890^{\circ}C$</TEX> and tempering at <TEX>$350^{\circ}C$</TEX>, the boron precipitates were observed as Fe-C-B and BN together. The hardness decreased in proportion to the tempering temperature untill <TEX>$350^{\circ}C$</TEX> and dropped sharply above <TEX>$400^{\circ}C$</TEX> regardless of the quenching temperature.
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