摘要:
研究了钛含量为0.67%~1.82%的Fe-C-B-Ti合金在铸态和热处理下微观组织、硬度和冲击韧性的变化规律。结果表明:当钛含量为0.67%时,Fe-C-B-Ti铸态合金组织由马氏体、珠光体和网状的共晶硼化物组成,硬度和冲击韧性较高。随钛含量的增加,Fe-C-B-Ti合金铸态组织中的马氏体逐渐消失,出现铁素体,硬度和冲击韧性逐渐下降。热处理后,Fe-C-B-Ti合金中的共晶硼化物呈断网状,并随温度的升高有明显粗化。随淬火温度的升高,Fe-C-B-Ti合金的硬度和冲击韧性增加,在1 050℃时达到最大值,当温度超过1 500℃时,硬度和冲击韧性反而降低。
Abstract:
The microstructure,hardness and impact toughness of as-cast or quenched Fe-C-B-Ti alloy containing 0.67%~1.82% of Ti were studied.The results show that the microstructures of the as-cast Fe-C-B-Ti alloys containing 0.67% of Ti consist of martensite,pearlite and reticular eutectic boride with high hardness and impact toughness.With the increase of titanium content,the martensite of the as-cast Fe-C-B-Ti alloy gradually disappears,and ferrite appears,which results in gradual decrease of hardness and impact toughness.After heat treatment,the reticular eutectic borides of the alloys are broken,and grow coarser noticeably with the increase of temperature.As the quenching temperature arises,the hardness and impact toughness of the Fe-C-B-Ti alloy increase,and achieve maximum value at 1 050℃ while they decrease over 1 050℃.
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