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利用光学显微镜,扫描电镜,电子探针显微分析仪,X衍射分析和硬度测试等手段,研究了淬火温度对铸造Fe-B-Al合金显微组织及硬度的影响。结果表明,铸造Fe-B-Al合金的凝固组织主要由铁素体、珠光体和枝晶间连续分布的网状Fe2B组成。经过900~1100℃淬火后,共晶硼化物出现断网,随淬火温度提高断网现象愈加明显,在1100℃淬火时基体转变为马氏体,网状硼化物基本断裂,并成孤立分布;在900~1050℃淬火时,硬度在37~39 HRC波动但变化不大;在1100℃淬火时,硬度出现突变,达到54.1 HRC。
The effects of quenching temperature on the microstructure and hardness of the cast Fe-B-Al alloy were investigated by optical microscopy, scanning electron microscopy, electron probe microanalyzer, X-ray diffraction and hardness testing. The results show that the solidified microstructure of the cast Fe-B-Al alloy consists mainly of Fe2B with continuous distribution of ferrite, pearlite and dendrite. After 900 ~ 1100 ℃ quenching, the eutectic borides appear broken network, with the quenching temperature increasing the phenomenon of breaking the network more obvious, quenched at 1100 ℃ quenched matrix into martensite, the basic network of boride rupture, and into a separate distribution; When quenched at 900 ~ 1050 ℃, the hardness fluctuated at 37 ~ 39 HRC with little change. When quenched at 1100 ℃, the hardness changed abruptly and reached 54.1 HRC.