摘要
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 microstructure and hardness of Fe-B-Al alloy were investigated by optical microscopy( OM),scanning electron microscopy( SEM),electron probe micro-analyzer( EPMA),X-ray diffraction( XRD),and Rockwell hardness test. The results indicate that the as-cast microstructure of Fe-B-Al alloy consists of ferrite,pearlite and the netlike boride Fe2 B which is distributed in the grain boundary. After quenching between 900 ℃ and 1100 ℃,the netlike eutectic borides are broken up and the breaking tendency increases with the increasing of quenching temperature. After quenching at 1100 ℃,the matrix transformed to martensite and the netlike boride almost totally fractured. When quenching at 900-1050 ℃,the hardness is fluctuating between 37 and 39 HRC but changed little. However,after quenching at 1100 ℃,the hardness of the alloy has a sharp increase to 54. 1 HRC.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2015年第4期174-178,共5页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(51274016)
北京市自然科学基金(2142009)
