【摘要】 采用自制的高压电容器组放电获取衰减正弦特性的脉冲电流 ,对电工纯铁DT4E进行超高能率热处理 ,平均加热速率可达 1 88× 10 6 ℃ /s ,功率密度可以达到 10 9W/m2 量级。试验结果表明 ,当电容器充电电压U0 >5 5kV时试样的晶粒明显细化 ,试样的显微硬度随U0 的增加显著提高。试样被加热至熔断时 ,获得一种由羽毛状、条状组织和块状铁素体组成的复杂组织 ,其显微硬度高达 2 16HV30。电容器脉冲放电进行超高能率热处理是细化金属晶粒尺寸、提高材料力学性能的有效方法。更多还原

【Abstract】 A kind of super-high rate heat treatment of pure iron DT4E was carried out through electro-pulsing with a decaying sine wave obtained from discharge of a group of capacitors,and the average super-high heating rate of about 1.88×10~6℃/s and high power density of about 10~9W/m~2 were achieved.The results show that when the charging voltage of the capacitors exceeds 5.5kV,the grains of the samples become finer and the micro hardness is enhanced distinctly.If the specimen is heated to the melting point,a complex microstructure including some feather-like and lathed structures,and some massive ferrite appears,and the microhardness reaches 216HV30.The super-high rate heat treatment with electro-pulsing is considered an effective method to refine crystalline and improve mechanical properties of metals.更多还原