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·296· 北京科技大学学报 2004年第3期 参考文献 oying and shock compression [J].J Mater Sci Lett,1997, 1陈文革,丁秉均.钨铜基复合材料的研究及进展). 35(2):152 5贾成厂,金雪华.用机械活化与化学活化方法制备 粉末治金工业,2001,11(3):45 2蔡一湘,刘伯武.铜钨复合材料致密化问题和方法 WCu合金[.粉末冶金技术,2001,19(3):148 ).粉末冶金技术,1999,17(2):138 6张丽英,吴成义.一种超细晶粒钨-铜合金的制造方 3吕大铭.我国钨基高压触头材料的生产现状和对今 法P1.中国专利,ZL01144212.3;国际专利.C22C 27/04 后发展的看法[.粉末治金技术,1987,5(3):164 4 Mashimo T,Huang X S.Non-equilibrium W-Cu system 7张丽英,吴成义.气流谐振式超声雾化喷嘴P].中 alloy powder and bulk body prepared by mechanical all- 国专利,ZL94247337.X.1994 Preparation of Nanoscaled WO;-CuO Composite Powders XU Jinlong,ZHANG Liying,LIN Tao,WU Chengyi Materials Science and Engineering School,University of Science and Technology Beijing,Beijing 100083,China ABSTRACT The method of airflow ultrasonic spray thermochemical process was discussed,which can be used to produce nano-scaled amorphous WO,-CuO composite powders directly.The hot decomposition process and the conversion process from amorphous to micro-crystal of the powders were investigated by XRD,TEM and TG-DSC. The results show that it is feasible to industrially produce nano-scaled WO,-CuO composite powders on a large scale by means of airflow ultrasonic spray thermochemical process.The average particle size of WO,-CuO composite powders is less than 50 nm,and their shape is spherical. KEY WORDS airflow ultrasonic spray thermochemical process;nano-scaled composite powder;W-Cu alloy *条举条举条海※*米本米米*米条案条茶姿米套米米米*米米米米***杂米米米半##孝孝米幸春茶米米米米米米米*米米茶米#郑#米装米米米米米米米米米米本*米*米茶据装米妆 (上接第263页) Effect of Relaxation Process and Cooling Rate on Intermediate Phase Transforma- tion Structure Refinement HU Liangjun,SHANG Chengiia,WANG Xuemin,ZHAO Yuntang,HE Xinlai Materials Science and Engineering School,University of Science and Technology Beijing,Beijing 100083,China ABSTRACT The intermediate transformation microstructure of low-carbon bainite steel was analyzed,which had been deformed in the non-recrystallization temperature range,relaxed for a period of time and cooled by various cooling rates.The influence of relaxation process and cooling rate on the intermediate transformation structure type and microstructure refinement was revealed.The results show that in a slowly cooled sample after relaxation the transformation structure is mainly granular bainite and the effect of relaxation refinement is not marked.But while the cooling rate is fast enough (>10C/s),the main microstructure is lath-like bainite,and relaxation effect can be seen clearly.After relaxation,the lath of bainitic ferrite is more fine and sharp,the morphology of M/A constituent is film-like.Comparing with the non-relaxed sample,it is clearly seen that the relaxation of deformed austenite ben- efits to obtain ultra-fine lath-like bainite structure.At the same cooling rate,the amount of M/A constituent decrea- ses in the relaxed sample. KEY WORDS low carbon bainite steel;cooling rate;microstructure refinement;relaxation-precipitation-con- troling process· · 北 京 科 技 大 学 学 报 年 第 期 参 考 文 献 陈文革 , 丁 秉均 钨铜 基 复合材料 的研 究及 进 展 粉 末 冶金 工 业 , , 蔡一湘 , 刘 伯 武 铜 钨 复合 材料 致密 化 问题和 方 法 粉末 冶金 技术 , , 吕大铭 我 国钨基 高压 触 头材料 的生 产现 状和 对今 后 发展 的看法 粉 末冶 金 技术 , , , 一 一 耐 , , 贾 成 厂 , 金 雪华 用 机械 活 化 与化 学 活 化 方法 制 备 曰 合 金 粉末 冶 金 技术 , , 张丽 英 , 吴 成 义 一种超 细 晶粒钨 一 铜 合 金 的制造 方 法 』中 国专 利 , 国 际专 利 , 张 丽 英 , 吴成 义 气 流 谐振 式超声 雾化喷嘴 中 国专 利 , 一 万 , 乙队咬刃 ” , 五五 , 邵 刀 , 们 , , , 一 一 一 , 一 一 一 一 , 一 上 接 第 页 几 月口 , ‘弘侧刃 刀 , 恻刀召 , 乙从咬口 , , , , , 一 , 妙 ℃ , 江 一 此 , , , 灯 一 一 , 一 一 议 毗 , 一 一
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