摘要
利用自行研制的高梯度定向凝固水平连铸设备对Cu-1.0Cr自生复合材料的制备过程进行了研究。结果表明,炉口温度、冷却强度、连铸速度等参数相互匹配对合金固液两相区的控制尤为重要,也直接影响连铸线材的表面质量和内在定向组织;在稳定凝固速率为245μm/s时,内部组织形貌为共晶相(α+β),与初生α相平行、沿轴向均匀呈连续纤维层状排布,而在低速凝固过程中,初生α相呈现为胞状组织特征,其长大方向受热流方向的约束。
We have developed a high gradient unidirectional solidification horizontal continuous casting apparatus to investigate the preparation process of Cu-Cr in-situ composites.It was revealed that inter-matching among parameters,including glory-hole temperature,cooling intensity and drawn velocity,has the significant effects not only on the control of liquid-solid zone but also on the surface quality and internal unidirectional structure of the Cu-Cr bar.With the drawn velocity keeping 245 μm/s,the microstructure is composed of eutectic (α+β) phase and primary α phase,in which the eutectic (α+β) phase is parallel to primary α phase,uniformly arranged along axial direction with the continuous fibres,while primary α phase exhibits cellular character at a low drawn velocity,restrained by thermal flow in growth direction.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2005年第9期562-564,共3页
Special Casting & Nonferrous Alloys
基金
国家自然科学基金重点资助项目(50432020)
中国科学院兰州化学物理研究所开放基金资助项目
关键词
定向凝固
水平连铸
Cu-Cr自生复合材料
微观组织
Unidirectional Solidification,Horizontal Continuous Casting,Cu-Cr In-situ Composites,Microstructure
