包芯线技术在Cu-Cr-Zr合金熔铸中的应用

Application of Cored Wire Technology in Smelting-casting Cu-Cr-Zr Alloy

通过冲熔法和包芯线技术将Zr元素添加到熔液中,制备Cu-Cr-Zr合金,比较两种不同方法所得合金的Zr元素收得率,并分析Cu-Cr-Zr合金的铸态显微组织。结果表明,包芯线技术较冲熔法能显著提高Zr元素收得率,提高约32.54%,从而使得生产成本降低。Cu-Cr-Zr合金的铸态组织中主要存在3相,即基体Cu、富Cr相和富CuZr相,不存在富CrZr相,其中富Cr相呈纤维针状和颗粒状,主要分布在基体上,部分Cr与Zr形成三元共晶组织;富CuZr相呈不规则块状,主要分布在晶界上。

Cu-Cr-Zr alloy was successfully prepared with adding Zr by impacting-melting method and by cored wire method,and absorption rate of Zr element in the alloy prepared by the kinds of method was analyzed,meanwhile,as-cast microstructure of the Cu-Cr-Zr alloy prepared was observed.The results show that,compared with that in the alloy prepared by impacting-melting method,Zr absorption rate in the alloy prepared by cored wire method is increased by approximately 32.54%,apparently decreasing the product cost.As-cast microstructure of the Cu-Cr-Zr alloy prepared is composed of matrix Cu,Cr-enrichment phase and CuCr-enrichment phase,and absence of CrZr phase can be observed.Needle-like fiber Cr-enrichment phase or Cr-enrichment particle is mainly distributed into the matrix,and a part of Cr with Zr is reacted to generate ternary phase.Irregular CuZr-enrichment phase is mainly distributed along grain boundary.