纯钛挤压管坯内孔铜包套破裂成因分析及预防措施  

Factors Analysis and Preventive Measures of Pure Titanium Tube Blank Internal Copper Canning Cracking

作　　者：谢翀博[1] 王成长[1] 朱梅生[1] 马建明[1] 陈贵曾[1] 晁鸿涛[1] 

机构地区：[1]西北有色金属研究院稀有金属材料加工国家工程中心,西安710016

出　　处：《材料工程》2012年第9期1-6,共6页Journal of Materials Engineering

摘　　要：针对纯钛挤压管坯内孔铜包套破裂现象,通过金相、能谱及XRD分析对破裂铜包套表面的第二相进行了成分、物相和成因分析。结果表明:铜包套和纯钛锭坯相接触表面的第二相是Cu3Ti;包套破裂的主要原因是挤压比增大(从14.2提高到22.9)引起摩擦热和变形热增大,原半流体油基润滑剂的润滑效果不良,导致铜包套和纯钛管坯局部温度升高(>850℃),并在短时间内(<10s)发生Ti-Cu反应,导致铜包套撕裂脱落。通过实验确定了预防铜包套破裂的关键措施。The cracking of internal copper canning during pure titanium tube blank extruding was stud- ied. The second phase on the cracked copper canning surface was analyzed by metallography, energy spectrum and XRD. The cause of second phase formation and its effect on the copper canning cracking was also analyzed. The results show that the compounds on the copper canning surface which contact to the internal surface of pure titanium extruded tube blank are Cu3 Ti. The friction and distortion heat increase significantly when extrusion ratio increases, leading to the failure of oil-base lubricant, the ti- tanium reacts with copper to yield Cu3Ti within 10s due to the elevated temperature（〉850℃）, lead- ing to the cracking of internal copper canning. Following the test results, the preventive measures to avoiding the internal canning cracking and internal pits were put forward.

关 键 词：纯钛管坯 挤压 铜包套 

分 类 号：TG379[金属学及工艺—金属压力加工]