摘要
利用真空自耗电弧炉+电子束冷床炉双联工艺熔铸TC4合金圆锭,采用铸坯直接斜轧穿孔工艺获得219 mm×16 mm大口径TC4合金无缝管,研究了不同退火温度对管材组织演变与力学性能的影响。结果表明:轧制态管材组织主要由变形魏氏体组织构成,退火处理后片层α相粗化并逐渐相互交错分布,β相晶界消失;随着退火温度不断升高,魏氏体组织转变为网篮组织,管材抗拉强度和屈服强度呈先下降后缓慢增大趋势,而伸长率呈先增大后减小趋势。综合分析认为,所制备的大口径TC4合金无缝管适宜退火温度为850℃左右,此时抗拉强度、屈服强度和伸长率平均值分别为919 MPa、838 MPa和13.1%。
Large diameter TC4 titanium alloy seamless tube with219 mm×16 mm was prepared using VAR+EB fused cast round ingot of TC4 alloy by directly cross piercing,and the effect of annealing temperature on the microstructure and mechanical properties of the seamless tube was investigated.The results show that the as-rolled tube microstructure is mainly composed of deformed widmanstatten structure.After annealing,the lamellarαphase is coarsened and gradually staggered,and theβgrain boundary disappears.With the annealing temperature increasing,the widmanstatten structure transforms into a basketweave structure.The tensile strength and yield strength of the tube decrease first and then increase slowly,while the elongation increases first and then decreases.According to the comprehensive analysis,the suitable annealing temperature of the large-diameter TC4 alloy seamless tube made by the cast slab cross piercing is about 850℃.The average tensile strength,yield strength and elongation are 919 MPa,838 MPa and 13.1%,respectively.
作者
熊汉城
黄海广
李志敏
史亚鸣
张玉勤
蒋业华
Xiong Hancheng;Huang Haiguang;Li Zhimin;Shi Yaming;Zhang Yuqin;Jiang Yehua(School of Materials Science and Engineering,Kunming University of Science and Technology,Kunming Yunnan 650093,China;National-local Joint Engineering Laboratory of Metal Advanced Solidification Forming and Equipment Technology,Kunming Yunnan 650093,China;Engineering Technology Research Center of Titanium Products and Application of Yunnan Province,Yunnan Titanium Industry Co.,Ltd.,Chuxiong Yunnan 651209,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2019年第12期107-111,共5页
Heat Treatment of Metals
基金
国家重点研发计划(2016YFB0301200)
关键词
TC4钛合金
铸坯斜轧穿孔
大口径无缝管
显微组织
力学性能
TC4 titanium alloy
cast slab cross piercing
large-diameter seamless tube
microstructure
mechanical properties
