热处理制度对大直径钛合金管材组织与性能的影响  

Effect of Heat Treatment Processes on Microstructure and Property of Big-Diameter Titanium Alloy Tube

作　　者：李婷[1] 杜宇 赵亮[1] 常江[1] 

机构地区：[1]西北有色金属研究院,陕西西安710016

出　　处：《中国材料进展》2017年第10期765-768,共4页Materials China

摘　　要：采用4种热处理制度对TC4ELI钛合金大直径管材试样进行处理,研究不同热处理制度对其组织与性能的影响。结果表明:经750℃×1 h/AC普通退火处理后,组织为魏氏组织,具有较高的冲击韧性和断裂韧性,强度较低;经900℃×1 h/AC处理后,组织为晶界模糊的魏氏组织,同样具有较高的冲击韧性和断裂韧性,且强度较普通退火有所上升;经930℃×1 h/WQ+580℃×6 h/AC处理后,组织为魏氏组织,α片层较为细小,其断裂韧性(96.8 MPa·m1/2)、强度(892 MPa)、断面收缩率(42%)以及伸长率(16.0%)达到4种处理制度下的最大值,但冲击韧性急剧下降;经930℃×1 h/WQ+650℃×6 h/AC处理后,组织为魏氏组织,晶内α相片层取向呈编织状,具有较高的强度和断裂韧性,冲击韧性较差。Four kinds of heat treatment processes were used to study the effect on the microstructure and properties of the TC4 ELI big-diameter titanium alloy tubes. The results show that after the processing of 750 ℃ ×1 h/AC,the widmanstatten structure is acquired,the impact toughness and fracture toughness are much higher,but the tensile strength is the lowest;after the processing of 900 ℃ × 1 h/AC,the widmanstatten structure with fuzzy grain boundary is obtained,the impact toughness and fracture toughness are as high as that of the previous processing,and the tensile strength is increased; after the processing of 930 ℃ ×1 h/WQ+580 ℃ ×6 h/AC,the widmanstatten structure with very fine α lamellas is obtained,the fracture toughness( 96. 8 MPa·m^(1/2)),tensile strength( 892 MPa),reduction in area( 42%) and elongation( 16. 0%) are the highest among the properties after four kinds of heat treatment processes,while the impact toughness is decreased seriously; after the processing of 930 ℃ ×1 h/WQ+650 ℃ ×6 h/AC,the widmanstatten structure with α phase lamellas interwovened is acquired,the tensile strength and fracture toughness are also higher,but the impact toughness is the lowest value.

关 键 词：钛合金管材 冲击韧性 大直径 热处理制度 

分 类 号：TG14[一般工业技术—材料科学与工程]