热处理工艺对TC4钛合金组织和力学性能的影响
|
摘要
通过光学显微镜、扫描电镜、维氏硬度计和拉伸试验机等手段研究了不同热处理工艺对TC4钛合金组织和性能的影响。结果表明:热处理工艺对TC4钛合金的晶粒形态、尺寸和各相占比产生很大影响。经920℃固溶1 h后空冷加530℃时效4 h后空冷获得的双态组织和700℃退火2 h后空冷获得的等轴组织的抗拉强度分别高达986 MPa和987 MPa,且两种组织均具有良好的塑性,经1030℃固溶1 h后空冷加530℃时效4 h后空冷获得的魏氏体组织的抗拉强度低(949 MPa)、塑性差;魏氏体组织的断口SEM照片表现为脆性穿晶断裂为主导,双态组织和等轴组织表现为韧性断裂。魏氏体组织的硬度值最高,等轴组织的硬度值最低,两者的维氏硬度值分别为358 HV0. 1和331 HV0. 1。
The effect of different heat treatments on the microstructure and properties of TC4 titanium alloy were studied by means of optical microscopy,scanning electron microscopy,Vickers hardness tester and tensile testing machine. The results show that the grain morphology,grain size and proportion of each phase of TC4 titanium alloy are greatly affected by heat treatment process. The tensile strength of the duplex microstructure solution treated at 920 ℃ for 1 h and air cooled,and then aged at 530 ℃ for 4 h and air cooled,andequiaxed microstructure solution treated at 700 ℃ for 2 h and then air cooling reach 986 MPa and 987 MPa,respectively,and the plasticity of both microstructures are good,while the tensile strength of the widmanstatten microstructure solution treated at 1030 ℃ for 1 h and air cooled,and then aged at 530 ℃ for 4 h and air cooled are low( 949 MPa) and plasticity is poor. It is showed that the fracture SEM micrographs for widmanstatten microstructure give priority to the brittle transgranular fracture,and the duplex and equiaxed microstructure are ductile fracture. The hardness of the widmanstatten microstructure is the highest,but he hardness of equiaxed microstructure is the lowest. The Vickers hardness values of both microstructure are 358 HV0. 1 and 331 HV0. 1,respectively.
The effect of different heat treatments on the microstructure and properties of TC4 titanium alloy were studied by means of optical microscopy,scanning electron microscopy,Vickers hardness tester and tensile testing machine. The results show that the grain morphology,grain size and proportion of each phase of TC4 titanium alloy are greatly affected by heat treatment process. The tensile strength of the duplex microstructure solution treated at 920 ℃ for 1 h and air cooled,and then aged at 530 ℃ for 4 h and air cooled,andequiaxed microstructure solution treated at 700 ℃ for 2 h and then air cooling reach 986 MPa and 987 MPa,respectively,and the plasticity of both microstructures are good,while the tensile strength of the widmanstatten microstructure solution treated at 1030 ℃ for 1 h and air cooled,and then aged at 530 ℃ for 4 h and air cooled are low( 949 MPa) and plasticity is poor. It is showed that the fracture SEM micrographs for widmanstatten microstructure give priority to the brittle transgranular fracture,and the duplex and equiaxed microstructure are ductile fracture. The hardness of the widmanstatten microstructure is the highest,but he hardness of equiaxed microstructure is the lowest. The Vickers hardness values of both microstructure are 358 HV0. 1 and 331 HV0. 1,respectively.
引文
[1]黄旭,李臻熙,高帆,等.航空发动机用新型高温钛合金研究进展[J].航空制造技术,2014,451(7):70-75.Huang Xu,Li Zhenxi,Gao Fan,et al.Recent development of hightemperature titanium alloys for aeroengine[J].Aeronautical Manufacturing Technology,2014,451(7):70-75.
[2]Takeuchi E,Furuya Y,Nagashima N,et al.The effect of frequency on the giga-cycle fatigue properties of a Ti-6Al-4V alloy[J].Fatigue and Fracture of Engineering Materials and Structures,2008,31(7):599-605.
[3]马玲,赵双群,王战宏,等.热等静压温度对铍铝合金显微组织及力学性能的影响[J].飞航导弹,2006(8):57-59.Ma Li,Zhao Shuanqun,Wang Zhanhong,et al.Effect of hot isostatic pressing temperature on microstructure and mechanical properties of beryllium aluminum alloy[J].Winged Missiles Journal,2006(8):57-59.
[4]赵永庆.高温钛合金研究[J].钛工业进展,2001(1):33-39.Zhao Yongqing.Study on high temperature titanium alloy[J].Titanium Industry Progress,2001(1):33-39.
[5]甘章华,梁宇,王锦林,等.热处理工艺对TC4钛合金组织及硬度的影响[J].金属热处理,2014,39(9):36-40.Gan Zhanghua,Liang Yu,Wang Jinlin,et al.Effects of heat treatment process on microstructure and hardness of TC4 titanium alloy[J].Heat Treatment of Metals,2014,39(9):36-40.
[6]Niu Y,Hou H,Li M,et al.High temperature deformation behavior of a near alpha Ti600 titanium alloy[J].Materials Science and Engineering A,2008,492(1/2):24-28.
[7]顾晓辉,刘君,石继红.淬火、时效温度对TC4钛合金组织和力学性能的影响[J].金属热处理,2011,36(2):29-33.Gu Xiaohui,Liu Jun,Shi Jihong.Influence of quenching and aging temperature on microstructure and mechanical properties of TC4 titanium alloy[J].Heat Treatment of Metals,2011,36(2):29-33.
[8]陈绍楷,田弋纬,常璐,等.钛合金α+β/β转变温度测定的金相法与差热分析法对比研究[J].稀有金属材料与工程,2009,38(11):1916-1919.Chen Shaokai,Tian Yiwei,Chang Lu,et al.A comparative study of differential thermal analysis method and metallographic observation method for theα+β/βtransformation temperature of titanium alloys[J].Rare Metal Materials and Engineering,2009,38(11):1916-1919.
[9]Lütjering G,Williams J C.Titanium[M].New York:Springer Science and Business Media,2007:218-238.
[2]Takeuchi E,Furuya Y,Nagashima N,et al.The effect of frequency on the giga-cycle fatigue properties of a Ti-6Al-4V alloy[J].Fatigue and Fracture of Engineering Materials and Structures,2008,31(7):599-605.
[3]马玲,赵双群,王战宏,等.热等静压温度对铍铝合金显微组织及力学性能的影响[J].飞航导弹,2006(8):57-59.Ma Li,Zhao Shuanqun,Wang Zhanhong,et al.Effect of hot isostatic pressing temperature on microstructure and mechanical properties of beryllium aluminum alloy[J].Winged Missiles Journal,2006(8):57-59.
[4]赵永庆.高温钛合金研究[J].钛工业进展,2001(1):33-39.Zhao Yongqing.Study on high temperature titanium alloy[J].Titanium Industry Progress,2001(1):33-39.
[5]甘章华,梁宇,王锦林,等.热处理工艺对TC4钛合金组织及硬度的影响[J].金属热处理,2014,39(9):36-40.Gan Zhanghua,Liang Yu,Wang Jinlin,et al.Effects of heat treatment process on microstructure and hardness of TC4 titanium alloy[J].Heat Treatment of Metals,2014,39(9):36-40.
[6]Niu Y,Hou H,Li M,et al.High temperature deformation behavior of a near alpha Ti600 titanium alloy[J].Materials Science and Engineering A,2008,492(1/2):24-28.
[7]顾晓辉,刘君,石继红.淬火、时效温度对TC4钛合金组织和力学性能的影响[J].金属热处理,2011,36(2):29-33.Gu Xiaohui,Liu Jun,Shi Jihong.Influence of quenching and aging temperature on microstructure and mechanical properties of TC4 titanium alloy[J].Heat Treatment of Metals,2011,36(2):29-33.
[8]陈绍楷,田弋纬,常璐,等.钛合金α+β/β转变温度测定的金相法与差热分析法对比研究[J].稀有金属材料与工程,2009,38(11):1916-1919.Chen Shaokai,Tian Yiwei,Chang Lu,et al.A comparative study of differential thermal analysis method and metallographic observation method for theα+β/βtransformation temperature of titanium alloys[J].Rare Metal Materials and Engineering,2009,38(11):1916-1919.
[9]Lütjering G,Williams J C.Titanium[M].New York:Springer Science and Business Media,2007:218-238.