摘要
系统研究了热处理工艺对选区激光熔化Ti6Al4V合金组织、力学性能和耐磨性的影响。结果表明,沉积态样品组织以针状α'马氏体为主,经固溶处理后,针状α'马氏体分解,Ti6Al4V合金硬度下降。当固溶温度为800℃时,合金形成α'/α结构,其抗拉强度和延伸率分别增加12%和23%。当固溶温度达到900℃以上时,由于α'/α结构的消失、α相晶粒的粗化以及β相含量的增加,合金的力学性能急剧下降,抗拉强度从(935±10)MPa下降到(815±9)MPa,伸长率从(8.72±0.2)%下降到(3.09±0.1)%。随着固溶温度的升高,摩擦系数和磨损率线性增大,与硬度的变化趋势完全相反,且磨损机理由单一磨粒磨损转变为磨粒磨损和氧化磨损。
The effects of heat treatment on the microstructure,mechanical properties and wear resistance of Ti6Al4V alloy melted by selective laser melting were systematically studied.The results show that the structure of as-built sample is mainly composed of acicularα'martensite.After solution treatment,the acicularα'martensite decomposes,which leads to the decrease of the hardness of Ti6Al4V alloy.When the solution temperature is 800℃,the alloy forms anα'/αstructure,which increases the tensile strength and elongation of the alloy by 12%and 23%,respectively.When the solution temperature reaches above 900℃,the mechanical properties of the alloy decrease sharply due to the disappearance of theα'/αstructure,the grain coarsing ofαphase and the increase of the content ofβphase.The tensile strength decreases from(935±10)MPa to(815±9)MPa,and the elongation decreases from(8.72±0.2)%to(3.09±0.1)%.With the increase of solution temperature,the friction coefficient and wear rate increase linearly,which is completely opposite to the changing trend of hardness,and the wear mechanism is changed from single abrasive wear to abrasive wear and oxidative wear.
作者
邱应堃
王林志
张祺
Qiu Yingkun;Wang Linzhi;Zhang Qi(Department of Materials Engineering,Sichuan Engineering Technical College,Deyang 618030,China;Chongqing Institute of Green and Intelligent Technology,Chinese Academy of Sciences,Chongqing 400714,China)
出处
《钛工业进展》
CAS
2024年第1期8-14,共7页
Titanium Industry Progress
基金
中科院青促会基金项目(2018415)。
