Steady State Creep of Ti-600 Alloy at Elevated Temperature
Creep tests were carried out on Ti-600 alloy at temperatures of 550℃ ,600℃ and 650℃ with the stresses of 150 MPa,200 MPa and 300 MPa, respectively. Steady creep rate,stress exponent n,activation energy Q at different temperatures and various stresses were calculated for the alloy. The steady-state creep rate for the alloy crept at 600℃ with the stress of 300 MPa is only 9. 17×10-8/s. The high values of the stress exponent n (2. 4-6. 9 at 600℃) and activation energy (Q=490. 1 kJ/mol) indicate the presence of the threshold stress σ0 for creep. The value of σ0 at 600℃ is calculated to be 96. 37 MPa. By incorporating the threshold stress into analysis, the creep data can be rationalized to true stress exponents p of 1. 1-4. 1 at 600 ℃, which indicate that the main creep deformation mechanism for the alloy crept at 600℃ is dislocation climb with the stress of 200-300MPa,and is characterized by dislocation glide controlled by the rate of migration of solute atom atmospheres with the stress of 150200MPa.
Ti-600 alloy stress exponent creep activation energy steady creep rate creep threshold stress.
Zeng Liying Zhao Yongqing Lu Yafeng Hong Quan
Northwest Institute for Nonferrous Metal Research ,Xi an 710016,China
国际会议
The 12th World Conference Titanium(第十二届世界钛会 Ti-2011)
北京
英文
1002-1005
2011-06-19（万方平台首次上网日期，不代表论文的发表时间）