Galvanic corrosion behavior of Ti-1023 titanium alloy coupled 30CrMnSiA steel was investigated in 3.5% NaCl solution. Particular attention was given to the effect of three different electroplated coatings on corrosion...Galvanic corrosion behavior of Ti-1023 titanium alloy coupled 30CrMnSiA steel was investigated in 3.5% NaCl solution. Particular attention was given to the effect of three different electroplated coatings on corrosion behavior of the galvanic couple. Galvanic corrosion test was conducted on Ti-1023 titanium alloy which coupled Ni-electroplated 30CrMnSiA, Zn-electroplated 30CrMnSiA, Cd-electroplated 30CrMnSiA and bare 30CrMnSiA, respectively. Corrosion properties including open circuit potential （Eoc）, galvanic corrosion potential （Eg）, and galvanic corrosion current （lg） were monitored. Corrosion morphology was observed by optical microscope （OM） and corrosion mechanism was analyzed and discussed. The results show that the three electroplated coatings improve the corrosion resistance of the anode in different magnitudes. Ni-electroplated 30CrMnSiA and Cd-electroplated 30CrMnSiA coatings are found to be least susceptible to galvanic corrosion when coupled Ti-1023 titanium alloy. Zn-electroplated 30CrMnSiA is moderately susceptible to galvanic corrosion. But the bare 30CrMnSiA is highly susceptible to galvanic corrosion in corrosive environment.展开更多
通过两种方案试制Φ350 mm Ti-1023合金棒材,分析了两种方案生产的棒材横、纵向组织、力学性能和探伤结果的差异。结果表明:铸锭开坯及中间锻造采用一次"高低高",成品锻造相变温度以下35～50℃进行,变形量大于60%的锻造工艺,...通过两种方案试制Φ350 mm Ti-1023合金棒材,分析了两种方案生产的棒材横、纵向组织、力学性能和探伤结果的差异。结果表明:铸锭开坯及中间锻造采用一次"高低高",成品锻造相变温度以下35～50℃进行,变形量大于60%的锻造工艺,可生产出满足X/BS5116标准性能要求的棒材,且棒材的组织均匀性好。展开更多
Formability of direct laser deposited Ti-1023 alloys was revealed through investigating the pore defects,microstructure and tensile properties.The results show that gas pores and local non-fusion are two typical defec...Formability of direct laser deposited Ti-1023 alloys was revealed through investigating the pore defects,microstructure and tensile properties.The results show that gas pores and local non-fusion are two typical defects in the Ti-1023 alloy deposits.Gas pores are spherical and exist randomly in the deposited layers.Non-fusion defects present irregular and lie in adjacent layer-layer and pass-pass boundaries.The layer boundary effects are gradually weakening from the bottom to the top of the single pass deposits.The microstructure of the single pass deposits and multiple pass built block consists of equiaxed grains.Moreover,the tensile properties of as-deposited Ti-1023 alloys are equal to the as-forged tensile corresponding values.Through optimizing the laser rapid forming parameters,the non-fusion defects can be eliminated and the dense Ti-1023 parts are obtained.展开更多
The deformation behavior and mechanisms of Ti-1023 alloy were studied in the temperature range of 650-900 ℃ and strain rate range of 0.001-10 s-1 by compression and tensile tests. The results show that in a limited s...The deformation behavior and mechanisms of Ti-1023 alloy were studied in the temperature range of 650-900 ℃ and strain rate range of 0.001-10 s-1 by compression and tensile tests. The results show that in a limited strain rate range of 0.001-0.1 s-1, the kinetic rate equation is obeyed and a linear fit is obtained at all the temperatures. The apparent activation energy is 322 kJ/mol in the α-β region and 160 kJ/mol in the β region, respectively. Power dissipation maps of this alloy developed by using Gleeble test data show three domains in the tested range. Superplasticity, marked by abnormal elongation at 700 ℃, occurs in the temperature range of 650-750 ℃ and at strain rates below about 0.03 s-1. Large grain superplasticity takes place in the temperature range of 750-850 ℃ and strain rates range of 0.001-0.03 s-1. Dynamic recrystallization occurs in the temperature range of 850-900 ℃ and at strain rates below about 1 s-1. The instability maps of this alloy were also developed.展开更多
基金the National Science Foundation of China (No.50571003)
文摘Galvanic corrosion behavior of Ti-1023 titanium alloy coupled 30CrMnSiA steel was investigated in 3.5% NaCl solution. Particular attention was given to the effect of three different electroplated coatings on corrosion behavior of the galvanic couple. Galvanic corrosion test was conducted on Ti-1023 titanium alloy which coupled Ni-electroplated 30CrMnSiA, Zn-electroplated 30CrMnSiA, Cd-electroplated 30CrMnSiA and bare 30CrMnSiA, respectively. Corrosion properties including open circuit potential （Eoc）, galvanic corrosion potential （Eg）, and galvanic corrosion current （lg） were monitored. Corrosion morphology was observed by optical microscope （OM） and corrosion mechanism was analyzed and discussed. The results show that the three electroplated coatings improve the corrosion resistance of the anode in different magnitudes. Ni-electroplated 30CrMnSiA and Cd-electroplated 30CrMnSiA coatings are found to be least susceptible to galvanic corrosion when coupled Ti-1023 titanium alloy. Zn-electroplated 30CrMnSiA is moderately susceptible to galvanic corrosion. But the bare 30CrMnSiA is highly susceptible to galvanic corrosion in corrosive environment.
文摘通过两种方案试制Φ350 mm Ti-1023合金棒材,分析了两种方案生产的棒材横、纵向组织、力学性能和探伤结果的差异。结果表明:铸锭开坯及中间锻造采用一次"高低高",成品锻造相变温度以下35～50℃进行,变形量大于60%的锻造工艺,可生产出满足X/BS5116标准性能要求的棒材,且棒材的组织均匀性好。
文摘Formability of direct laser deposited Ti-1023 alloys was revealed through investigating the pore defects,microstructure and tensile properties.The results show that gas pores and local non-fusion are two typical defects in the Ti-1023 alloy deposits.Gas pores are spherical and exist randomly in the deposited layers.Non-fusion defects present irregular and lie in adjacent layer-layer and pass-pass boundaries.The layer boundary effects are gradually weakening from the bottom to the top of the single pass deposits.The microstructure of the single pass deposits and multiple pass built block consists of equiaxed grains.Moreover,the tensile properties of as-deposited Ti-1023 alloys are equal to the as-forged tensile corresponding values.Through optimizing the laser rapid forming parameters,the non-fusion defects can be eliminated and the dense Ti-1023 parts are obtained.
文摘The deformation behavior and mechanisms of Ti-1023 alloy were studied in the temperature range of 650-900 ℃ and strain rate range of 0.001-10 s-1 by compression and tensile tests. The results show that in a limited strain rate range of 0.001-0.1 s-1, the kinetic rate equation is obeyed and a linear fit is obtained at all the temperatures. The apparent activation energy is 322 kJ/mol in the α-β region and 160 kJ/mol in the β region, respectively. Power dissipation maps of this alloy developed by using Gleeble test data show three domains in the tested range. Superplasticity, marked by abnormal elongation at 700 ℃, occurs in the temperature range of 650-750 ℃ and at strain rates below about 0.03 s-1. Large grain superplasticity takes place in the temperature range of 750-850 ℃ and strain rates range of 0.001-0.03 s-1. Dynamic recrystallization occurs in the temperature range of 850-900 ℃ and at strain rates below about 1 s-1. The instability maps of this alloy were also developed.
