FEM-Optimized Thermomechanical Processing of Titanium Alloy Blades for Steam Turbines
Alpha-beta titanium alloys like Ti-6Al-4V and Ti-6Al2Sn-2Cr-2Mo-2Zr are today used by all major power plant producers for big steam turbine blades. The superior mechanical properties of these alloys in particular their high specific tensile and fatigue strength as well as the good corrosion resistance offer the possibility to improve the efficiency especially of the low pressure turbine. Mechanical properties of the blades are strongly dependent on their thermomechanical processing. Large differences in the cross section between root and airfoil result in different micro-structures and consequently different properties. Finite element simulation together with microstructure modeling offer the possibility to predict the mechanical properties in dependence of the forming and heat treatment processes and the position in the final blade. In this work the results of simulations will be compared with microstructure investigations on real forgings. The advantage of an accurate process design as well as the tight process control, which is possible using modern 315 and 355 MN screw presses,demonstrates that a production of big titanium blades with consistently high mechanical properties is possible.
Forging finite element simulation microstructure mechanical properties titanium blades
Martin Stockinger Werner Zechner Gerhard Krenn Gunter Weber
Bohler Schmiedetechnik GmbH & Co KG,8605 Kapfenberg,Austria
国际会议
The 12th World Conference Titanium(第十二届世界钛会 Ti-2011)
北京
英文
298-301
2011-06-19（万方平台首次上网日期，不代表论文的发表时间）