Abstract
Microtexture has been linked to large reductions in cold dwell fatigue (CDF) life of specific dual phase titanium alloy aeroengine components. A recently completed Metals Affordability Initiative (MAI) funded program led by Pratt & Whitney (P&W) and includes ATI Forged Products, Boeing, GE Aviation, Rolls Royce (RR), Arconic, Titanium Metals Corporation (TIMET), PCC-Wyman Gordon (PCC-WG), Scientific Forming Technologies (SFTC), Materials Resources LLC (MRL) and The Ohio State University (OSU) has developed improved techniques for the characterization of microtexured regions (MTR) in titanium billet and forgings, and integrated computational materials engineering (ICME). These methods are aimed at developing and integrating process and property modeling tools for the prediction of microtexture and fatigue life in titanium components. These characterization and fatigue life prediction tools have near-term application off ramps that will enable use for process and product development and quality control. Key results for two widely used alloys, Ti-6242 and Ti-64, will be reviewed in this paper.
Highlights
The a+b class of tanium alloys are widely used in the fan and compressor stages of jet engines, due to their excellent strength to weight ra o and corrosion resistance
The current study was aimed at evalua ng the dwell fa gue sensi vity in a+b alloys such as Ti-6-4 and developing and valida ng an open method for classifying and quan fying microtextured regions (MTR’s) that can be u lized across the supply chain for the safe design and manufacture of tanium components
Materials Resources LLC (MRL)’s methods were described in detail at the 13th Ti-World conference in San Diego [7].The second T&M u lized the open source so ware, Dream3D, with program developed pipelines to import and clean Electron backscatter diffraction (EBSD) data, segment features based on pixel misorienta on, and store the data in an efficient HDF5 format
Summary
The a+b class of tanium alloys are widely used in the fan and compressor stages of jet engines, due to their excellent strength to weight ra o and corrosion resistance. Venkatramini, Ghosh and Mills later validated this proposal using a mul -scale computa onal finite element approach that iden fied a local phenomenon of load shedding, due to so grains shedding load on to hard grains, with a significant rise in stress gradients across the interface [5]. Such stress redistribu on between microtextural regions with different crystal orienta ons has been proposed as the fundamental cause of the development of cracks during dwell fa gue in near a tanium alloys. The current study was aimed at evalua ng the dwell fa gue sensi vity in a+b alloys such as Ti-6-4 and developing and valida ng an open method for classifying and quan fying microtextured regions (MTR’s) that can be u lized across the supply chain for the safe design and manufacture of tanium components
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