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07607 SCC of Ti Alloys in CT, U-bend and Constant Load Specimens

Picture for 07607 SCC of Ti Alloys in CT, U-bend and Constant Load Specimens
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Product Number: 51300-07607-SG
ISBN: 07607 2007 CP
Author: Peter L. Andresen and Gerald M. Gordon
Publication Date: 2007
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The stress corrosion crack initiation and growth rate response was evaluated on titanium Grades 7 (UNS R52400), 28 (UNS R55323) and 29 (UNS R56404) at 105 – 165 °C in several aerated, concentrated groundwater environments. Time-to-failure experiments on actively-loaded tensile specimens at 105 °C were used to evaluate the resistance to SCC, and included specimens of stainless steel and alloy 22. Long-term U-bend experiments at 165 °C were also performed. Long term crack growth rate data showed stable crack growth under constant-K (no cycling) conditions in the titanium alloys. Creep tests in < 200 °C air confirmed the literature data that these alloys are quite susceptible to creep failure, even below the yield stress. It is unclear whether cracking in the SCC tests is strongly accelerated by the creep response, or whether creep alone fully accounts for the observed cracking.
The stress corrosion crack initiation and growth rate response was evaluated on titanium Grades 7 (UNS R52400), 28 (UNS R55323) and 29 (UNS R56404) at 105 – 165 °C in several aerated, concentrated groundwater environments. Time-to-failure experiments on actively-loaded tensile specimens at 105 °C were used to evaluate the resistance to SCC, and included specimens of stainless steel and alloy 22. Long-term U-bend experiments at 165 °C were also performed. Long term crack growth rate data showed stable crack growth under constant-K (no cycling) conditions in the titanium alloys. Creep tests in < 200 °C air confirmed the literature data that these alloys are quite susceptible to creep failure, even below the yield stress. It is unclear whether cracking in the SCC tests is strongly accelerated by the creep response, or whether creep alone fully accounts for the observed cracking.
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