The final heat treatment of large aerospace components of alloy 718 typically comprises solution treatment followed by oil quenching and aging. Such operations give rise to small, but non-uniform, plastic strains that can produce significant levels of residual stress. During oil quenching, in particular, material elements may undergo not only concurrent cooling and straining, but also reversed-plastic flow. Therefore, constitutive relations for the simulation of residual-stress evolution should include a description of such transient phenomena. To meet this need, a series of experiments involving reversed straining of short-gage-length samples of 718 was performed at temperatures between 427 and 871 °C and strain rates of 0.0001 or 0.003 s”1. These experiments revealed a measurable Bauschinger Effect (BE) over a range of temperatures. The temperature at which the BE disappeared was a function of the applied strain rate. A similar BE was also observed in experiments involving both reversed straining and continuous cooling.
CITATION STYLE
Semiatin, S. L., Fagin, P. N., Streich, B., Goetz, R. L., & Venkatesh, V. (2018). The high-temperature bauschinger effect in alloy 718. In Minerals, Metals and Materials Series (Vol. 2018-June, pp. 957–975). Springer International Publishing. https://doi.org/10.1007/978-3-319-89480-5_64
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