![]() Promptly exit this page without entering the ASTM Product.Ĭompilation and as individual standards, articles and/or documents ("Documents") by ASTM If you do not agree to the terms of this License Agreement, IMPORTANT- READ THESE TERMS CAREFULLY BEFORE ENTERING THIS ASTM PRODUCT.īy purchasing a subscription and clicking through this agreement, you are entering intoĪ contract, and acknowledge that you have read this License Agreement, that you understand The LCF testing and subsequent analysis indicated that a substantial tensile stress during dwell time coupled with moderate temperatures, to allow for diffusion creep, lead to grain boundary damage that can reduce cyclic life. This was attributed to the lower stresses that developed at these temperatures for a given strain range. At higher test temperatures, the tensile dwell sensitivity for IN617 was significantly reduced or almost entirely eliminated at high temperatures (871–982☌). The failed specimens for this temperature range showed the most evidence of grain boundary cavitation and intergranular cracking. Tensile dwell life reductions were largest in tests at moderate (649–760☌) temperatures. ![]() ![]() The mechanics for the reduction in cyclic life for tensile dwell was attributed to creep damage accumulation at grain boundaries that led to widespread intergranular cracking and failure. Test results confirmed tensile dwell lives that were significantly lower than those seen in compressive dwell. Fracture surfaces of the test specimens as well as longitudinal and transverse sections were examined via scanning electron microscopy to determine the damage and failure mechanisms. Low cycle fatigue (LCF) tests were conducted from 649–982☌ with either tensile or compressive dwell. Therefore, a study was put into place to determine the effects of dwell on fatigue life and deformation mechanisms, for IN617, a solid-solution strengthened Ni-base alloy used widely in the power generation and aerospace industries. However, not much is known of the combined effects of these two mechanisms. Much has been studied on the individual effects of creep and fatigue on alloy life.
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