SYMPOSIA PAPER Published: 01 January 2000
STP15265S

Multiaxial Thermo-mechanical Deformation Behavior of IN 738 LC and SC 16

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A study was undertaken to develop an understanding of the fatigue life on IN 738 LC under simple and simulated in-service operating thermomechanical cycling (TMF) in air. The experiments were conducted in the temperature ranges 450 – 950 °C, 450 – 760 °C and 600 – 850 °C. Results indicate that the lives differ with strain-temperature phasing. Diamond cycles gave the longest lives. A life prediction assessment is proposed based on the inelastic work ∑ MF σij Δεinij at Nf. It is, shown that the J2 theory is applicable to TMF loadings. Initial experiments on single crystal superalloy SC 16 prove that there is a non-uniform strain distribution in the plastic region along the circumference of [001] oriented specimens. These findings must be weighed when performing TMF tests.

Author Information

Ziebs, J
Federal Institute for Materials Research and Testing (BAM), Berlin
Meersmann, JFC
Federal Institute for Materials Research and Testing (BAM), Berlin
Kühn, HJ
Federal Institute for Materials Research and Testing (BAM), Berlin
Klinglehöffer, H
Federal Institute for Materials Research and Testing (BAM), Berlin
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Details
Developed by Committee: E08
Pages: 257–278
DOI: 10.1520/STP15265S
ISBN-EB: 978-0-8031-5423-0
ISBN-13: 978-0-8031-2853-8