Fatigue Performance of an Improved Creep Strength 10%Cr Steel

Rozman, Kyle; Hawk, Jeff; Detrois, Martin; Jablonski, Paul

doi:10.1007/s11665-025-12180-8

Fatigue Performance of an Improved Creep Strength 10%Cr Steel

Journal Article · Sat Oct 18 00:00:00 EDT 2025 · Journal of Materials Engineering and Performance

DOI:https://doi.org/10.1007/s11665-025-12180-8· OSTI ID:3017394

^[1]; Hawk, Jeff ^[1]; ^[1]; ^[1]

National Energy Technology Lab. (NETL), Albany, OR (United States)

The deployment of 9-12% Cr steels for elevated temperature applications up to 650 °C presents a cost-effective alternative to more expensive nickel-based alloys in steam turbine power generation. To enhance creep resistance at this temperature range, a novel ferritic-martensitic steel, designated CPJ7, was developed and fabricated at the National Energy Technology Laboratory. The alloy design aimed to mitigate the transformation of strengthening carbides into deleterious phases that degrade creep performance. Results have demonstrated that CPJ7 exhibits favorable creep and oxidation resistance at 650 °C. However, its fatigue performance remains unexplored. This study builds upon prior research by evaluating the low cycle fatigue behavior of CPJ7 and verifying that modifications beneficial to creep performance were not detrimental to the fatigue performance. The alloy was tested at both 650 °C and ambient temperature under fully reversed bending conditions (R = − 1) and a load ratio of 0.05. Furthermore, the alloy exhibits cyclic softening, a behavior consistent with other 9-10 wt.% Cr steels. Analysis of the microstructure and hysteresis loops further corroborate cyclic softening mechanisms typical of ferritic-martensitic steels. Overall, the fatigue performance of CPJ7 meets or exceeds that of P91 steel, demonstrating its potential for high-temperature structural applications.

View Accepted Manuscript (DOE)

Research Organization:: National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy and Carbon Management (FECM)

OSTI ID:: 3017394

Journal Information:: Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 8 Vol. 35; ISSN 1544-1024; ISSN 1059-9495

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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