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Review
. 2019 Nov 27;20(1):1131-1149.
doi: 10.1080/14686996.2019.1697616. eCollection 2019.

Catalog of NIMS creep data sheets

Kota Sawada  1 , Kazuhiro Kimura  1 , Fujio Abe  1 , Yasushi Taniuchi  1 , Kaoru Sekido  1 , Takehiro Nojima  1 , Toshio Ohba  1 , Hideaki Kushima  1 , Hideko Miyazaki  1 , Hiromichi Hongo  1 , Takashi Watanabe  1
Affiliations
Review

Catalog of NIMS creep data sheets

Kota Sawada et al. Sci Technol Adv Mater. .

Abstract

The background of the NIMS Creep Data Sheet Project, together with the preliminary study and facilities, material selection, and testing method, is summarized. The outcomes from the project are explained, focusing on the long-term creep strength of ferritic and austenitic heat-resistant steels. In some cases, the slope of the stress versus time-to-rupture curve in the long term differed from that in the short term in a manner that was markedly dependent on the type of material. Heat-to-heat variations in creep strength were recognized for ferritic and austenitic steels, even when the chemical compositions of the steels examined were within the range of specifications. The reasons for the heat-to-heat variations were differences in the chemical composition, in the amounts of minor elements, and in the grain size, among others. The existence of inherent creep strength was discovered in the very long term for ferritic heat-resistant steels. The amounts of minor solute elements affect the inherent creep strength, independently of precipitation strengthening or the dislocation structure. An inflection point was observed in the tertiary creep stage for a low-alloy steel and for austenitic stainless steels when precipitation occurred during creep. A region-splitting analysis method was proposed for long-term creep strength evaluation for high-chromium ferritic steels. This method was used to review the allowable stress of high-chromium ferritic steels in Japan. A metallographic atlas, time-temperature-precipitation diagram, and fracture-mode map were proposed for ferritic and austenitic steels on the basis of creep-ruptured specimens.

Keywords: 106 Metallic materials; 303 Mechanical / Physical processing; Long-term creep strength; fracture mode; heat-resistant steels; microstructural changes.

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Figures

None
Graphical abstract
Figure 1.
Figure 1.
Overview of creep testing laboratory in Tsukuba.
Figure 2.
Figure 2.
Change of thermoelectromotive force of Type PR thermocouples after creep exposure.
Figure 3.
Figure 3.
Creep rupture strengths of JIS STBA12, JIS STBA25, and ASTM A542 steels.
Figure 4.
Figure 4.
Relationship between the reduction of area and Larson–Miller parameter for JIS STBA24, JIS SCMV4NT, and ASTM A542 steels.
Figure 5.
Figure 5.
Relationship between stress and Larson–Miller parameter for carbon steels.
Figure 6.
Figure 6.
Fitting curves for creep rupture strengths of carbon steels.
Figure 7.
Figure 7.
Relationship between estimated time to rupture at 500°C and Mo content for carbon steels.
Figure 8.
Figure 8.
Relationship between stress and time to rupture for 12Cr and 12Cr-1Mo-1W-0.3V steels. (a) 12Cr steel: RBA, RBB, RBC, RBD, RBE, RBF, RBG, RBH, RBJ (b) 12Cr-1Mo-1W-0.3V: RAA, RAB, RAC, RAD, RAE, RAF, RAG, RAH, RAJ
Figure 9.
Figure 9.
Relationship between time to rupture and effective nitrogen content for 12Cr-1Mo-1W-0.3V steels.
Figure 10.
Figure 10.
Relationship between stress and time to rupture for SUS304HTB, SUS321HTB and SUS347HTB steels.
Figure 11.
Figure 11.
Relationship between time to rupture and effective nitrogen content for SUS304HTB steel.
Figure 12.
Figure 12.
Relationship between time to rupture and grain-size number for SUS321HTB steel.
Figure 13.
Figure 13.
Relationship between time to rupture and boron content for SUS347HTB steel.
Figure 14.
Figure 14.
Relationship between stress and Larson–Miller parameter for several ferritic steels.
Figure 15.
Figure 15.
A schematic drawing for inherent creep strength.
Figure 16.
Figure 16.
Creep rate versus time curves for 1Cr-0.5Mo steel.
Figure 17.
Figure 17.
Creep rate versus time curves for Type 316L(N) steel.
Figure 18.
Figure 18.
Stress versus time to rupture curve for ASME Gr.91 steel.
Figure 19.
Figure 19.
A schematic drawing for microstructural changes during creep for ASME Gr.91 steel.
Figure 20.
Figure 20.
Optical micrographs of gauge portion of creep-ruptured specimens for SUS347HTB steel.
Figure 21.
Figure 21.
Time–temperature–precipitation diagram for SUS347HTB steel.
Figure 22.
Figure 22.
Fracture-mode map for SUS347HTB steel.
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References

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