0
Research Papers: Materials and Fabrication

An Accelerated Method for Creep Prediction From Short Term Stress Relaxation Tests

[+] Author and Article Information
J. Q. Guo, F. Li, H. C. Shi, W. Z. Meng

Laboratory of Mechanical Structural Strength,
Anyang Institute of Technology,
1 Yellow-River Avenue,
Anyang, Henan 455000, China

X. T. Zheng

Hubei Provincial Key Laboratory of Chemical
Equipment Intensification and Intrinsic Safety,
Wuhan Institute of Technology,
Wuhan 430205, China
e-mail: xiaotaozheng@163.com

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received May 11, 2015; final manuscript received November 23, 2015; published online February 5, 2016. Assoc. Editor: Marina Ruggles-Wrenn.

J. Pressure Vessel Technol 138(3), 031401 (Feb 05, 2016) (5 pages) Paper No: PVT-15-1096; doi: 10.1115/1.4032109 History: Received May 11, 2015; Revised November 23, 2015

With the development of ultrasupercritical power generation technology, creep strength of high-temperature materials should be considered for safety evaluation and engineering design. However, long-time creep testing should be conducted by traditional creep assessment methods. This paper established a high-efficient prediction method for steady creep strain rate and creep strength based on short-term relaxation tests. Equivalent stress relaxation time and equivalent stress relaxation rate were defined according to stress relaxation characteristics and the Maxwell equation. An accelerated creep prediction approach from short-term stress relaxation tests was proposed by defining the equivalent relaxation rate as the creep rate during the steady stage. Stress relaxation and creep tests using high-temperature material 1Cr10NiMoW2VNbN steel were performed to validate the proposed model. Results showed that the experimental data are in good agreement with those predicted solutions. This indicates that short-term stress relaxation tests can be used to predict long-term creep behavior conveniently and reliably, and the proposed method is suitable for creep strength design and creep life prediction of 9–12%Cr steel used in ultrasupercritical unit at 600 °C.

FIGURES IN THIS ARTICLE
<>
Copyright © 2016 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Fig. 1

Stress relaxation curve

Grahic Jump Location
Fig. 3

Stress relaxation testing specimen (mm)

Grahic Jump Location
Fig. 5

Creep curves at different stress levels

Grahic Jump Location
Fig. 2

Sketch of equivalent stress relaxation time

Grahic Jump Location
Fig. 4

Stress relaxation testing curves at different initial stresses at 600 °C

Grahic Jump Location
Fig. 6

Comparison of creep curves between the converted results (line) and experimental data (dot)

Grahic Jump Location
Fig. 7

Translated curve of equivalent relaxation rate versus stress

Grahic Jump Location
Fig. 8

Comparison of steady creep rates between the converted results and testing data

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In