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RESEARCH PAPERS

Prediction of Fracture Appearance Transition Temperature of 2.25Cr-1Mo Steel Used in Hot-Wall Hydrofining Reactors

[+] Author and Article Information
Jinzhu Tan1

College of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing, Jiangsu 210009, China

Wenlong Huang

College of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing, Jiangsu 210009, China

Y. J. Chao2

Department of Mechanical Engineering, University of South Carolina, Columbia, SC29208chao@sc.edu

1

Currently at the University of South Carolina, Columbia, SC 29208.

2

Author for correspondence.

J. Pressure Vessel Technol 128(4), 566-571 (Oct 24, 2005) (6 pages) doi:10.1115/1.2349569 History: Received April 10, 2005; Revised October 24, 2005

A kinetics model for temper embrittlement was employed as the basis for predicting the fracture appearance transition temperature (FATT) of 2.25Cr-1Mo steel used for hot-wall hydrofining reactors. Various heat treatments were performed to obtain different degrees of temper embrittlement for the steel. Charpy V-notch impact tests and Auger electron spectroscopy analysis were performed on embrittled 2.25Cr-1Mo steels to establish the relation between the shift of FATT and the change in the concentration of phosphorus segregated in the grain boundary of the steel. Based on the model and test data, a method of predicting the FATT at service time t was developed for the 2.25Cr-1Mo steel. Good agreement is obtained when the predicted values are compared to test data from open literature.

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Copyright © 2006 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

The constant brittleness diagram for the concentration of impurity P in the interior of the grain Cg=0.0216at.% in 2 1∕4Cr-1Mo steel

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Figure 2

Effect of variation in impurity P on the constant brittleness curve for 2 1∕4Cr-1Mo steel

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Figure 3

Percent shear fracture curve from de-embrittled reference samples

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Figure 4

Percent shear fracture for specimens of 524°C×60hr heat treatment

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Figure 5

Percent shear fracture for specimens of 496°C×90hr heat treatment

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Figure 6

Relationship between ΔFATT and ΔCgb

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Figure 7

Relationship between FATT and aging time t

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