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

2005 ◽  
Vol 128 (4) ◽  
pp. 566-571 ◽  
Author(s):  
Jinzhu Tan ◽  
Wenlong Huang ◽  
Y. J. Chao
Keyword(s):  
Transition Temperature ◽  
Test Data ◽  
Electron Spectroscopy ◽  
Temper Embrittlement ◽  
Spectroscopy Analysis ◽  
Auger Electron Spectroscopy Analysis ◽  
Fracture Appearance Transition Temperature ◽  
Fracture Appearance ◽  
Predicted Values ◽  
Good Agreement

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.

Comparison between Charpy Transition Temperature TCVN and Reference Temperature T° for 10Ni3CrMoV Steel

2007 ◽  
Vol 539-543 ◽  
pp. 4488-4493
Author(s):  
Yi Fei Gao ◽  
Jun Chang Shen ◽  
Bo Qun Wu
Keyword(s):  
Heat Treatment ◽  
Transition Temperature ◽  
Material Design ◽  
Reference Temperature ◽  
Test Results ◽  
Test Technique ◽  
Fracture Appearance Transition Temperature ◽  
Qt Steels ◽  
Fracture Appearance ◽  
Lower Tolerance

Charpy transition temperature TCVN and reference temperature To for 10Ni3CrMoV steel were determined using two different experimental techniques such as Charpy V-notch impact test technique and reference temperature To test technique. It was found that two methods provided different test results. The median master curve with upper and lower tolerance bounds was got from the test. The upper tolerance bound is often used for material design and application. At the same time the TCVN and To results were discussed for two kinds of heat treatment which are QT(Quenching and Temper) and QLT(Quenching, anneal and temper). JC (med ) K values calculated were 101 and 105MPam1/2 for the QT and QLT steels, respectively. These indicated that the QLT steels have the higher JC (med ) K , the lower reference temperature and lower energy (or fracture appearance) transition temperature(ETT50 or FATT50) than the QT steels. This was mainly related with the different microstructures of two kinds of heat treatment.

Auger electron spectroscopy analysis of oxidation states of Te in amorphous CdTe oxide thin films

1997 ◽  
Vol 15 (5) ◽  
pp. 2537-2541 ◽  
Author(s):  
A. Zapata-Navarro ◽  
P. Bartolo-Pérez ◽  
M. Zapata-Torres ◽  
R. Castro-Rodriguez ◽  
J. L. Peña ◽  
...  
Keyword(s):  
Thin Films ◽  
Auger Electron Spectroscopy ◽  
Electron Spectroscopy ◽  
Auger Electron ◽  
Oxidation States ◽  
Oxide Thin Films ◽  
Spectroscopy Analysis ◽  
Auger Electron Spectroscopy Analysis

EVALUATION OF IMPACT PROPERTIES TO FORGED 3CR STEEL BY BARKHAUSEN NOISE

2012 ◽  
Vol 06 ◽  
pp. 385-390 ◽  
Author(s):  
UN BONG BAEK ◽  
SEOK CHEOL LEE ◽  
SEUNG HOON NAHM ◽  
YOUNG HYUN NAM
Keyword(s):  
Heat Treatment ◽  
Transition Temperature ◽  
Treatment Temperature ◽  
Noise Voltage ◽  
Barkhausen Noise ◽  
Test Results ◽  
Fracture Appearance Transition Temperature ◽  
Different Types ◽  
Fracture Appearance ◽  
Heat History

This paper reports that the Barkhausen noise method can be used to accurately characterize forged reactor vessels. The Charpy V-notch impact tests were conducted on the respective specimens with three different types of heat history. Various test results including fracture appearance transition temperature (FATT) were obtained. The Barkhausen noise voltage changed with heat treatment temperature (870~1000°C) and conditions (Tempered, PWHT). The fracture appearance transition temperature can be predicted using the Barkhausen noise voltage.

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