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.

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.

The Effects of Intercritical Heat Treatment of the SA508 Grade 3 Class 1 Steel Before Welding on the Mechanical Properties in Its Welded Joint

2002 ◽  
Author(s):  
Jeong-Tae Kim ◽  
Byung-Il Yang ◽  
Hee-Kyung Kwon
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Transition Temperature ◽  
Fracture Appearance Transition Temperature ◽  
Intercritical Heat Treatment ◽  
Class 1 ◽  
Fracture Appearance ◽  
Grade 3 ◽  
Positive Results ◽  
Better Than

In order to improve the toughness in the welded heat affected zone (HAZ) of the SA508 Grade 3 Class 1 steel, the intercritical heat treatment (IHT) has been applied before the welding. The application of the IHT before welding resulted in the decrease of fracture appearance transition temperature (FATT50) and 68Joule transition temperature (vTr68). The improved effects of the IHT on the mechanical properties of this steel have been consistently preserved in the HAZ and the effect of the IHT before welding on the transition temperatures in the HAZ of this steel was much better than those of base metal. These positive results were closely related with the newly formed sub-grains, the spheoridized carbides precipitated at sub-grain boundaries and lath boundaries which would have been acted as obstacles to the cleavage propagation.

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.

scholarly journals EFFECT OF QUENCHING AND TEMPERING PROCESS ON A MEDIUM C STEEL WITH LOW CHROMIUM AND MOLYBENUM ADDITION FOR FORGED COMPONENTS

2018 ◽  
Vol 24 (2) ◽  
pp. 112 ◽  
Author(s):  
Giusepe Napoli ◽  
Giulia Fabrizi ◽  
Riccardo Rufini ◽  
Sabrina Mengaroni ◽  
Andrea Di Schino
Keyword(s):  
Mechanical Properties ◽  
Transition Temperature ◽  
Thermal Treatment ◽  
Low Temperature ◽  
Impact Test ◽  
Fracture Appearance Transition Temperature ◽  
Fracture Appearance ◽  
Temperature Application ◽  
Mn Steel ◽  
Quenching And Tempering

<p class="AMSmaintext"><span lang="EN-GB">In this paper the effect of quenching and tempering (Q&amp;T) thermal treatment on mechanical properties of a C-Mn steel with 0.22% Cr for forged components is studied. Due to the lack od any micro-alloying elements (such as vanadium or niobium) such steel can just reach mechanical target allowed by its intrinsic hardenability. Aim of this work is to evaluate the mechanical properties dependence as a function of different quenching and tempering treatments. Results show that, after Q&amp;T, steel can reach a yield strength of 330 MPa combined with a -20°C </span><span lang="EN-GB">fracture appearance transition temperature (50% FATT) measured with a Charpy-V impact test making this steel suitable for low temperature application.</span></p>

Metallographic and Materials Evaluation of a Cracked Radial Steam Turbine Rotor

2018 ◽  
Author(s):  
Vamadevan Gowreesan ◽  
Wayne Greaves
Keyword(s):  
Steam Turbine ◽  
Manganese Sulfide ◽  
Turbine Rotor ◽  
Impact Testing ◽  
Composition Analysis ◽  
Tempered Martensite ◽  
Material Defects ◽  
Fracture Appearance Transition Temperature ◽  
Fracture Appearance ◽  
High Level

A radial steam turbine developed cracks after 220,000 hours of service. The rotor had an integral disc with eight rows of blades, and a short stub. Nine inlets on the disc channeled steam from one side to the other, and then radially outward. Analysis of the fracture surface revealed cracks originating in some of the inlet holes, and propagating by fatigue. No material defects were found at the crack initiation sites. Hardness and microstructure (optical) across the disc were uniform, but chemical composition analysis of the alloy revealed high level of phosphorus and sulfur. In addition, the microstructure consisted of uniformly tempered martensite with manganese sulfide stringers. Although tensile properties were normal, impact testing indicated embrittlement by a shift in Fracture Appearance Transition Temperature (FATT). Metallurgical evidence of embrittlement was also found. It was concluded that service induced cyclic loading in combination with reduced crack resistance caused by embrittlement lead to cracking.

Towards a more rational approach to chemical compatibility testing of clay

2002 ◽  
Vol 39 (3) ◽  
pp. 597-607 ◽  
Author(s):  
J K Kodikara ◽  
F Rahman ◽  
S L Barbour
Keyword(s):  
Boundary Condition ◽  
Hydraulic Conductivity ◽  
Rigid Wall ◽  
New Technique ◽  
Rational Approach ◽  
Lateral Strain ◽  
Test Results ◽  
Chemical Compatibility ◽  
Test Technique ◽  
Flexible Wall

Chemical compatibility tests using hydraulic conductivity testing with chemical permeants are normally undertaken to assess the integrity of compacted clayey liners used for waste containment. This paper highlights the fact that current routine methods of flexible wall and rigid wall testing techniques fail to represent the zero lateral strain boundary condition that is required to realistically represent the field situation. The test results indicate that flexible wall permeameters underestimate the likely increases in hydraulic conductivity due to chemicals, while the rigid wall permeameters can severely overestimate these effects. A new test technique, which incorporates the zero lateral strain condition in a simple manner, is presented. This technique involves the use of a rigid wall concept in a flexible wall permeameter. A split rigid mould is used to encase the soil specimen that is glued to the internal surfaces of the mould, to apply the zero lateral strain boundary condition. The new technique is shown to be suitable for both chemical compatibility and desiccation testing. The tests were undertaken with varying concentrations of saline water, methanol, and landfill leachate. The test results indicate that the new technique produces results that fall between the results obtained from flexible wall and rigid wall permeameters. It is argued that the new test technique provides a more rational approach for chemical compatibility testing than the current rigid wall and flexible wall techniques.Key words: soil, hydraulic conductivity, chemical compatibility, landfill, permeameter, boundary condition.

scholarly journals PENINGKATAN KEMAMPUAN MENULIS PARAGRAF DESKRIPTIF SISWA KELAS X SMA NEGERI 02 BENGKULU TENGAH DENGAN MENGGUNAKAN METODE MENULIS BERANTAI (ESTAFET WRITING)

2016 ◽  
Vol 2 (2) ◽  
pp. 157-163
Author(s):  
Heni Puspita
Keyword(s):  
Data Analysis ◽  
Research Data ◽  
Test Results ◽  
Test Cycle ◽  
Test Technique ◽  
Qualitative And Quantitative ◽  
Average Value ◽  
School Year ◽  
Analysis Technique ◽  
Photo Documentation

The purpose of this study for improve the students class X1 skill of SMAN 2 Central Bengkulu Tengah in write descriptive paragraph with estafet writing method. This study design is the design of classroom action research conducted in two cycles, the first cycle and the second cycle. Collecting data on the first cycle and the second cycle using test technique and nontest. The test used is a test action in the form of assignment to write a description, whereas nontest techniques used in the form of guidelines for observation, the journal guidelines, interview guides, and photo documentation guidelines. Data analysis technique of this research is qualitative and quantitative. Quantitative techniques are used to analyze and compare test results pre-cycle, the first cycle, the second cycle, and qualitative techniques used to analyze and compare the results nontest in the first cycle and the second cycle. Based on the analysis of research data, in class X1 totaling 30 students can be concluded that by using the estafet writing method can increase the skill of writing a paragraph descriptive. In the first cycle, the value of an average of 71.65% in the second cycle, the average value of 88.73%, an increase of 17.08%. This means that there is an increase in the skill of writing a paragraph descriptive of the students with estafet writing method. This increase can be seen from the results of tests conducted students in class X SMAN 2 Central Bengkulu 2016/2017 school year that includes the end of the test cycle test cycle I and II.  

Effect of Reheating and Deformation Processes on DWTT Performance for Heavy Gauge Pipeline Steel

2018 ◽  
Vol 921 ◽  
pp. 149-156
Author(s):  
Chuan Guo Zhang ◽  
Qi Jie Zhai ◽  
Lei Zheng
Keyword(s):  
Steel Plate ◽  
Pipeline Steel ◽  
Reduction Ratio ◽  
Toughening Mechanism ◽  
Soaking Time ◽  
Single Pass ◽  
Fracture Appearance Transition Temperature ◽  
Fracture Appearance ◽  
Deformation Processes ◽  
Welded Pipe

DWTT (Drop weigh tear test) is an effective way to evaluate the fracture propagation for pipeline steel. The effects of slab reheating temperature, soaking time, single pass reduction ratio during recrystallization zone rolling and transfer bar ratio during non-recrystallization zone rolling on DWTT performance were studied for heavy gauge pipeline steel. And the grain refinement and toughening mechanism were discussed. It was found that the grain in the core of the plate can be refined by reducing the reheating temperature, increasing the single pass reduction ratio during recrystallization zone rolling and setting suitable transfer bar ratio during non-recrystallization zone rolling, which promote the DWTT property improvement for heavy gauge pipeline steel. The 30.9mm heavy gauge pipeline steel plate was industrial produced and the X70 UOE welded pipe with dimension in Φ1219×30.9mm was manufactured. The DWTT 85%FATT (fracture appearance transition temperature) of pipe body is as low as -20°C.

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