Effects of W and Ce micro addition in filler metal on microstructure and creep strength of Cr35Ni45NbM alloy weld joint

2021 ◽  
pp. 102600
Author(s):  
Jingfeng Guo ◽  
Xiaoming Zhang ◽  
Chunxiu Li ◽  
Wenwen Liu ◽  
Zhaogang Zhang
Keyword(s):  
Creep Strength ◽  
Weld Joint ◽  
Filler Metal ◽  
Alloy Weld

Comparison of Creep Behavior of 2.25Cr-1.6W/Mod. 9Cr-1Mo Dissimilar Weld Joint with Each Matching Filler Metal

2005 ◽  
Vol 297-300 ◽  
pp. 1452-1457
Author(s):  
Jong Jin Park ◽  
Cheol Hong Joo ◽  
Jeong Tae Kim ◽  
Hyu Sun Yu
Keyword(s):  
Creep Behavior ◽  
Creep Strength ◽  
Weld Joint ◽  
Filler Metal ◽  
Welded Joint ◽  
Creep Damage ◽  
Creep Rupture ◽  
Dissimilar Weld ◽  
Weld Joints ◽  
Carbon Migration

This paper describes the evaluation of the creep behavior with two types of matching filler metals for 2.25Cr-1.6W(T23)/Mod. 9Cr-1Mo(T91) dissimilar weld joint. Through the welding procedure qualification tests prior to the creep tests, optimum PWHT holding times at 745±5oC were determined as 30minutes for T23 matching filler metal and 60minutes for T91 matching filler metal. It was also confirmed that carbon migration across the weld interfaces and the softened area at HAZ occurred during PWHT. Creep rupture tests were carried out at 575-650oC and 70-220MPa for two dissimilar metal welds manufactured by an optimum PWHT condition. From the comparison of creep rupture strength, it was shown that the creep strength of the welded joint including T23 matching filler metal was similar to that of T23 base material and somewhat higher than that of the welded joint including T91 matching filler metal. From metallurgical study on the crept specimen, the creep damage of T23/T91 dissimilar weld joints could occur at T23 side IC HAZ and near the T23/T91 weld interface simultaneously. However, the final failure locations seemed to depend on the filler metal and the cause of this phenomenon might be regarded as the additional effect of carbon migration across the weld interfaces. It is thought that the dissimilar weld including T91 filler metal which failures at T23 side CG HAZ subject to both metallurgical notch and carbon migration become more susceptible to creep damage than that including T23 filler metal in which the carbon depletion occurs at the T23 filler metal with higher creep strength than T23 HAZ. T23 filler metal can therefore be proposed for matching filler metal of T23/T91 dissimilar weld joints

scholarly journals In-situ reactions and mechanical properties of 6061 aluminum alloy weld joint with SiCp by laser melting injection

2021 ◽  
Vol 203 ◽  
pp. 109538
Author(s):  
Boan Xu ◽  
Ping Jiang ◽  
Shaoning Geng ◽  
Yilin Wang ◽  
Jintian Zhao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Weld Joint ◽  
Laser Melting ◽  
6061 Aluminum Alloy ◽  
In Situ Reactions ◽  
Alloy Weld

Application of Gurson Model to Ni-Based Alloy Weld Joint Pipe With an Axial or a Circumferential Surface Flaw: Phase II

2013 ◽  
Author(s):  
Kiminobu Hojo ◽  
Daigo Watanabe
Keyword(s):  
Phase Ii ◽  
Weld Joint ◽  
Surface Flaw ◽  
Test Results ◽  
Fracture Test ◽  
Gurson Model ◽  
Dissimilar Metal ◽  
Fracture Behaviors ◽  
Parameter Values ◽  
Alloy Weld

The previous paper ASME PVP2012[1] reported application of Gurson model to the fracture test results using pipe models with part-through wall cracks on the dissimilar metal (DM) welds. The predicted maximum loads and the crack behaviors after penetration did not agree well. These results may originate from improper parameter values of Gurson model. This paper revised these parameters and improved the estimated fracture behaviors of the pipe models. A suitable fitting process of Gurson parameters was also proposed.

Quantitative Evaluation of Secondary Phases in a Weld Joint Made of COST F and FB2 Creep Resistant Steels

2017 ◽  
Vol 270 ◽  
pp. 183-188
Author(s):  
Dagmar Jandová
Keyword(s):  
Quantitative Evaluation ◽  
Creep Strength ◽  
Weld Joint ◽  
Precipitate Size ◽  
Secondary Phases ◽  
Creep Tests ◽  
Transmission Electron ◽  
Creep Resistant Steels ◽  
Term Creep

Conventional (CCT) and accelerated (ACT) creep tests of a weld joint made of COST F and COST FB2 steels were carried out over a temperature range from 550 °C to 650 °C. Fracturing of the crept specimens was located in the heat affected zone (HAZ) of the F steel. Two specimens were selected after CCT and ACT for quantitative evaluation of the precipitates and compared to the weld joint in as-received conditions. Scanning and transmission electron micrographs were used to measure the precipitate size. Both methods were compared and the accuracy of the results was discussed. It was concluded that ACT can simulate the precipitation of chromium carbides and structure recovery during long term creep exposures. However, precipitation of Laves phase during CCT was not recorded after ACT. Therefore, it is difficult to use ACT in this experiment for estimating the long term creep strength.

Fracture Evaluation of Ni-Based Alloy Weld Joint of Cylindrical Model Subjected to 4-Point Bending or Inner Pressure

2011 ◽  
Author(s):  
Kazuo Ogawa ◽  
Kiminobu Hojo ◽  
Itaru Muroya ◽  
Youichi Iwamoto ◽  
Naoki Ogawa
Keyword(s):  
Weld Joint ◽  
Room Temperature ◽  
Evaluation Method ◽  
Limit Load ◽  
Initial Surface ◽  
Inner Pressure ◽  
Maximum Test ◽  
Bending Load ◽  
Load Evaluation ◽  
Alloy Weld

For the purpose of establishing fracture evaluation method of nickel based alloy weld of nuclear power plants, fracture tests using pipe models (8B and 14B for bending, 12B for inner pressure) with an alloy 132 weld joint have been performed at room temperature and high temperature (325°C). The predicted loads calculated by limit load evaluation method using the measured and code regulated flow stresses were compared with the maximum test loads. And the predicted bending loads of the pipes at 325°C (8B and 14B) and at room temperature (8B) with the initial surface crack whose depth is 75% of the pipe thickness were in good agreement with the maximum test loads. Also the predicted inner pressure of the pipe at room temperature (12B) agreed with the measured maximum pressure. Only for one case of the 14B pipe subjected to the bending load at room temperature, the predicted load by limit load evaluation method has 20% unconservative difference from the measured data, on the other hand, the predicted load by J-T analysis made this difference smaller and conservative.

J0310301 Creep Strength of Dissimilar Weld Joint for A-USC Boiler

2015 ◽  
Vol 2015 (0) ◽  
pp. _J0310301--_J0310301-
Author(s):  
Masaaki TABUCHI ◽  
Hiromichi HONGO ◽  
Tetsuya MATSUNAGA ◽  
Fujio ABE
Keyword(s):  
Creep Strength ◽  
Weld Joint ◽  
Dissimilar Weld

Effects of Filler Metal on the Microstructures and Properties of 2519A/7A52 Weld Joint

2012 ◽  
Vol 602-604 ◽  
pp. 2136-2139
Author(s):  
Zhong Ju Hu ◽  
Hao Huang ◽  
Hong Gang Zhou
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloys ◽  
Grain Refinement ◽  
Weld Joint ◽  
Welded Joints ◽  
Filler Metal ◽  
Welding Wire ◽  
Brittle Phase ◽  
Strength And Ductility ◽  
Better Than

2519A/7A52 aluminum alloys were welded by using ER4043 and ER2319 welding wires with the method of MIG. The mechanical properties, microstructures as well as fracture of welded joints were studied. The results show that the welding wire of ER2319 is favorable for grain refinement of welding structures, and the strength and elongation of the joint are better than that welded by ER4043 welding wire. While for the use of ER4043, the strength and ductility of joint decline due to the generation of Si-rich brittle phase, and the fracture of weldment is mostly brittle type.

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