scholarly journals Study on Fracture Toughness of Heat Affected Zone of Structural Steel Member Affected by Weld Heat Input.

2001 ◽  
pp. 19-30
Author(s):  
Koji HOMMA ◽  
Chitoshi MIKI
Keyword(s):  
Fracture Toughness ◽  
Structural Steel ◽  
Heat Affected Zone ◽  
Heat Input ◽  
Weld Heat

Micromechanical Characterisation of Microstructure in Weld Heat Affected Zone of Structural Steel

2012 ◽  
Vol 525-526 ◽  
pp. 585-588 ◽  
Author(s):  
Yusuke Shimada ◽  
Yoichi Kayamori ◽  
Shohei Nishida ◽  
Mitsuhiro Matsuda ◽  
Kazuki Takashima
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Structural Steel ◽  
Mechanical Testing ◽  
Base Metal ◽  
Heat Affected Zone ◽  
Weld Heat

Microstructures in the weld heat affected zone (HAZ) can cause a decrease in fracture toughness, and evaluating the effect of microstructures on fracture toughness is helpful in understanding the cause of the fracture toughness decrease. In this study, micro-sized tensile specimens were sampled from base metal and HAZ, and the mechanical properties and fracture behaviours of different steel microstructures were directly investigated by micro-sized mechanical testing.

Improvement on Toughness of Weld Heat Affected Zone of Cu-Containing Low Alloy Steel of Long Scale Forging for Offshore Applications by Optimizing Chemical Composition

2019 ◽  
Author(s):  
Yuta Honma ◽  
Gen Sasaki ◽  
Kunihiko Hashi ◽  
Fumiyoshi Minami
Keyword(s):  
Chemical Composition ◽  
Alloy Steel ◽  
Heat Affected Zone ◽  
Heat Input ◽  
Low Alloy Steel ◽  
Crack Tip Opening Displacement ◽  
Welding Condition ◽  
Input Condition ◽  
Haz Toughness ◽  
Weld Heat

Abstract Copper-containing low alloy steel based on ASTM A707 5L grade is widely used for structural parts of offshore wells. Applications of the steel for Ultra-deepwater development require excellent low temperature toughness from the viewpoint of marine accident prevention. However it is difficult to stably obtain good weld joint toughness because the welding condition is inevitably scattering. With those backgrounds, this paper focuses on metallurgical factors controlling the HAZ toughness of A707 modified steel. Potential factors considered are the grain size, M-A and precipitates. A challenge is demonstrated to improve the HAZ toughness by optimizing the Cu and Mn contents. In this study, we investigated mechanical properties including crack tip opening displacement (CTOD) and we observed microstructure using welding tests or various weld heat cycle specimens. The weld heat affected zone (HAZ) of a conventional material had good toughness for the low heat input condition. However it was remarkably decreased for the high heat input condition due to the precipitating martensite-austenite constituent (M-A) in local brittle zones (LBZ). The weld test results indicated the importance of suppressing the formation of M-A in order to improve toughness in the HAZ of the steel. Thereby, we challenged the optimization of chemical composition for HAZ toughness improvement. Cu had no bad influence on the HAZ toughness. It was demonstrated that the HAZ toughness is recovered by good use of Cu precipitates in SC cycle. Moreover the area fraction of M-A is decreased in keeping with Mn content, which leads to the improvement of the ICCG HAZ toughness. Based on our study, the recommended amounts of Cu and Mn are more than 1.0 mass% and less than 0.6 mass%, respectively, to ensure the HAZ toughness, especially ICCG HAZ toughness.

Temper-Bead Weld Heat-Affected Zone Properties in A516-70 Steel

1987 ◽  
Vol 109 (2) ◽  
pp. 157-163 ◽  
Author(s):  
Y. J. Kim ◽  
J. W. Prince
Keyword(s):  
Fracture Toughness ◽  
Heat Affected Zone ◽  
Fracture Toughness Test ◽  
Test Results ◽  
Weld Repair ◽  
Metallographic Examination ◽  
Series Of Experiments ◽  
Hardness Values ◽  
Welding Technique ◽  
Weld Heat

A temper-bead welding technique has been developed to provide an alternative weld repair method in which the application of a high temperature post-weld heat treatment (PWHT) can be avoided. In order to assess the integrity of temper-bead weld repairs, a series of experiments were carried out on a simulated temper-bead weld made on A516-70 steel plate. Metallographic examination of the weld repair shows that the temper-bead technique can produce a grain refined heat-affected zone (HAZ) microstructure with acceptable hardness values. The JIC fracture toughness test results show that the HAZ exhibited equivalent or greater fracture toughness than the base metal.

scholarly journals Influence of Martensitic Islands on Fracture Toughness and Strength of Weld Heat-affected Zone

1993 ◽  
Vol 79 (10) ◽  
pp. 1176-1182 ◽  
Author(s):  
Tetsuya TAGAWA ◽  
Takashi MIYATA ◽  
Syuuji AIHARA ◽  
Kentarou OKAMOTO
Keyword(s):  
Fracture Toughness ◽  
Heat Affected Zone ◽  
Weld Heat

Influence of Weld Heat Input on Weld Joint between B610CF and 16MnR Steel

2010 ◽  
Vol 154-155 ◽  
pp. 421-424
Author(s):  
Tian Hui Zhang ◽  
Hong Cai Fu ◽  
Wen Min Liu ◽  
Yun Chun Cheng ◽  
Ren Ping Xu
Keyword(s):  
Impact Toughness ◽  
Weld Joint ◽  
Heat Affected Zone ◽  
Heat Input ◽  
Experimental Results ◽  
Distinct Difference ◽  
Shielded Metal Arc Welding ◽  
Metal Arc Welding ◽  
The Impact ◽  
Weld Heat

The influence of weld heat input on weld joint between B610CF and 16MnR steel using shielded metal arc welding method was investigated by metallographic experiment and mechanical properties experiment. Metallographic experimental results show that in welded metal with the increasing of weld heat input the quantity of bainite is decreased and crystalline grain is larger; but in both B610CF and 16MnR steel heat affected zone, with the increasing of weld heat input there is no distinct difference in microstructure. Mechanical property experimental results show that in weld metal with the increasing of weld heat input the impact toughness decreases, but in both B610CF and 16MnR heat affected zone, there is less difference in impact toughness; and there is no distinct difference in tensile strength and plasticity of weld joint, which is consistent with the metallographic experiment results.

Abnormal toughness characteristics and fracture model in simulated welding HAZ of 5%Ni Steel

2020 ◽  
Vol 117 (4) ◽  
pp. 410
Author(s):  
Ding Min
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Impact Toughness ◽  
Heat Affected Zone ◽  
Heat Input ◽  
Heating Time ◽  
Coarse Grained ◽  
Large Heat ◽  
Inclusion Level ◽  
Toughness Improvement

The toughness property of the coarse grained heat affected zone had become much worse since the large heat input welding was applied in HSLA for improving welding efficiency and reducing welding costs. Unlike previous investigations of the decreasing fracture toughness with heating time, the toughness of coarse grained heat affected zone increases in long heating time. Based on microstructure and mechanical properties, very remarkable impact toughness was obtained when the t8/5 was 80 s: toughness of 171 J. The toughness improvement initiates not from inclusions but directly from the microstructure of substrate. The microstructure type and inclusion level will compete to dominate the toughness of the 5% Ni steel.

Influence of Weld Parameter on Penstock Joint of B610CF-16MnR Steel

2013 ◽  
Vol 675 ◽  
pp. 270-274
Author(s):  
Yun Chun Chen ◽  
Wen Min Liu ◽  
Hou Sen Yang ◽  
Tian Hui Zhang ◽  
Pei Jun Yan
Keyword(s):  
Mechanical Property ◽  
Impact Toughness ◽  
Weld Metal ◽  
Weld Joint ◽  
Heat Affected Zone ◽  
Heat Input ◽  
Arc Welding ◽  
Experimental Results ◽  
Welding Method ◽  
Weld Heat

Weld parameter is an important factor affecting micrographic structure and mechanical properties of weld joints. It was investigated by metallographic experiments and mechanical property experiments for the influence of weld heat input on dissimilar steel weld joint of penstock using B610CF and 16MnR steel in water conservancy and hydropower engineering using shielded metal arc welding method and mixed active gas arc welding method. Metallographic experimental results show that in weld metal with the increase of weld heat input the quantity of bainite decreases and crystalline grain is larger when using the same welding method; but in both B610CF and 16MnR steel heat affected zone, there is no distinct difference in microstructure. Mechanical property experimental results show that in weld metal with the increase of weld heat input the impact toughness decreases when using the same welding method, but in both B610CF and 16MnR heat affected zone, there is less difference in impact toughness; and there is no distinct difference in tensile strength and plasticity of weld joint. So moderate weld heat input is recommended.

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