scholarly journals Effect of Sigma Phase on Fracture Behavior of Steels and Weld Joints of Components in Power Industry Working at Supercritical Conditions

2017 ◽  
Author(s):  
Zdeněk Kuboň ◽  
Šárka Stejskalová ◽  
Ladislav Kander
Keyword(s):  
Fracture Behavior ◽  
Sigma Phase ◽  
Power Industry ◽  
Supercritical Conditions ◽  
Weld Joints

Creep fracture behavior of dissimilar weld joints between T92 martensitic and HR3C austenitic steels

2011 ◽  
Vol 88 (2-3) ◽  
pp. 94-98 ◽  
Author(s):  
Jian Cao ◽  
Yi Gong ◽  
Zhen-Guo Yang ◽  
Xiao-Ming Luo ◽  
Fu-Ming Gu ◽  
...  
Keyword(s):  
Fracture Behavior ◽  
Austenitic Steels ◽  
Creep Fracture ◽  
Dissimilar Weld ◽  
Weld Joints

Effects of Isothermal Aging on Tensile Properties and Fracture Behavior of 316L Austenitic Stainless Steel Weld Metal

2009 ◽  
Vol 83-86 ◽  
pp. 1182-1189
Author(s):  
A. Karimian ◽  
Hassan Farhangi ◽  
A. Amari Allahyari
Keyword(s):  
Stainless Steel ◽  
Weld Metal ◽  
Fracture Behavior ◽  
Sigma Phase ◽  
Steel Weld ◽  
Stainless Steel Weld ◽  
Steel Weld Metal ◽  
316L Austenitic Stainless Steel ◽  
Stainless Steel Weld Metal ◽  
Austenitic Stainless Steel Weld

In this research, variations of tensile properties and fracture behavior of 316L austenitic stainless steel weld metal as a function of aging temperature and time have been investigated. Stainless steel plates were butt-welded using GTAW process. Weld metal tensile specimens were subjected to various aging heat treatments at temperatures of 750 and 850°C for periods of 1 to 100 hours prior to tensile tests at 25 and 500°C. Dissolution of delta-ferrite and formation of sigma phase network during aging resulted in a mild increase in tensile strength and significant reduction in ductility, particularly at 25°C. Although fracture surfaces exhibited ductile features, the dimple morphology and the macroscopic fracture mode were found to be affected by aging. The unaged weld metal exhibited a classic mode of cup and cone fracture, whereas slant and flat types of fracture modes were observed in the aged weld metals, with the slant mode being dominant at 500°C. The slant mode was associated with deformation localization along arrays of primary voids, nucleated at cracked sigma phase particles, oriented at about 45° to loading direction. The transition in the fracture mode is further discussed based on variations in the dimple morphologies and strain hardening exponent.

An assessment of creep deformation and fracture behavior of 2.25Cr-1Mo similar and dissimilar weld joints

2001 ◽  
Vol 32 (1) ◽  
pp. 115-124 ◽  
Author(s):  
K. Laha ◽  
K. S. Chandravathi ◽  
K. Bhanu Sankara Rao ◽  
S. L. Mannan ◽  
D. H. Sastry
Keyword(s):  
Creep Deformation ◽  
Fracture Behavior ◽  
Dissimilar Weld ◽  
Weld Joints ◽  
Deformation And Fracture

scholarly journals Tensile Behaviour of Friction Stir Welded Joints of Different Aluminium Alloys

2021 ◽  
Author(s):  
Chaitanya Sharma ◽  
◽  
Vikas Upadhyay ◽  
Vijay Verma ◽  
Ajay Tripathi ◽  
...  
Keyword(s):  
Base Metal ◽  
Welded Joints ◽  
Aluminium Alloys ◽  
Fracture Behavior ◽  
Tensile Behaviour ◽  
Base Metals ◽  
Friction Stir ◽  
Weld Joints ◽  
First Case ◽  
Metal Hardness

This paper investigates the outcome of base metals and their temper condition on tensile and fracture behavior of friction stir welds of various work and precipitation hardening aluminium alloys in different tempers (AA1100-O, 5052-H, AA5086-O & H25, AA2024-O & T6, and AA6061-T651). The type and temper of aluminium alloys affected the tensile, and fracture behavior of weld joints. The extent of improvement in tensile properties of welded joints increased with a decrease in hardness (i.e., from T6 or H to O) of base metals. Softening was not observed for welded joints when base metal was in an annealed temper and an opposite trend was observed for hardened tempers ‘H’ and ‘T6’. Fracture location moved towards the weld centre with the change in temper from ‘O’ to ‘H’ and ‘T6’, hardness minima were closer to base metal hardness in the first case than later. The mode of fracture was ductile for all the weld joints except AA2024-T6 and AA 6061-T651. Except for AA2024-T6 and AA 6061-T651, all weld joints had ductile fracture mode.

Does the Electrical Power Industry Need Better Storm Warnings?

Space Weather ◽  
2004 ◽  
Vol 2 (3) ◽  
pp. n/a-n/a ◽  
Author(s):  
Sarah Simpson
Keyword(s):  
Electrical Power ◽  
Power Industry

Effects of bottom plate in friction stir welding of AA6061-T6

2020 ◽  
Vol 118 (1) ◽  
pp. 108
Author(s):  
M.A. Vinayagamoorthi ◽  
M. Prince ◽  
S. Balasubramanian
Keyword(s):  
Mechanical Properties ◽  
Axial Load ◽  
Weld Zone ◽  
Welding Process ◽  
Bottom Plate ◽  
Welding Parameters ◽  
Nugget Zone ◽  
Friction Stir ◽  
Weld Joints ◽  
Fine Grain

The effects of 40 mm width bottom plates on the microstructural modifications and the mechanical properties of a 6 mm thick FSW AA6061-T6 joint have been investigated. The bottom plates are placed partially at the weld zone to absorb and dissipate heat during the welding process. An axial load of 5 to 7 kN, a rotational speed of 500 rpm, and a welding speed of 50 mm/min are employed as welding parameters. The size of the nugget zone (NZ) and heat-affected zone (HAZ) in the weld joints obtained from AISI 1040 steel bottom plate is more significant than that of weld joints obtained using copper bottom plate due to lower thermal conductivity of steel. Also, the weld joints obtained using copper bottom plate have fine grain microstructure due to the dynamic recrystallization. The friction stir welded joints obtained with copper bottom plate have exhibited higher ductility of 8.9% and higher tensile strength of 172 MPa as compared to the joints obtained using a steel bottom plate.

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