scholarly journals Study on Microstructure and Mechanical Properties of Laser Welded Dissimilar Joint of P91 Steel and INCOLOY 800HT Nickel Alloy

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5876
Author(s):  
Vishwa Bhanu ◽  
Dariusz Fydrych ◽  
Ankur Gupta ◽  
Chandan Pandey
Keyword(s):  
Mechanical Properties ◽  
Impact Toughness ◽  
Laser Beam ◽  
Nickel Alloy ◽  
Heat Affected Zone ◽  
Laser Beam Welding ◽  
Dissimilar Joint ◽  
Peak Hardness ◽  
P91 Steel ◽  
Welding Technique

This investigation attempts to explore the weld characteristics of a laser welded dissimilar joint of ferritic/martensitic 9Cr-1Mo-V-Nb (P91) steel and Incoloy 800HT austenitic nickel alloy. This dissimilar joint is essential in power generating nuclear and thermal plants operating at 600–650 °C. In such critical operating conditions, it is essential for a dissimilar joint to preserve its characteristics and be free from any kind of defect. The difference between the physical properties of P91 and Incoloy 800HT makes their weldability challenging. Thus, the need for detailed characterization of this dissimilar weld arises. The present work intends to explore the usage of an unconventional welding process (i.e., laser beam welding) and its effect on the joint’s characteristics. The single-pass laser welding technique was employed to obtain maximum penetration through the keyhole mode. The welded joint morphology and mechanical properties were studied in as-welded (AW) and post-weld heat treatment (PWHT) conditions. The macro-optical examination shows the complete penetrations with no inclusion and porosities in the weld. The microstructural study was done in order to observe the precipitation and segregation of elements in dendritic and interface regions. Solidification cracks were observed in the weld fusion zone, confirming the susceptibility of Incoloy 800HT to such cracks due to a mismatch between the melting point and thermal conductivity of the base metals. Failure from base metal was observed in tensile test results of standard AW specimen with a yield stress of 265 MPa, and after PWHT, the value increased to 297 MPa. The peak hardness of 391 HV was observed in the P91 coarse grain heat-affected zone (CGHAZ), and PWHT confirmed the reduction in hardness. The impact toughness results that were obtained were inadequate, as the maximum value of impact toughness was obtained for AW P91 heat-affected zone (HAZ) 108 J and the minimum for PWHT Incoloy 800HT HAZ 45 J. Thus, difficulty in obtaining a dissimilar joint with Incoloy 800HT using the laser beam welding technique was observed due to its susceptibility to solidification cracking.

Weldability and mechanical properties of IC10 single crystal and GH3039 superalloy dissimilar laser beam welding joint

2020 ◽  
Vol 791 ◽  
pp. 139797
Author(s):  
Wenhua Dai ◽  
Sun Wenjun ◽  
Jijun Xin ◽  
Shanlin Wang ◽  
Chao Fang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Laser Beam ◽  
Single Crystal ◽  
Laser Beam Welding ◽  
Welding Joint

scholarly journals Weldability of Superalloys Hastelloy X by Yb: YAG Laser

2015 ◽  
Vol 1099 ◽  
pp. 61-70 ◽  
Author(s):  
Jeremie Graneix ◽  
Jean Denis Beguin ◽  
Joël Alexis ◽  
Talal Masri
Keyword(s):  
Mechanical Properties ◽  
Laser Beam ◽  
Laser Welding ◽  
Hastelloy X ◽  
Practical Applications ◽  
Good Oxidation Resistance ◽  
Nickel Chromium ◽  
Beam Parameters ◽  
Viable Method ◽  
Welding Technique

Hastelloy X is a commercially available nickel-chromium-molybdenum superalloy with a good oxidation resistance, a good mechanical properties at high temperature and a significant formability; sine qua criteria for the choice of materials for the production of chambers turbojet combustion which is part of this study [1]. Arc welding technique is commonly used for the manufacturing of parts but the aeronautical requirements becoming increasingly severe especially in terms of reproducibility of geometry and metallurgical grade fillet weld. Laser welding is a viable method of assembly to meet these new demands by its automation to replace longer term the manual TIG welding. The high power CO2laser is extensively used for practical applications such as cutting and welding laser welding. The CO2laser is very used in the industry with regard to Yb:YAG laser which until now was not rather powerful but this changes. The aim of this study was to evaluate the effect of Yb:YAG laser beam parameters on the microstructure and mechanical properties of the laser beam welded superalloys Hastelloy X to define a field of weldability. The implementation of an experimental design approach is required due to the multitude of input parameters and the complexity of the phenomena involved [2-3].

Simulation and Experimental Based Analysis of the Laser Beam Welding of DP Steels

2020 ◽  
Vol 1157 ◽  
pp. 73-82
Author(s):  
Raghawendra Pratap Singh Sisodia ◽  
Marcell Gáspár ◽  
Béla Fodor ◽  
László Draskóczi
Keyword(s):  
Laser Beam ◽  
Heat Affected Zone ◽  
Physical Simulation ◽  
Welded Joint ◽  
Laser Beam Welding ◽  
Base Material ◽  
Hardness Tests ◽  
Welding Thermal Cycle ◽  
Diode Laser Beam ◽  
Gleeble 3500

In this paper, heat affected zone characteristics of DP1000 steels was investigated during diode laser beam welding (LBW). A butt-welded joint of specimen in dimension of 300 x 150 mm each (according to EN15614-11:2002) with 1 mm thickness is used for the experimental purpose. The welding thermal cycle and the cooling circumstances in the HAZ was determined by real experiment and the physical simulation. A Gleeble 3500 thermo-physical simulator was used to physically simulate the coarse grain heat affected zone (CGHAZ) on the base material specimens by the utilization of the thermal cycles for t8/5 =2.5 s. The results of the physical simulation were validated by real welding experiments. The properties of the simulated and the real HAZ was examined by optical microscopic, scanning electron microscope and hardness tests.

Joining of Aluminium Structures with Aluminium Foams

1998 ◽  
Vol 521 ◽  
Author(s):  
J. Burzer ◽  
T. Bernard ◽  
H. W. Bergmann
Keyword(s):  
Mechanical Properties ◽  
Laser Beam ◽  
Tensile Test ◽  
Laser Beam Welding ◽  
Welding Parameters ◽  
Transportation Industry ◽  
Absorption Properties ◽  
Testing Method ◽  
New Construction ◽  
Joining Process

ABSTRACTThe aim of this work is the evaluation of new construction elements for applications in transportation industry which are based on new designs incorporating commonly applied aluminium structures and aluminium foams. The work includes the characterisation of the joining process, the joining mechanism and the mechanical properties of the joining zone. A testing method for the joints is developed which is based on a common tensile test in order to evaluate the influence of the main laser welding parameters on the toughness of the joints and to afford a comparison between laser beam welding and gluing process. The analysis of the joining mechanism is investigated with the help of metallographic studies. In addition, the energy absorption properties of aluminium hollows filled and joined with foam structures are characterised.

Effect of Laser Beam Welding on Microstructure and Mechanical Properties of Commercially Pure Titanium

2016 ◽  
Vol 70 (7) ◽  
pp. 1817-1825 ◽  
Author(s):  
Santosh Kumar Sahoo ◽  
Bibhudutta Bishoyi ◽  
Upendra Kumar Mohanty ◽  
Sushant Kumar Sahoo ◽  
Jambeswar Sahu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Laser Beam ◽  
Laser Beam Welding ◽  
Pure Titanium ◽  
Commercially Pure Titanium ◽  
Commercially Pure ◽  
Microstructure And Mechanical Properties

Mechanical Properties and Microstructures of Narrow Gap Orbital Welded P91 Steel

2016 ◽  
Vol 258 ◽  
pp. 635-638 ◽  
Author(s):  
Michal Junek ◽  
Marie Svobodová ◽  
Jiří Janovec ◽  
Jakub Horváth
Keyword(s):  
Mechanical Properties ◽  
Weld Metal ◽  
Base Metal ◽  
Heat Affected Zone ◽  
Room Temperature ◽  
Tensile Specimen ◽  
Narrow Gap ◽  
P91 Steel ◽  
Microstructure Evaluation ◽  
The Individual

This article deals with the results of mechanical testing and structural analysis of sections of narrow gap orbital welded P91 steel on tube OD 355.6 x 40 mm. The evaluation of mechanical properties was based on tensile test at room temperature on mini-tensile specimens and on measurement of modulus of elasticity. Weld was cut longitudinally into 9 narrow slices by using waterjet. From these slices 108 flat mini-tensile specimens (dimensions of gauge is 2 x 2 mm) were prepared. In experimental part microstructure evaluation and documentation of fracture surface of each mini-tensile specimen were carried out. The aim of these experiments was to assess the mechanical properties of the individual sections of the weld (base metal, heat affected zone and weld metal). These data can be used for new approaches of FEM modelling of welds considering heat affected zone like a combination of different materials with different mechanical properties, which connect the thermally unaffected base metal and weld metal.

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