scholarly journals Incorporation of TiC Particulates on AISI 4340 Low Alloy Steel Surfaces via Tungsten Inert Gas Arc Melting

2012 ◽  
Vol 445 ◽  
pp. 655-660 ◽  
Author(s):  
S. Mridha ◽  
A.N.Md Idriss ◽  
T.N. Baker
Keyword(s):  
Alloy Steel ◽  
Energy Input ◽  
High Energy ◽  
Inert Gas ◽  
Low Alloy Steel ◽  
Steel Surfaces ◽  
Tic Particulates ◽  
Powder Content ◽  
Hardness Values ◽  
Aisi 4340

Surface cladding utilizes a high energy input to deposit a layer on substrate surfaces providing protection against wear and corrosion. In this work, TiC particulates were incorporated by meltingsingle tracksin powder preplaced onto AISI 4340 low alloy steel surfaces using a Tungsten Inert Gas (TIG) torch with a range of processing conditions. The effects of energy input and powder content on the melt geometry, microstructure and hardness were investigated. The highest energy input (1680 J/mm) under theTIG torchproduced deeper (1.0 mm) and wider melt pools, associated with increased dilution, compared to that processed at the lowest energy (1008 J/mm). The melt microstructure contained partially meltedTiC particulatesassociated with dendritic, cubic and globular typecarbidesprecipitated upon solidification of TiC dissolved in the melt; TiC accumulated more near to the melt-matrix interface and at the track edges. Addition of 0.4, 0.5 and 1.0 mg/mm2TiC gave hardness values in the resolidified melt pools between 750 to over 1100Hv, against a base hardness of 300 Hv; hardness values are higher in tracks processed with a greater TiC addition and reduced energy input.

Effect of Thermocyclic Treatment with Different Cooling Rates on the Mechanical Characteristics of 42CD4 Low-Alloy Steel

2019 ◽  
Vol 397 ◽  
pp. 169-178
Author(s):  
Fethia Bouaksa ◽  
Mamoun Fellah ◽  
Naouel Hezil ◽  
Ridha Djellabi ◽  
Mohamed Zine Touhami ◽  
...  
Keyword(s):  
Cooling Rate ◽  
Alloy Steel ◽  
Mechanical Characteristics ◽  
Steel Sample ◽  
Low Alloy Steel ◽  
Cooling Rates ◽  
Microstructure Characteristics ◽  
Thermocyclic Treatment ◽  
Hardness Values

The aim of this study was to investigate the influence of thermo-cyclic treatments on the mechanical characteristics (Hardness and Resilience) of low-alloy 42CD4 steel. Thermocyclic treatment on 42CD4 steel was operated for four cycles at 850 °C for 30 min. After each cycle, the steel sample was cooled in different medium (open air and water) in order to check the effect of the cooling rate on the microstructure characteristics. It was found that the cooling rate can affect the mechanical characteristics of the steel. The hardness values of steel cooled in water were higher than those of steel cooled in air. Additionally, there was an increase in the resilience of steel sample with the increase of thermocyclic number.

Microstructure of TIG Melted Composite Coating on Steel Produced Using 1.0 and 1.5 mg/mm2 TiC at an Energy Input of 2640 J/mm

2012 ◽  
Vol 576 ◽  
pp. 467-470 ◽  
Author(s):  
A.N. M. Idriss ◽  
S. Mridha
Keyword(s):  
Energy Input ◽  
Single Track ◽  
Remarkable Change ◽  
Composite Layers ◽  
Welding Torch ◽  
Wear And Corrosion ◽  
Nominal Size ◽  
Flower Type ◽  
Steel Surfaces ◽  
Tic Particulates

Surface modification by reinforcing ceramic particulates can give protection against wear and corrosion of metal. In this work, two different amounts of TiC powder of nominal size 45 to 100 µm were embedded on AISI 4340 steel surfaces by melting under a Tungsten Inert Gas (TIG) welding torch with an energy input of 2640 J/mm. The microstructure, geometry and hardness of the single track composite layers were investigated. The resolidified melt tracks were hemispherical in shape. With increasing TiC content, the melt dimensions reduced a little but the microstructure had a remarkable change. The track with 1.5 mg/mm2 TiC gave more un-melted TiC, partially melted TiC and agglomeration of ceramic particulates while the 1.0 mg/mm2 track dissolved most TiC particulates and precipitated carbides in the form of dendrite, globular and flower type particles; dendrites are almost absent in the 1.5 mg/mm2 track. A reduced TiC addition created more fluid melt which accelerated dissolution of TiC and that caused more carbide precipitation in the 1.0 mg/mm2 track compared to that with 1.5 mg/mm2 track. The 1.0 mg/mm2 track produced lower hardness of 1065 Hv compared to 1350 Hv for the 1.5 mg/mm2 track.

Dissimilar Welding Simulation of 316L and Low Alloy Steel Using the SYSWELD Simulation

2015 ◽  
Vol 1101 ◽  
pp. 438-441
Author(s):  
Ying Cheng Liu ◽  
Ta Chien Cheng ◽  
Chieh Yu ◽  
Ren Kae Shiue
Keyword(s):  
Alloy Steel ◽  
Process Simulation ◽  
316L Stainless Steel ◽  
Welding Process ◽  
Inert Gas ◽  
Dissimilar Welding ◽  
Low Alloy Steel ◽  
Stainless Steel 316L ◽  
Simulation Results ◽  
Stress And Deformation

The purpose of this investigation is focused on the welding process simulation using the SYSWELD software. It has been used to conduct the simulation of the tungsten inert gas (TIG) welding process. 316L stainless steel (316L SS) is welded with a low alloy steel (A508) using the Inconel filler 82 (IN-82). Welding experiments are carried out in order to compare with simulation results. Profile of the welding pool, residual thermal stress and deformation of the weld have been studied, and accuracy of the simulated results is also evaluated.

A Perspective on the Failure Rates of Long Seam-Welded Low Alloy Steel High Energy Piping

2011 ◽  
Author(s):  
Jude Foulds ◽  
John Shingledecker
Keyword(s):  
Alloy Steel ◽  
Power Plants ◽  
Operating Time ◽  
Stress Rupture ◽  
High Energy ◽  
Weld Strength ◽  
Failure Rates ◽  
Low Alloy Steel ◽  
Design Rules ◽  
Damage And Failure

For over three decades, the long seam-welded low alloy steel, Grades 11 and 22, high energy piping in fossil power plants has been considered at risk of premature damage and failure. The experience with piping damage and failures has been documented and extensively studied, but there remains a lack of perspective on how the overall experience with such piping, including that of the large “survivor” population, compares with what one may expect with the design rules used in their construction. Such a perspective can be useful in helping decide on suitable design rules for this class of piping. This paper focuses on an aggregate, global, semi-quantitative evaluation of the damage and failure experience in fossil plant low alloy steel long seam-welded piping in terms of a rate of failure measured against the performance of the overall population. A key aspect of the evaluation is the consideration of the survivor population, particularly important since the documented cases of failure and damage represent a very small fraction of the population of relevant components. The damage and failure rates have been derived from the Electric Power Research Institute database, using an exposure parameter represented by the product of operating time and length of piping. The rates are viewed against the backdrop of the statistical scatter band of base metal stress rupture data used in development of the ASME Code design allowable stresses and against the weld strength reduction factors recently adopted by the ASME Boiler Pressure Vessel Code, Section I and the Power Piping Code, B31.1.

Hard turning: AISI 4340 high strength low alloy steel and AISI D2 cold work tool steel

2005 ◽  
Vol 169 (3) ◽  
pp. 388-395 ◽  
Author(s):  
J.G. Lima ◽  
R.F. Ávila ◽  
A.M. Abrão ◽  
M. Faustino ◽  
J. Paulo Davim
Keyword(s):  
Alloy Steel ◽  
Tool Steel ◽  
Hard Turning ◽  
Cold Work ◽  
High Strength ◽  
Low Alloy Steel ◽  
Aisi D2 ◽  
Cold Work Tool Steel ◽  
Aisi 4340
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