The effect of post-weld heat treatments on the microstructure and mechanical properties of maraging steel laser weldments

Reddy, G. Madhusudhan; Rao, V. Venkateswara; Raju, A. V. Sita Rama

doi:10.1243/14644207jmda258

Cited by 12 publications

(15 citation statements)

References 5 publications

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“…During the welding an austenitic structure is formed within the heat affected zone. This region does not change the structure during the artificial ageing [11]. Since at additive manufacturing many of these heat affected zones are put to each other, the total strength of the additive manufactured part after hardening is reduced.…”

Section: Matec Web Of Conferencesmentioning

confidence: 96%

Qualification of laser based additive production for manufacturing of forging Tools

Junker¹,

Hentschel²,

Schmidt³

et al. 2015

MATEC Web of Conferences

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Abstract. Mass customization leads to very short product life cycles, so the costs of a tool have to be amortized with a low number of workpieces. Especially for highly loaded tools, like those for forging, that leads to expensive products. Therefore more economical production processes for tool manufacturing have to be investigated. As laser additive manufacturing is already used for the production of moulds for injection moulding, this technology maybe could also improve the forging tool production. Within this paper laser metal deposition, which is industrially used for tool repair, will be investigated for the use in tool manufacturing. Therefore a mechanical characterization of parts built with different laser process parameters out of the hot work tool steel 1.2709 is made by upsetting tests and hardness measurements. So the influence of the additive manufacturing process on the hardness distribution is analysed.

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Section: Matec Web Of Conferencesmentioning

confidence: 96%

Qualification of laser based additive production for manufacturing of forging Tools

Junker¹,

Hentschel²,

Schmidt³

et al. 2015

MATEC Web of Conferences

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show abstract

“…Compressive residual stress has an advantageous effect; it helps to suppress stress corrosion cracking, and increase fatigue life. [6][7][8][9][10] The predominant problem of welded structure in shipbuilding application is toughness at subzero temperature (-60 C). The heating and cooling cycles in multi-pass welding cause differences in microstructure between cap, centre and root of fusion zone.…”

Section: Introductionmentioning

confidence: 99%

Effect of inclusions on microstructure and mechanical behavior of multi-pass welded naval grade steel

Kannan

Arivazhagan

Rao

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part L:

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This paper assesses the metallurgical characteristics and mechanical properties of multi-pass gas tungsten arc welding (GTAW) and gas metal arc welding (GMAW) of micro-alloyed steel DMR 249-A. The prime objective was to carry out a comparative study of the microstructure and mechanical properties of the joints produced by the two types of welding. A high volume of larger sized inclusions in GMAW contributed to inferior mechanical properties. The coarse-grained part of the heat-affected zone (CGHAZ) showed a lower microhardness. Fracture always occurred in the heat-affected zone, and it is believed that it is associated with CGHAZ. GTAW joints showed low tensile residual stress, higher hardness, and tensile strength. GTA weldment also showed superior impact toughness at sub-zero temperature (–60 °C). Mn-containing inclusions were seen in GTA weldments; it is believed that they promote the formation of acicular ferrite. This is believed to be responsible for the superior mechanical properties of GTA weldments. The microstructural analysis of the two weldments revealed the presence of a higher volume fraction of acicular ferrite in the GTAW. All in all, GTAW joint was found to perform better than GMAW joint.

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“…Due to the involvement of large process variables in welding operations, it is quite difficult to obtain the ideal welding system, which fulfills all the requirements and produces the stronger joint. 3–5 As per the definition of Babu et al., 6 “there is still requirement of improvements in welding systems, even after 100 years of arc welding invention”. Hence, in view of the above problems associated with the welding, the first commercially successful welding process, i.e.…”

Section: Introductionmentioning

confidence: 99%

Investigating the effect of electrode preheating in novel water-cooled advanced submerged arc welding process

Choudhary

Gupta

Kumar

2018

Proceedings of the IMechE

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In this paper, a novel developed water-cooled advanced submerged arc welding (WASAW) process has been designed and established. The developed WASAW process can be utilized for higher preheating currents at 100% duty cycle. Subsequently, a multi-pass welding investigation has been carried out on AISI 1023 steel plates as per the L8 Taguchi orthogonal array by varying WASAW input factors namely voltage (V), wire feed rate (WFR), welding speed (WS), nozzle to plate distance (NPD), and preheat current (I), respectively. The relationships between selected WASAW process parameters and responses namely tensile strength (TS), yield strength (YS), percentage elongation (E), and weld metal hardness (H) has been established with statistical regression analysis and ANOVA method. Then, the effect of each input factor and their interactions on selected responses was analyzed using single effect and 3D surface plots. Lately, the fractography analysis of tensile fractured surfaces has been carried out to study the failure in all weld metals. Finally, Jaya and genetic algorithms have been applied to optimize the WASAW performance. Overall, the outcomes reveal that developed WASAW process yields a substantial enhancement in the mechanical behavior of all weld metals.

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The effect of post-weld heat treatments on the microstructure and mechanical properties of maraging steel laser weldments

Cited by 12 publications

References 5 publications

Qualification of laser based additive production for manufacturing of forging Tools

Qualification of laser based additive production for manufacturing of forging Tools

Effect of inclusions on microstructure and mechanical behavior of multi-pass welded naval grade steel

Investigating the effect of electrode preheating in novel water-cooled advanced submerged arc welding process

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