Effect of heat input on the microstructure and mechanical properties of the low alloy quench and tempered steel welded joint (AISI 4340)

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Mirak Alireza; Rezaimanesh Morteza; Gaeeni Meysam

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Paper Information

Journal: METALLURGICAL ENGINEERING Year:2019 | Volume:22 | Issue:3 (75) Page(s): 225-238

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Information Journal Paper

Title

Effect of heat input on the microstructure and mechanical properties of the low alloy quench and tempered steel welded joint (AISI 4340)

Author(s)

Mirak Alireza | Rezaimanesh Morteza | Gaeeni Meysam | Issue Writer Certificate

Keywords

4340 steel sheetQ1

GTAW weldingQ2

heat inputQ2

microstructureQ2

mechanical propertiesQ2

Abstract

This research deals with the effect of heat input on microstructure and mechanical properties of a sheet welded joints made of low alloy quenched and tempered steel (AISI 4340). Samples were prepared by manual gas tungsten arc welding (GTAW) with the low carbon consumable and also pre and post-weld heat treatment has been applied. Macro etch analysis showed that as the heat input increases, the HAZ area widespread. Indeed, the primary austenite grain phase grows up. The microstructure of HAZ consists of bainite and different ferrite morphology. The martensite and ferrite can be seen in the weld section. The volume fraction of ferrite increases as heat input increases. Furthermore, the ferrite morphology changes to acicular ferrite due to reduced cooling rate in the weld. Tensile strength decreases from 1078 Mpa to 970 Mpa correlatively coarsening in the heat-affected zone. Impact energy results vary with heat input correspondingly, the toughness increases in the weld and was reduced in HAZ. However, for conclusion, improved mechanical properties of the weld joints were achieved using low heat input and low carbon consumable.

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APA: Copy

Mirak, Alireza, Rezaimanesh, Morteza, & Gaeeni, Meysam. (2019). Effect of heat input on the microstructure and mechanical properties of the low alloy quench and tempered steel welded joint (AISI 4340). METALLURGICAL ENGINEERING, 22(3 (75) ), 225-238. SID. https://sid.ir/paper/405738/en

Vancouver: Copy

Mirak Alireza, Rezaimanesh Morteza, Gaeeni Meysam. Effect of heat input on the microstructure and mechanical properties of the low alloy quench and tempered steel welded joint (AISI 4340). METALLURGICAL ENGINEERING[Internet]. 2019;22(3 (75) ):225-238. Available from: https://sid.ir/paper/405738/en

IEEE: Copy

Alireza Mirak, Morteza Rezaimanesh, and Meysam Gaeeni, “Effect of heat input on the microstructure and mechanical properties of the low alloy quench and tempered steel welded joint (AISI 4340),” METALLURGICAL ENGINEERING, vol. 22, no. 3 (75) , pp. 225–238, 2019, [Online]. Available: https://sid.ir/paper/405738/en

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