Microstructures and mechanical properties of dissimilar Nd:YAG laser weldments of AISI4340 and AISI316L steels

Sufizadeh, A.R.; Mousavi, S.A.A. Akbari

doi:10.1007/s12613-017-1435-0

Cited by 6 publications

(4 citation statements)

References 17 publications

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“…According to Table 1, the maximum heat input for these samples according to Tables 1 and 5 was 190 and 192 J/mm respectively. This attribute means high heat input that leads to create welds with high width and low [20], could be attributed to the high induced heat input and, therefore, increase of Chromium content and presence of chromium rich phases in HAZ of AISI 316L side. The dimples in the SEM photomicrograph of the fractured cross section shown in Figure 8 verify the ductile fracture behavior of the sample No.…”

Section: The Effect Of Laser Parameters On Tensile Test Measurementsmentioning

confidence: 99%

Investigation of Nd:YAG pulsed laser dissimilar welding of AISI 4340 and AISI 316L stainless steels on weld geometry and mechanical properties

Sufizadeh

Mousavi

2017

Mechanics & Industry

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In this paper, laser welding of 316L and AISI 4340 steel is studied. Studies are focused on the effects of laser parameters on the depth and width of the welds. The results show that increasing in pulse energy and frequency will increase the weld depth and the weld width. The calculation of effective peak power density related to the welded joints results in optimum operating welding parameters with full penetration and proper dimensions and strengths. The tensile strength values of the full penetrated weldments are greater than the tensile strength values of AISI 316 base metal. The effects of laser parameters on weld grain size and HAZ size were investigated. The results show that the weld grain size and HAZ size increase with pulse energy and frequency.

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Section: The Effect Of Laser Parameters On Tensile Test Measurementsmentioning

confidence: 99%

Investigation of Nd:YAG pulsed laser dissimilar welding of AISI 4340 and AISI 316L stainless steels on weld geometry and mechanical properties

Sufizadeh

Mousavi

2017

Mechanics & Industry

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“…Based on the Schaeffler diagram [8], the predicted microstructures of the base metal, HAZ, and filler metal are austenite + martensite + ferrite, austenite, and austenite + ferrite, respectively. However, Sufizadeh & Mousavi's results [5] pointed out the fully austenitic microstructure in all the three regions due to the high cooling rate, which changes the solidification mode from ferrite-forming to austenite-forming. Our results corroborate no evidence of martensite or ferrite.…”

mentioning

confidence: 92%

“…Specifically in austenitic steels, a fine-grained dendritic microstructure is likely to form [2,3], and a phase transformation from austenite to martensite is favorable [4]. However, the predominant phase in the HAZ is austenite with a portion of δ ferrite, dependent on the weld material and solidification mode [5]. The solidification mode is also influenced by the chemical composition within the HAZ, particularly the bulk content of Cr and Ni.…”

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confidence: 99%

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Laser weld-induced formation of amorphous Mn–Si precipitate in 304 stainless steel

Mao

Sun

et al. 2018

Materialia

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We report the formation of partially amorphous Mn-Si precipitates due to laser welding of face centered cubic (fcc) 304 stainless steel. Transmission electron microscopy and precession electron diffraction studies in the heat affected zone (HAZ) of t he weldment indicate the formation of these precipitates in grain interiors. Precipitates have MnSi stoichiometry and the partially crystalline regions have a lattice constant of 0.45 nm. It is surmised that the rapid cooling rates during the laser weld melt pool solidification process may be sufficient to inhibit the complete crystallization of these precipitates.

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Optimization of weld bead geometry of laser welded ANSI 304 austenitic stainless steel using grey‐based Taguchi method

İrizalp

Koroglu

2020

Materialwissenschaft Werkst

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This paper investigates the quality characteristics of the welding geometry of the laser welding process for the ANSI 304 austenitic stainless steel, with the use of a pulsed Nd:YAG laser welding system. Laser welding of 2 mm thick ANSI 304 stainless steel is performed at three different levels of three factors, i. e., peak power, welding speed and pulse duration. In this study, a multi‐response optimization problem is developed to achieve weld bead geometry with full penetration as well as a narrow bead width and minimum crater. Grey relational analysis based on Taguchi orthogonal array is used to present an effective approach for the optimization of laser welding process parameters. Regression equations between the welding parameters and the bead dimensions for laser welded austenitic stainless steels are developed, which are used in predicting the penetration, width and crater. Finally, the equations are tested for values different from the levels of the parameters in the orthogonal array. It will be beneficial to engineers for continuous improvement in laser welded product quality.

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Microstructures and mechanical properties of dissimilar Nd:YAG laser weldments of AISI4340 and AISI316L steels

Cited by 6 publications

References 17 publications

Investigation of Nd:YAG pulsed laser dissimilar welding of AISI 4340 and AISI 316L stainless steels on weld geometry and mechanical properties

Investigation of Nd:YAG pulsed laser dissimilar welding of AISI 4340 and AISI 316L stainless steels on weld geometry and mechanical properties

Laser weld-induced formation of amorphous Mn–Si precipitate in 304 stainless steel

Optimization of weld bead geometry of laser welded ANSI 304 austenitic stainless steel using grey‐based Taguchi method

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