The unexpected stress-strain response of medium Mn steel after friction stir welding

Lee, Seung Joon; Park, Tak Min; Nam, Jae Hoon; Choi, Won Seok; Sun, Yingjuan; Fujii, Hidetoshi; Han, Jeongho

doi:10.1016/j.msea.2018.12.041

Cited by 26 publications

(4 citation statements)

References 45 publications

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“…In common, the corrosion morphology is reflected by the synergetic effect of both the chemical composition and microstructural characteristics. In this study, because the difference in chemical composition before and after FSW is negligible due to the relatively low processing temperature compared to fusion welding [12,[35][36][37], we focus on the effect of microstructure on the corrosion attack. Two types of corrosion attack can be categorized as follows: (a) general corrosion attack on the overall surface and (b) selective corrosion attack on a localized region.…”

Section: Discussionmentioning

confidence: 99%

Corrosion Behavior and Microstructure of Stir Zone in Fe-30Mn-3Al-3Si Twinning-Induced Plasticity Steel after Friction Stir Welding

Kim

Fujii

Lee

2020

Metals

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The effect of friction stir welding on microstructure and corrosion property was studied in Fe-30Mn-3Al-3Si (wt.%) twinning-induced plasticity steel using both an electron backscattered diffractometer and electrochemical testing (i.e., polarization test and electrochemical impedance spectroscope). The stir zone has a relatively higher corrosion resistance with uniform dissolution on the surface despite after welding, whereas the base metal shows localized corrosion attack with deep and long degradation along the grain boundaries. This is due to the corrosion-resistant coincidence site lattice boundaries caused by discontinuous dynamic recrystallization via the grain boundary bulging during the friction stir welding.

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Section: Discussionmentioning

confidence: 99%

Corrosion Behavior and Microstructure of Stir Zone in Fe-30Mn-3Al-3Si Twinning-Induced Plasticity Steel after Friction Stir Welding

Kim

Fujii

Lee

2020

Metals

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“…Comparing to the conventional FW techniques, the state-of-the-art friction stir welding (FSW) technique has been reported to be more suitable for MMS due to the relatively low welding temperature that is typically below 800 • C (i.e. the ferrite-austenite two-phase region) [38,39]. To enhance the mechanical properties of the welded MMS, a post welding heat treatment (e.g.…”

Section: Alloy Designmentioning

confidence: 99%

Recent developments and perspectives of advanced high-strength medium Mn steel: from material design to failure mechanisms

Huang

Liu

et al. 2022

Mater. Futures

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Advanced high-strength steels are key structural materials for the development of next-generation energy-efficient and environmentally friendly vehicles. Medium Mn steel, as one of the latest generation advanced high-strength steels, has attracted tremendous attentions over the past decade due to its excellent mechanical properties. Here, the state-of-the-art developments of medium Mn steel are systematically reviewed with focus on the following crucial aspects: (i) the alloy design strategies; (ii) the thermomechanical processing routes for the optimizations of microstructure and mechanical properties; (iii) the fracture mechanisms and toughening strategies; and (iv) the hydrogen embrittlement mechanisms and improvement strategies.

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“…In particular, the FW process, applicable to the rod and tube materials, generates friction heat at the welds interface so that it plasticizes a metal and forms joints in a shorter time by extrusion under rotation and axial force. 15) Therefore, this study was carried out to establish the weld parameters with defect free at higher welding speeds and to increase mechanical properties, based on the microstructures development in the weld zone (WZ). We present a significant advancement in the implementation of superior microstructures and mechanical properties for welded carbon steel tubes where we have overcome the above challenges by eco-friendly high speed FW.…”

Section: Introductionmentioning

confidence: 99%

Implementation of Exceptional Microstructures and Mechanical Properties of Structural Carbon Steel Tubes by Friction Welding

Kim¹,

Kim

Park

et al. 2022

Mater. Trans.

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In this study, friction welding was applied to carbon steel tubes at a high speed condition to achieve an eco-friendly welding process and a superior mechanical performance. Friction welding is a very efficient process for joining materials without defects, especially with joint rods or tubes. For this study, cold drawn carbon steel tubes (AISI 1020) were introduced as the base material and successfully joined by friction welding. Friction welding was performed with parameters of a burn-off length (1, 2 and 5 mm). In order to analyze the welds, the electron backscattering diffraction method was introduced and observed the grain boundary characteristic distributions such as grain size, shape and orientation. To evaluate the relationship between the mechanical properties and microstructure, Vickers microhardness and tensile tests were introduced. As a result, the yield strength of the welds significantly increased relative to the base material at all conditions, and which derived from the microstructure development like a refined acicular ferrite grains through the dynamic recrystallization during the welding. Consequently, we suggest the optimum conditions of the friction welding with the interdependence of the microstructures and mechanical properties in this study. This demonstration substantially offers the possibility of an eco-friendly environment and superior tube welding quality without any defect and harmful gases at the high speed welding process as well as at the lowest cost. This technology can be extended to mass production processes with exceptional benefits for various industries.

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The unexpected stress-strain response of medium Mn steel after friction stir welding

Cited by 26 publications

References 45 publications

Corrosion Behavior and Microstructure of Stir Zone in Fe-30Mn-3Al-3Si Twinning-Induced Plasticity Steel after Friction Stir Welding

Corrosion Behavior and Microstructure of Stir Zone in Fe-30Mn-3Al-3Si Twinning-Induced Plasticity Steel after Friction Stir Welding

Recent developments and perspectives of advanced high-strength medium Mn steel: from material design to failure mechanisms

Implementation of Exceptional Microstructures and Mechanical Properties of Structural Carbon Steel Tubes by Friction Welding

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