Characteristics of Microstructure in Ultrahigh Carbon Steel Produced during Friction Stir Welding

Sato, Yutaka; Yamanoi, Hideaki; Kokawa, Hiroyuki

doi:10.2355/isijinternational.48.71

Cited by 26 publications

(10 citation statements)

References 27 publications

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“…[6][7][8][9][10][11][12][13][14][15][16] This process creates the lap weld by plunging and retracting of the welding tool, which does not accompany the travel of the tool. Compared with RSW, FSSW can reduce the thermal effect to the welded material due to the solid-state process.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Evolution of DP980 Steel during Friction Bit Joining

Huang

Sato

Kokawa

et al. 2009

Metall Mater Trans A

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The authors study a new solid-state spot joining process, friction bit joining (FBJ), which relies on the use of a consumable joining bit. It has been reported that FBJ is feasible for the joining of steel/steel and aluminum/steel, but the metallurgical characteristics of the joint for enhancement of the properties and reliability remain unclear. Therefore, this study produced friction bit joints in DP980 steel and then examined the microstructures in the joint precisely. In this article, the microstructure distribution associated with hardness in the friction-bit-joined DP980 steel and the microstructural evolution during FBJ are reported.

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Section: Introductionmentioning

confidence: 99%

Microstructural Evolution of DP980 Steel during Friction Bit Joining

Huang

Sato

Kokawa

et al. 2009

Metall Mater Trans A

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“…2.2.1 페라이트계 강 페라이트계 강에 대한 FSW 보고는 지금 까지 연강 8) , 각종 탄소강 [9][10][11][12][13][14] , DH36강 15) , C-Mn강 16,17) , 라인 파이 프용강 18,19) , 12%Cr강 20,21) , HSLA-65강 [22][23][24][25][26] , DP강 [27][28][29][30] , B첨가강 . 그러나 접합조건을 조절하여 냉 각속도 및 최고도달온도를 제어하면 FSW후 경화조직 의 형성을 억제할 수 있다 [10][11] .…”

Section: 철강재 Fsw접합부 특성unclassified

The Status of Friction Stir Welding Applications to Ferrous Materials

Lee¹

2009

Journal of the Korean Welding and Joining Society

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“…Several tool materials have been used for FSW and FSSW of AHSS, including silicon nitride (SiN), polycrystalline cubic boron nitride (PCBN), tungsten rhenium (W-Re), tungsten carbide (WC), and other tungsten-based alloys. 3,[11][12][13][14][15][16][17][18][19] The tooling material used in the present study was Si 3 N 4 , which is less resistant to wear than a material like PCBN, but is also very inexpensive by comparison. 3,10,11,20 Modeling the FSSW process is a challenge because unlike friction-stir welding, which can be approximated as a steady-state process, FSSW is in nonsteady state and has a constantly evolving material flow and temperature distribution.…”

Section: Introductionmentioning

confidence: 99%

Temperature and Material Flow Prediction in Friction-Stir Spot Welding of Advanced High-Strength Steel

Miles

Karki

Hovanski

2014

JOM

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Friction-stir spot welding (FSSW) has been shown to be capable of joining advanced high-strength steel, with its flexibility in controlling the heat of welding and the resulting microstructure of the joint. This makes FSSW a potential alternative to resistance spot welding if tool life is sufficiently high, and if machine spindle loads are sufficiently low that the process can be implemented on an industrial robot. Robots for spot welding can typically sustain vertical loads of about 8 kN, but FSSW at tool speeds of less than 3000 rpm cause loads that are too high, in the range of 11-14 kN. Therefore, in the current work, tool speeds of 5000 rpm were employed to generate heat more quickly and to reduce welding loads to acceptable levels. Si 3 N 4 tools were used for the welding experiments on 1.2-mm DP 980 steel. The FSSW process was modeled with a finite element approach using the Forge Ò software. An updated Lagrangian scheme with explicit time integration was employed to predict the flow of the sheet material, subjected to boundary conditions of a rotating tool and a fixed backing plate. Material flow was calculated from a velocity field that is two-dimensional, but heat generated by friction was computed by a novel approach, where the rotational velocity component imparted to the sheet by the tool surface was included in the thermal boundary conditions. An isotropic, viscoplastic Norton-Hoff law was used to compute the material flow stress as a function of strain, strain rate, and temperature. The model predicted welding temperatures to within 4%, and the position of the joint interface to within 10%, of the experimental results.

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Characteristics of Microstructure in Ultrahigh Carbon Steel Produced during Friction Stir Welding

Cited by 26 publications

References 27 publications

Microstructural Evolution of DP980 Steel during Friction Bit Joining

Microstructural Evolution of DP980 Steel during Friction Bit Joining

The Status of Friction Stir Welding Applications to Ferrous Materials

Temperature and Material Flow Prediction in Friction-Stir Spot Welding of Advanced High-Strength Steel

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