Effects of tool rotation speed on the mechanical properties and microstructure of friction stir welded ODS steel

Yabuuchi, Kiyohiro; Tsuda, N.; Kimura, Akihiko; Morisada, Yoshiaki; Fujii, Hidetoshi; Serizawa, Hisashi; Nogami, Shuhei; Hasegawa, Akira; Nagasaka, Tetsuya

doi:10.1016/j.msea.2013.12.022

Cited by 42 publications

(13 citation statements)

References 11 publications

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“…19. Depending on the heat input and flow pattern developed, the gauge length might have consisted of a variety of inhomogeneous microstructure which has made such an evaluation very challenging [50]. However, joint strength is an important response which determines overall performance of the weldment.…”

Section: Resultsmentioning

confidence: 99%

Experimental studies on friction-stir welding of AA6061 using Inconel 601 tool

Haldar

Datta

Kumar³

2018

J Braz. Soc. Mech. Sci. Eng.

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Nickel-based superalloy Inconel 601 has been used as tool material during friction-stir butt welding of AA6061-T6 plates. The unique properties of Inconel 601 viz. excellent high-temperature strength, strong work-hardening tendency, and high resistance to wear have been reported beneficial to utilize the material for potential use of FSW tool. Welding has been carried out in different combinations of tool rotation and traverse speed; joint performance in terms of ultimate tensile strength and micro-hardness has been studied. Optical microscopy has revealed existence of fine equiaxed gains at the nugget zone promoting relatively more refined grain structure as compared to the parent material. In few specimens, welding induced defects such as weld flash, kissing bond, zigzag line and tunnel defects have been identified. Maximum tensile strength * 133 MPa has been obtained at tool rotational speed * 1120 RPM and traverse speed * 40 mm/min. Fractographic analysis has revealed two distinct types of fracture mode in the specimens which have failed before the joint and at the joint, respectively. The specimens, failed before the weld zone, have corresponded to ductile fracture mode indicating dimples and ripples. On the contrary, beach marks (wavy patterns) have been noticed in the fractographic analysis of specimens which failed at the weld zone. After completing all welding experiments, the tool has been found not affected by wear, profile distortion by plastic deformation. Hence, application of the said tool can be advised provided the cost of machining the tool with desired pin profile is compromised.

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Section: Resultsmentioning

confidence: 99%

Experimental studies on friction-stir welding of AA6061 using Inconel 601 tool

Haldar

Datta

Kumar³

2018

J Braz. Soc. Mech. Sci. Eng.

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“…However, phase transformations and significant changes of grain structures were found in the SZ. Several researchers [5][6][7]11] on microstructural evolution during FSW process of ODS ferritic steels reached an agreement that the recrystallization can be generated in ODS-SZ. Particularly, along with the recrystallization in ODS-SZ, the low angle boundaries (LABs, which have misorientation angles less than 15°) efficiently convert to high angle boundaries (HABs, which have misorientation angles more than 15°) [6,10,12].…”

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confidence: 90%

Modifications of grain-boundary structure by friction stir welding in the joint of nano-structured oxide dispersion strengthened ferritic steel and reduced activation martensitic steel

Wang

Chen

et al. 2015

Scripta Materialia

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“…Oxide dispersion strengthened (ODS) steels are considered to be promising structural materials for advanced nuclear applications, because of their high elevated-temperature strength, creep strength and radiation damage resistance [1]. Favourable properties are mainly attributed to featured microstructures consisting of fine grains and homogenously dispersed nanosized oxide particles [2]. In order to apply ODS steels to large and complicated structures, reliable joining techniques are inevitable and essential.…”

Section: Introductionmentioning

confidence: 99%

Solid State Diffusion Bonding of ODS Eurofer Steel by Spark Plasma Sintering

Brouwer

Richardson

et al. 2020

The Minerals, Metals &Amp; Materials Series

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Oxide dispersion strengthened (ODS) steels are considered to be one of the candidate structural materials for advanced nuclear applications due to their high elevated-temperature strength, corrosion resistance and radiation tolerance. Joining of ODS steels by traditional fusion joining techniques is not applicable, because the melting process results in the coarsening of fine grains and agglomeration of nanosized oxide particles, and consequently a significant loss of strength. Spark plasma sintering (SPS) has recently been employed as a novel joining technique, which could be beneficial for joining ODS steels considering the solid state characteristic. A powder metallurgy prepared ODS Eurofer steel was successfully joined using SPS. The microstructure and mechanical properties of the joints were investigated. An almost defect-free joint was obtained at the selected processing condition. The tensile properties of the joints are comparable to the base material. Fracture analysis shows an intergranular fracture in the as-joined sample, while a ductile fracture with well-defined dimples is found in the tempered sample.

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Effects of tool rotation speed on the mechanical properties and microstructure of friction stir welded ODS steel

Cited by 42 publications

References 11 publications

Experimental studies on friction-stir welding of AA6061 using Inconel 601 tool

Experimental studies on friction-stir welding of AA6061 using Inconel 601 tool

Modifications of grain-boundary structure by friction stir welding in the joint of nano-structured oxide dispersion strengthened ferritic steel and reduced activation martensitic steel

Solid State Diffusion Bonding of ODS Eurofer Steel by Spark Plasma Sintering

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