Surface hardening of two cast irons by friction stir processing

Fujii, Hidetoshi; Yamaguchi, Yasufumi; Kikuchi, Toshifumi; Kiguchi, Shoji; Nogi, Kiyoshi

doi:10.1088/1742-6596/165/1/012013

Cited by 8 publications

(4 citation statements)

References 9 publications

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“…23 Fujii et al also found a very fine needle-like martensite structure in the stir zone when cast iron was subjected to friction stir process (FSP). 24 It was thought that this structure was generated because the material was locally heated and rapidly cooled during the FSP. The formation of martensite reduces the mechanical properties of FSW weldment.…”

Section: Resultsmentioning

confidence: 99%

Friction stir welding of ductile iron and low carbon steel

Cheng

Lin

2010

Science and Technology of Welding and Joining

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Friction stir welding (FSW) is a low distortion, high quality solid welding. There is no melting during the welding process, which results in improved welding quality. Ductile iron has the advantages of being low cost, of excellent castability, and of being good mechanically. Therefore, it is generally used in many structural engineering parts. In this study, ferritic ductile iron and low carbon steel were used to explore the qualities of dissimilar metal welding under different conditions. The FSW process, changes in the microstructure of the welding area and the mechanical properties of joints were explored. According to the research, we found that when dissimilar metal welding is conducted at 982 rev min 21 with a travelling speed of 72 mm min 21 , flawless welding quality can be obtained if the stir rod rotates counterclockwise with carbon steel fixed in the advancing side and with ductile iron in the retreating side. FSW successfully provided defect free welds. However, fine pearlite and martensite structures appear in the stir zone, which result in mechanical property degradation of weldments. The stir zone in the weldments is very hard due to martensitic transformation. After heat treatment, the tensile strength improves, and the fracture site appears in the base metal of the carbon steel. However, the welding nugget is not completely filled when the stir rod directs ferritic ductile iron to the advancing side in the clockwise direction and carbon steel in the retreating side, which results in defects and lower welding quality.

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Section: Resultsmentioning

confidence: 99%

Friction stir welding of ductile iron and low carbon steel

Cheng

Lin

2010

Science and Technology of Welding and Joining

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“…機械部品には高機能化，長寿命化が求められる．特に動力伝達部材として多用されるシャフト材は，高硬度化による耐摩耗性向上や圧縮残留応力付与による疲労強度の向上が要求される．その要求に対して，高周波焼入れ (Kristoffersen and Vomacka, 2001)やショットピーニング (Fujii, et al, 2009)．摩擦攪拌プロセスは加工面に熱と強ひずみを付与することで，金属表面の結晶粒の微細化や高硬度化が可能である．しかし，これらの表面強化技術の多くは形状加工後の追加工程であり，別装置を用いることとなるため段取り替えが必要となる．切削形の工作機械で形状加工後に直ちに必要部分の表面強化まで行うことができれば，設備投資や段取り替えなどが減り，時間とコストを削減できる．このような課題に対して，笹原ら (Sasahara, et al, 2008 ;笹原他, 2009 ;Kiuchi and Sasahara, 2010 応力が大きくなることが報告されている …”

Section: 緒言unclassified

Frictional stir burnishing on double helical path to satisfy both high hardness and compressive residual stress

Takada

Sasahara

2015

Transactions of the JSME (In Japanese)

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Frictional Stir Burnishing (FSB) is a surface enhancement method after machining without using additional device. The FSB process can be utilized on the machine tool which uses the rotation tools such as a machining center and a multi-tasking machine. Therefore, the FSB process can be applied just after the cutting process on the same machine tool. FSB was applied to the shaft materials of 0.45%C steel by using a multi-tasking machine in this paper. FSB is a process where the burnishing tool rotates at high revolution speed. Then the thin surface layer is rubbed and stirred with a temperature elevation and reduction. However it is difficult to achieve both high hardness and high compressive residual stress by FSB on 0.45%C steel shaft with helical path. In order to overcome this problem, FSB process with double helical path was proposed in this paper. As a result, both high hardness (600 HV) and compressive residual stress (-400 MPa) could be achieved.

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“…The fully matrix transformed into acicular ferrite, Fe3C and martensite with retained austenite aggregates, significant increase of microhardness was achieved up to 1000 HV reference to base metal of 215 HV, and an improvement in erosion wear resistance [26]. Ferritic cast iron FCD450 Vickers hardness of (200 HV as base to about 700 HV) was obtained due formation of fine martensite [27] and was applied to flake cast iron (FC300) and nodular cast iron (FCD700) with pearlitic matrices resulted in fine martensite structure formation, and increased hardness to 700 HV for both cast irons compared to base irons ( 170-210HV) and (200-230 HV) respectively [28].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Hardening Techniques on Wear Resistance and Fatigue Life of Ductile Cast Iron

Obaid,

AlSamarai,

Ahmed

et al. 2024

Jurnal Teknologi

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Many hardening methods have been developed and proposed as an effective technology to produce microstructural modification and improvement of mechanical properties of variety metallic materials. In this experimental study, the effects of applying laser peening (LP) and friction stir processing (FSP) methods on wear resistance and fatigue properties of selected cast iron ASTM A536, grade (80-55-06) with ferrite/pearlite microstructure were investigated. Microscopic study revealed evident refinement and crashing of graphite nodules as 50% of the basic size with FSP and 32% with LP within the processed surfaces hence improving average microhardness by 100% and 48% respectively. The wear resistance and fatigue life were increased by 33% and 122% after FSP whereas, the corresponding increments were 15% and 22% after LP in comparison with the basic ductile iron. These improvements were linked to surface hardening, compressive stresses and structural modification by the employed processes.

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Surface hardening of two cast irons by friction stir processing

Cited by 8 publications

References 9 publications

Friction stir welding of ductile iron and low carbon steel

Friction stir welding of ductile iron and low carbon steel

Frictional stir burnishing on double helical path to satisfy both high hardness and compressive residual stress

The Effect of Hardening Techniques on Wear Resistance and Fatigue Life of Ductile Cast Iron

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