Investigating ion nitriding for the reduction of dissolution and soldering in die-casting shot sleeves

Joshi, Vivek; Srivastava, Amit Kumar; Shivpuri, Rajiv; Roliński, E.

doi:10.1016/s0257-8972(02)00693-x

Cited by 36 publications

(17 citation statements)

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“…Al 다이캐스팅 공정은 치수정밀도가 뛰어나고 주조성이 우 수하여 복잡한 모양의 부품을 제조할 뿐만 아니라 높은 생산 성을 가진 경제적인 주조방법 중의 하나로서, 자동차 관련 부품을 시작으로 전기 관련 부품, 일반기계 등 다양한 분야에 서 사용되고 있다 [1,2]. 그러나 기존의 다이캐스팅 공정 시 캐비티 내부에 형성되는 주조 결함은 내구재와 같은 고강도가 요구되는 부품에 대한 적용을 제한했으며, 이러한 내부 결함 은 대부분은 사출시 혼입되는 공기에 의해 다이캐스팅 주물 내 10~40cc / 100gAl의 많은 가스기포결함을 형성한다 [3][4][5].…”

Section: 서 론unclassified

Effect of Casting Thickness and Plunger Velocity on Porosity in Al Plate Diecasting

Kang¹,

Park²,

Kim³

et al. 2015

Journal of Korea Foundry Society

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The Al die casting process has been widely used in the manufacturing of automotive parts when the process requires near-net shape casting and a high productive rate. However, porosity arises in the casting process, and this hampers the wider use of this method for the creation of high-durability automotive components. The porosity can be controlled by the shot condition, but, it is critical to set the shot condition in the sleeve, and it remains difficult to optimize the shot condition to avoid air entrapment efficiently. In this study, the 4.5 mm, 2.0 mm plate die castings were fabricated under various shot conditions, such as plunger velocities of 0.7 m/s~3.0 m/s and fast shot set points of the cavity of −25%, 0%, 25%, and 50%. The mold filling behavior of Al melts in the cavity was analyzed by a numerical method. Also, according to the shot conditions, the results of numerical analyses were compared to those of die-casting experiments. The porosity levels of the plate castings were analyzed by X-ray CT images and by density and microstructural analyses. The effects of the porosity on the mechanical properties were analyzed by tensile tests and hardness tests. The simulation results are in good general agreements with the die-casting experimental results. When plunger velocity and fast shot set point are 1.0 m/s and cavity 25% position, castings had optimum condition for good mechanical properties and a low level of porosity.

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Section: 서 론unclassified

Effect of Casting Thickness and Plunger Velocity on Porosity in Al Plate Diecasting

Kang¹,

Park²,

Kim³

et al. 2015

Journal of Korea Foundry Society

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“…On one hand, many surface treatments were studied to address at least one of these problems: nitriding [1,[3][4][5][6][7] and shot peening [8] for thermal fatigue resistance; steel boriding [9][10][11], vanadium carbide diffusion layers [2], thin nitride PVD coatings [12][13][14][15][16][17] and thermallysprayed boride coatings [18,19] mainly for corrosion resistance; oxide [20] or carbide [21] coatings for improved lubrication at high temperatures.…”

Section: Introductionmentioning

confidence: 99%

Thermal fatigue resistance of plasma sprayed yttria-stabilised zirconia onto borided hot work tool steel, bonded with a NiCrAlY coating: Experiments and modelling

D’Ans¹,

Dille²,

Debouverie³

2011

Surface and Coatings Technology

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Repeated fast surface temperature transients can damage the materials and/or their surface treatments by thermal fatigue. This happens in aluminium diecasting devices. One conducted thermal fatigue tests with samples of hot work tool steel, respectively untreated, simply borided and protected by a multi-layer. In the last case, top coat is yttria stabilised zirconia (YSZ), followed by a nickel superalloy and then a borided layer (undercoat). The zirconia coating was applied with plasma spray. The multi-layer showed poor resistance during the thermal fatigue tests. Better understanding these tests and the resulting thermal fatigue observed on the treated materials was achieved by a lifetime model based on Coffin-Manson equations.

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“…Investigation on soldering is mainly conducted using immersion tests, [3][4][5][6][7] in which samples are immersed in the liquid aluminium alloys for periods varying from a few seconds up to ,24 h. The melt is kept at temperatures ranging from 600 to 700uC, the samples (or the melt) being rotated or sustained in fixed upholders. The interaction between the samples and the melt is usually characterised by the nature and respective thickness of the formed adherent layers.…”

Section: Introductionmentioning

confidence: 99%

Characterisation of interface formed at 650°C between AISI H13 steel and Al–12Si–1Cu aluminium melt

Duarte

Oliveira

Costa

2010

International Journal of Cast Metals Research

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Quenched and tempered, nitrided and oxidised die casting pins were tested in order to evaluate their response to the corrosion imposed by the contact against a molten aluminium alloy. A static immersion apparatus was used to maintain the pin surfaces, and the aluminium alloy melt at 650uC from 5 up to 50 000 s. The pins were characterised by scanning electron microscopy using advanced electron dispersive X-ray spectroscopy capabilities that enable deeper characterisation of the soldering phenomenon occurring in steel/molten aluminium alloy interfaces. The achieved results indicate that nitrided and oxidised surfaces present non-wetting behaviour, whereas the quenched and tempered surface is easily wetted. Mechanical soldering occurs after short immersion times, while chemical soldering takes place for longer immersion periods. Chemically soldered material is composed of four layers. The two nearest layers from steel are the intermetallics Al 5 (Fe, Mn, Cr) 2 and Al 12 (Fe, Mn, Cr) 3 Si 2 . The third layer has a chemical composition that resulted from the aluminium alloy enrichment with Fe, Cr and Mn. The outer layer corresponds to the solidified aluminium alloy. The growth equations for the four layers of the quenched and tempered samples were identified, and a formation mechanism for intermetallic phases is proposed.

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Investigating ion nitriding for the reduction of dissolution and soldering in die-casting shot sleeves

Cited by 36 publications

References 1 publication

Effect of Casting Thickness and Plunger Velocity on Porosity in Al Plate Diecasting

Effect of Casting Thickness and Plunger Velocity on Porosity in Al Plate Diecasting

Thermal fatigue resistance of plasma sprayed yttria-stabilised zirconia onto borided hot work tool steel, bonded with a NiCrAlY coating: Experiments and modelling

Characterisation of interface formed at 650°C between AISI H13 steel and Al–12Si–1Cu aluminium melt

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