Effect of heat treatment on the properties of laser-beam welded rheo-cast F357 aluminum

Theron, Maritha; Knutsen, R.D.; Ivanchev, L.; Burger, H.P.

doi:10.1016/j.jmatprotec.2011.10.010

Cited by 4 publications

(3 citation statements)

References 8 publications

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“…In the case of the T4+ condition, the weld metal hardness was on average only 8 HV 0.3 lower than that of the parent metal, which effectively has experienced the complete T6 heat treatment. Only the pre-weld T6 condition showed a decrease in hardness (± 8 HV 0.3 ) in the HAZ [10].…”

Section: Resultsmentioning

confidence: 94%

Property and Quality Optimization of Laser Welded Rheo-Cast F357 Aluminum Alloy

Theron¹,

Burger²,

Ivanchev³

et al. 2012

SSP

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F357, a hypo-eutectic Al-7%Si-0.6%Mg alloy without beryllium, was processed with CSIR-Rheo technology to the Semi-Solid Metal (SSM) state and cast in plates by means of High Pressure Die Casting. The castings were either left in the as-cast (F) condition or subjected to T4 or T6 heat treatments prior to autogenous Nd:YAG laser welding. A welding operating window was established and within this window, the weld porosity and undercut were minimised. Butt welds complying with ISO 13919-2: 2001 could be produced by means of the optimum parameters of 3.8 kW laser power and a welding speed of 4 m/min with a twin spot laser beam configuration. The mechanical properties of age-hardenable Al-Si-Mg alloys are dependent on the rate at which the alloy is cooled after the solution heat treatment. The low heat input provided by the laser welding process resulted in high enough cooling rates to ensure that both the fusion zone and HAZ were in the T4 condition after welding. Tensile properties equivalent to the parent metal in T6 condition were obtained after subjecting welded T4 plates to conventional artificial ageing treatment.

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Section: Resultsmentioning

confidence: 94%

Property and Quality Optimization of Laser Welded Rheo-Cast F357 Aluminum Alloy

Theron¹,

Burger²,

Ivanchev³

et al. 2012

SSP

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“…Welding. Laser welding of Al-Si-Mg was investigated on a number of occasions [43][44][45] as well as the effect of a number of heat treatments on the welds [46][47][48]. Property and quality optimization of a laser welded Al-Si-Mg alloy will be presented at this conference [49].…”

Section: Materials Propertiesmentioning

confidence: 99%

R-HPDC in South Africa

Curle¹,

Möller²,

Govender³

2012

SSP

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Abstract. The history of semi-solid metal forming and in particular rheo-high pressure die casting at the Council for Scientific and Industrial Research in South Africa is discussed. Processing flexibility is demonstrated on the Al-Si-Mg, Al-Mg-Si, Al-Cu-Mg and Al-Zn-Mg-Cu casting and wrought alloy systems as well as on high purity aluminium, unmodified Al-Si binary eutectic, metal matrix composites and magnesium alloys. Material properties are highlighted.

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“…These are very important aspects in the L-PBF process as it makes it possible to reach full dense and crack-free parts [6][7][8]. The large interest in the AlSi7Mg alloy is proved by the large number of scientific papers available in the literature [9][10][11][12][13][14][15][16]. This alloy is also generally called A357 (AMS 4219 standard) or F357 (AMS 4289 standard) depending on the beryllium content, which is lower than 0.002% in the F357 standard.…”

Section: Introductionmentioning

confidence: 99%

Short Heat Treatments for the F357 Aluminum Alloy Processed by Laser Powder Bed Fusion

et al. 2021

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Conventionally processed precipitation hardening aluminum alloys are generally treated with T6 heat treatments which are time-consuming and generally optimized for conventionally processed microstructures. Alternatively, parts produced by laser powder bed fusion (L-PBF) are characterized by unique microstructures made of very fine and metastable phases. These peculiar features require specifically optimized heat treatments. This work evaluates the effects of a short T6 heat treatment on L-PBF AlSi7Mg samples. The samples underwent a solution step of 15 min at 540 °C followed by water quenching and subsequently by an artificial aging at 170 °C for 2–8 h. The heat treated samples were characterized from a microstructural and mechanical point of view and compared with both as-built and direct aging (DA) treated samples. The results show that a 15 min solution treatment at 540 °C allows the dissolution of the very fine phases obtained during the L-PBF process; the subsequent heat treatment at 170 °C for 6 h makes it possible to obtain slightly lower tensile properties compared to those of the standard T6. With respect to the DA samples, higher elongation was achieved. These results show that this heat treatment can be of great benefit for the industry.

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Effect of heat treatment on the properties of laser-beam welded rheo-cast F357 aluminum

Cited by 4 publications

References 8 publications

Property and Quality Optimization of Laser Welded Rheo-Cast F357 Aluminum Alloy

Property and Quality Optimization of Laser Welded Rheo-Cast F357 Aluminum Alloy

R-HPDC in South Africa

Short Heat Treatments for the F357 Aluminum Alloy Processed by Laser Powder Bed Fusion

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