Effect of temperature on microstructure and formability of Al-10 mass% Si coatings

Zhang, Jie; Jiang, Sheming; Zhang, Qifu; Liu, Changsheng

doi:10.1016/s1006-706x(16)30044-9

Cited by 25 publications

(11 citation statements)

References 12 publications

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“…Subsequently, the attempt to use lubricant oils was abandoned due to complex cleaning procedures and a high risk for hydrogen-induced embrittlement [15]. Currently, various types of coatings, including aluminized coating [16][17][18][19][20], galvanized and galvannealed coatings [21][22][23], Zn-Ni alloy coating [24,25], sol-gel hybrid coating [26] and Al-Zn alloy coating [27], were developed industrially. Among which, Type 1 aluminized coating, Al-Si with a near eutectic composition, has been widely applied on high-strength boron steel sheets [28].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Fatigue Endurance by Al-Si Coating in Hot-Stamping Boron Steel Sheet

Tan

et al. 2019

Metals

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Most structural components undertake cyclic loads in engineering and failures always cause catastrophic economic losses and casualties. In the present work, the phase evolution of Al-Si coating of high-strength boron steel during hot stamping was investigated. Two types of 1500 MPa grade boron steel sheets, one with Al-Si coating and the other without, were studied to reveal the effect on the high-cycle fatigue behavior. The as-received continuously hot-dip Al-Si coating was composed of α(Al), eutectic Al-Si and τ5. After hot stamping at 1193 K, three phases formed in this coating: β2, Fe(Al,Si)2 and α(Fe). The experimental results showed that the endurance limit of the coated steel sheet was 370 MPa under 107 fully reversed tension-compression loading cycles as opposed to 305 MPa in the uncoated sheet. Both the coated and the uncoated specimens showed surface-induced transgranular fatigue fractures. In the uncoated sheet, the fatigue cracks were generated from the decarburization surface, but the Al-Si coating effectively prevented the occurrence of near-surface decarburization during high-temperature hot stamping, and the only cracks in the coated steel sheet were initiated at wire-cutting surfaces.

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Section: Introductionmentioning

confidence: 99%

Enhancement of Fatigue Endurance by Al-Si Coating in Hot-Stamping Boron Steel Sheet

Tan

et al. 2019

Metals

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“…The sublayer closer to the steel interface (labeled with points 6 and 7 in Figure 4 a) is described in the majority of the literature [ 6 , 17 , 20 , 21 , 22 , 29 ] as an α-Fe(Al,Si) solid solution, which is reasonable, since Al and Si are strong ferrite stabilizers that diffuse to the steel substrate during austenitization. However, some studies [ 5 , 23 ] identified this layer as Fe 3 Al, which has also been reported by others [ 4 , 32 ], wherein the authors described the phase transformation of high-temperature α-Fe(Al, Si) to the low-temperature stable Fe 3 Al (D0 3 ) ordered phase. In the present study, the concentration gradient of Al and Si in this sublayer (α-Fe(Al, Si)/Fe 3 Al) was noticed, which is shown in the SEM-EDS map in Figure 5 , and the chemical composition is shown in Table 3 .…”

Section: Resultsmentioning

confidence: 60%

“…Furthermore, the continuous layer or island-like phase, denoted as FeAl in previous works, was described as Fe 2 SiAl 2 (τ 1 ) and Fe 2 Si 2 Al 5 (τ 2 ) in Refs. [ 5 , 22 , 23 ], with an interdiffusion layer formed of Fe 3 Al [ 5 , 23 ]. The most recent work from Cho et al [ 24 ] stated that the three-phase interdiffusion layer consisted of α-Fe(Al), Fe 3 Al, FeAl, the matrix of Fe 2 Al 5 , and a continuous layer or island-like phase distributed in the matrix as a mixture of FeAl and an unidentified Fe x Al x Si z ternary phase.…”

Section: Introductionmentioning

confidence: 99%

Phase Composition of Al-Si Coating from the Initial State to the Hot-Stamped Condition

et al. 2021

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The chemical and phase composition of the coating and the coating/substrate interface of an Al-Si-coated 22MnB5 hot stamped steel was investigated by means of SEM-EDS, XRD, micro-XRD and electron diffraction. Moreover, the surface profile was analyzed by XPS and roughness measurements. The XPS measurements showed that the thickness of the Si and Al oxide layers increased from 14 to 76 nm after die-quenching, and that the surface roughness increased as well as a result of volume changes caused by phase transformations. In addition to the FeAl(Si) and Fe2Al5 phases and the interdiffusion layer forming complex structures in the coating, electron diffraction confirmed the presence of an Fe2Al5 phase, and also revealed very thin layers of Fe3(Al,Si)C, Fe2(Al,Si)5 and Al-bearing rod-shaped particles in the immediate vicinity of the steel interface. Moreover, the scattered nonuniform layer of the Fe2Al8Si phase was identified in the outermost layer of the coating. Despite numerous studies devoted to researching the phase composition of the Al-Si coating applied to hot stamped steel, electron diffraction revealed very thin layers and particles on the coating/substrate interface and outermost layer, which have not been analyzed in detail.

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“…Due to its light weight, high specific strength, high thermal conductivity, high electrical conductivity, corrosion resistance, low thermal expansion coefficient and good fluidity, Al-Si-Mg alloy have been developed in communication field [1][2][3]. With the development of communication technology, the wall thickness of radiators for communication base station is getting thinner and thinner, which increases the possibility of fracture during transportation and installation [4].…”

Section: Introductionmentioning

confidence: 99%

Precipitation behavior and tensile properties of A356.2 alloy with different high temperature pre-precipitation temperatures

Ding

Chang

Guo

et al. 2022

Mater. Res. Express

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In order to understand the effect of high temperature pre-precipitation (HTPP) temperature on the precipitation behavior and tensile properties of A356.2 alloy treated by Al-6Sr-7La master alloy, SEM, TEM and tensile tests were applied to investigate the evolution of fracture morphology and precipitates of the alloys under different HTPP temperatures. The results showed that ultimate tensile strength (UTS) and yield strength (YS) of the alloys decrease and elongation (El) increases with HTPP temperature decreasing. When HTPP temperature decreased from 510 °C to 470 °C coarsen coherent β″ phase appear in α-Al matrix, continue to decrease HTPP temperature to 450 °C the main precipitate transformed into semi-coherent β′ phase, leading to the change in mechanical properties. In addition, coarsening and transformation of the precipitate were attributed to the reduction of Si concentration which decreases with HTPP temperature decreasing. Moreover, Si nanoparticles precipitated in α-Al matrix, leading to the decreasing of UTS and YS to certain extent due to reducing Si concentration during aging process.

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Effect of temperature on microstructure and formability of Al-10 mass% Si coatings

Cited by 25 publications

References 12 publications

Enhancement of Fatigue Endurance by Al-Si Coating in Hot-Stamping Boron Steel Sheet

Enhancement of Fatigue Endurance by Al-Si Coating in Hot-Stamping Boron Steel Sheet

Phase Composition of Al-Si Coating from the Initial State to the Hot-Stamped Condition

Precipitation behavior and tensile properties of A356.2 alloy with different high temperature pre-precipitation temperatures

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