Microstructure and mechanical properties of thin varying thickness strips with different transition zones produced by micro flexible rolling

Huo, Mingshuai; Zhao, Jingwei; Xie, Haibo; Li, Shengli; Zhang, Hongmei; Hu, Z. C.; Jiang, Zhengyi

doi:10.1177/0954405418802323

Cited by 8 publications

(3 citation statements)

References 49 publications

(70 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…But the cold-worked metal can be back to the precold-worked condition by an appropriate heat treatment which is called recrystallization. 40,42 In this study, although the temperature was not high enough to occur recrystallization completely, it was enough to eliminate some of the dislocations and decrease the dislocations density. It is the reason that anisotropy of the specimen at ambient temperature is more than the higher temperatures.…”

Section: Resultsmentioning

confidence: 82%

Investigation of forming limit diagram and mechanical properties of the bimetallic Al/Cu composite sheet at different temperatures which fabricated by explosive welding

Alaie

Hashemi

Kazemi

2020

Proceedings of the Institution of Mechanical Engineers, Part B:

View full text Add to dashboard Cite

This research aims to investigate the mechanical properties, fractography and formability of Al/Cu two-layer composite sheets at three temperatures (23 °C, 120 °C and 220 °C). The bimetal sheet was fabricated by the explosive welding method. The anisotropy of the Al/Cu bimetallic composite sheet was investigated. The result showed significant anisotropy in the Al/Cu composite sheet due to the explosive welding process. The Vickers hardness measurements demonstrated that the hardness in both aluminum and copper sides increased because of the work hardening phenomenon. The fractography of the surfaces was investigated by the scanning electron microscope after tensile tests to study the effect of temperature and the direction, which the samples prepared for the tensile test with respect to the explosion direction, on the mechanism of the fracture. For the tensile test, the samples were prepared parallel to the detonation direction [Formula: see text] and two other directions with respect to the explosion direction [Formula: see text] from the AA1100/Cu10100 bimetallic sheet. Finally, the forming limit diagram of the Al/Cu composite sheet was determined at the three mentioned temperatures. The results demonstrated that temperature and the direction had a considerable effect on the mechanism of the rupture and formability. As the temperature of the specimen rises, the regions that brittle fracture happened became less and the formability improved significantly. The formability of the Al/Cu composite sheet enhanced about 34.8% when the temperature increased from 23 °C to 120 °C and 67.5% when it increased from 120 °C to 220 °C.

show abstract

Section: Resultsmentioning

confidence: 82%

Investigation of forming limit diagram and mechanical properties of the bimetallic Al/Cu composite sheet at different temperatures which fabricated by explosive welding

Alaie

Hashemi

Kazemi

2020

Proceedings of the Institution of Mechanical Engineers, Part B:

View full text Add to dashboard Cite

show abstract

“…The FSB is a forming method in which the whole die is discretized into several roller dies which can be adjusted independently at different positions, so as to form different target shapes. 16–22 This forming method can be used for multiple purposes with one machine, reducing production costs, and improving production efficiency. Figure 1 is the schematic diagram of the overall die stretch bending forming and multi-point die stretch bending forming.…”

Section: The Fsb Processmentioning

confidence: 99%

The influence of multi-point roller-dies on the shape deviation differences of profile in flexible stretch-bending forming

Liang

Han

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part B:

View full text Add to dashboard Cite

In the process of flexible 3D stretch bending, the shape deviation difference between the contact zone and non-contact zone is studied. It is obvious that in the contact zone, the die regulates the deformation of the profile to make it conform to the target shape with small shape deviation; in the non-contact zone, the profile has no die restriction and deviates from the target shape with large shape deviation. When the dies are placed equidistantly along the x-axis, the shape deviation of the non-contact zone near the clamp side is greater than that near the middle of the profile. Arrange the distance between adjacent dies in equal ratio along the x-axis, so that the spacing near the clamp side is a little smaller, and the spacing near the middle of the profile is a bit larger. The difference between the shape deviation of the non-contact zone profile near the clamp side and the middle of the profile decreases, and the maximum shape deviation is reduced, which greatly improves the processing accuracy and quality. However, with the increase of the distance difference between adjacent dies, the shape deviation difference of the non-contact zone near the middle of the profile also increases greatly. Although the clamp side decreases, the maximum shape deviation has become the shape deviation of the profile in the non-contact zone near the middle of the profile.

show abstract

“…Traditional liquid lubricants can effectively reduce friction in many macro-scale metal forming processes. However, they cannot be directly applied in the MDD process because the lubricant film is hard to form and maintain under high contact pressure at the micro scale [ 13 , 14 , 15 , 16 ]. To address this problem, adding nanoparticles (NPs) into the base lubricant has been identified as one of the best solutions [ 9 , 16 , 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Analysis of TiO2 Nanolubricant Influence in Micro Deep Drawing of Stainless Steel SUS301

et al. 2023

Self Cite

View full text Add to dashboard Cite

To improve the quality of products produced from microforming, various nanolubricants have been applied in the field of micromanufacturing in recent years. In this paper, the effects of glycerol-based lubricant containing TiO2 NPs (NPs) on micro deep drawing (MDD) of austenitic stainless steel (ASS) SUS301 were studied, and the lubrication mechanism involved was discussed. The MDD experiments were conducted with the SUS301 foils under dry, 1, 2, and 4 wt% TiO2 NP lubrication conditions. The results show that the use of the TiO2 nanolubricants can significantly improve the quality of the drawn cups in terms of decreased wrinkling and surface roughness. Besides, the concentration of TiO2 NPs influences lubricity by reducing friction during the MDD process. The peak drawing force is the lowest when 2 wt% nanolubricant is applied, which drops to 72.54 N from 77.38 N under dry conditions. The micro cup drawn under 2 wt% TiO2 nanolubricant has the best quality among those obtained under all the lubrication conditions. The lubrication mechanisms are derived from the mending effects of TiO2 NPs and the formation of thin lubricant films associated with the open lubricant pockets (OLPs) and close lubricant pocket (CLPs) theory in the MDD. The CLPs function as reservoirs that retain lubricants to counteract the load pressure, whereas the OLPs lead to lubricant leakage due to the higher flow resistance. It was found that the lubricant film and NPs are insufficient at a low concentration (1 wt%), while the lubrication performance can be enhanced with increased NP concentration. However, there exist apparent agglomerations on the surface of the produced micro cup when using 4 wt% nanolubricant, which greatly deteriorates the lubricant performance in the MDD process. It is concluded that the lubricant containing 2 wt% TiO2 NPs demonstrates the best lubrication performance during the MDD of ASS SUS301.

show abstract

Microstructure and mechanical properties of thin varying thickness strips with different transition zones produced by micro flexible rolling

Abstract: Microstructure and mechanical properties of thin varying thickness strips with Microstructure and mechanical properties of thin varying thickness strips with different transition zones produced by micro flexible rolling different transition zones produced by micro flexible rolling

Cited by 8 publications

References 49 publications

Investigation of forming limit diagram and mechanical properties of the bimetallic Al/Cu composite sheet at different temperatures which fabricated by explosive welding

Investigation of forming limit diagram and mechanical properties of the bimetallic Al/Cu composite sheet at different temperatures which fabricated by explosive welding

The influence of multi-point roller-dies on the shape deviation differences of profile in flexible stretch-bending forming

Analysis of TiO2 Nanolubricant Influence in Micro Deep Drawing of Stainless Steel SUS301

Contact Info

Product

Resources

About