Effect of Grain Size on Micro Deep Drawing of SUS304 Stainless Steel Square Cup

2015 ◽  
Vol 661 ◽  
pp. 77-82
Author(s):  
Chao Cheng Chang ◽  
Han Sheng Chen
Keyword(s):  
Grain Size ◽  
Stainless Steel ◽  
Deep Drawing ◽  
Side Length ◽  
Design Rules ◽  
Surface Textures ◽  
Steel Sheets ◽  
Sus304 Stainless Steel ◽  
Micro Deep Drawing

The study investigated the effect of grain size on the micro deep drawing of SUS304 stainless steel squares. Three stainless steel sheets with different thicknesses of 0.05 mm, 0.1 mm and 0.2 mm were treated by annealing processes at 1100 °C in which the holding times were varied in order to adjust the grain size. The sheets were used in the micro deep drawing processes for producing the square cups with 3 mm side length and 1.8 mm height. According to the design rules from references, the dimensions of the blank were determined to reduce the variation on the rim height of the square cup. The results showed that two peak values appeared on the load curves and the as-received sheet with the smallest grain size led to the largest load. Moreover, the cases of the as-received sheet with smaller grains had smoother surface textures than those of the annealed sheets with larger grains.

scholarly journals Experimental Investigation on Micro Deep Drawing of Stainless Steel Foils with Different Microstructural Characteristics

2021 ◽  
Vol 34 (1) ◽  
Author(s):  
Jingwei Zhao ◽  
Tao Wang ◽  
Fanghui Jia ◽  
Zhou Li ◽  
Cunlong Zhou ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Deep Drawing ◽  
Annealing Temperature ◽  
Localized Deformation ◽  
Microstructural Characteristics ◽  
Height Profile ◽  
Annealing Temperatures ◽  
Micro Deep Drawing ◽  
Profile Distribution

AbstractIn the present work, austenitic stainless steel (ASS) 304 foils with a thickness of 50 µm were first annealed at temperatures ranging from 700 to 1100 ℃ for 1 h to obtain different microstructural characteristics. Then the effects of microstructural characteristics on the formability of ASS 304 foils and the quality of drawn cups using micro deep drawing (MDD) were studied, and the mechanism involved was discussed. The results show that the as-received ASS 304 foil has a poor formability and cannot be used to form a cup using MDD. Serious wrinkling problem occurs on the drawn cup, and the height profile distribution on the mouth and the symmetry of the drawn cup is quite non-uniform when the annealing temperature is 700 ℃. At annealing temperatures of 900 and 950 ℃, the drawn cups are both characterized with very few wrinkles, and the distribution of height profile, symmetry and mouth thickness are uniform on the mouths of the drawn cups. The wrinkling becomes increasingly significant with a further increase of annealing temperature from 950 to 1100 ℃. The optimal annealing temperatures obtained in this study are 900 and 950 ℃ for reducing the generation of wrinkling, and therefore improving the quality of drawn cups. With non-optimized microstructure, the distribution of the compressive stress in the circumferential direction of the drawn foils becomes inhomogeneous, which is thought to be the cause of the occurrence of localized deformation till wrinkling during MDD.

scholarly journals Study on size effects in micro deep drawing of stainless steel foil

2021 ◽  
Vol 2020 (1) ◽  
pp. 012040
Author(s):  
S N Yuan ◽  
H B Xie ◽  
F H Jia ◽  
H Wu ◽  
D Pan ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Size Effects ◽  
Deep Drawing ◽  
Stainless Steel Foil ◽  
Micro Deep Drawing

scholarly journals Influencia de la anisotropia en la formabilidad de acero inoxidable 439

2019 ◽  
pp. 1-8
Author(s):  
Juan Manuel Salgado-Lopez ◽  
José Luis Ojeda-Elizarrarás ◽  
José Trinidad Pérez-Quiroz ◽  
Hector Javier Vergara-Hernández
Keyword(s):  
Stainless Steel ◽  
Ferritic Stainless Steel ◽  
Deep Drawing ◽  
Metallographic Analysis ◽  
Quantitative Chemical Analysis ◽  
Normal Anisotropy ◽  
Automotive Components ◽  
Steel Sheets ◽  
R Value

This work shows the influence of the normal anisotropy (“r” value) in the deep drawing of AISI 439 ferritic stainless steel sheets. In order to do so, quantitative chemical analysis, metallographic analysis, tensile mechanical properties, and the determination of the “r” value and the “n” value were carried out in two different AISI 439 steel sheets of two different suppliers. In recent years, this ferritic stainless steel has been applied in a deep drawing process of automotive components. In this way, it must be said that one of these ferritic stainless steel sheets cracked due to exhaustion of formability during deep drawing after few steps. On the other hand, the second ferritic stainless steel sheet showed neither cracking nor other type of defects. The results of the tests, which were carried out in this work, probed that the“r” value has a strong influence on the forming behaviour of ferritic steel during deep drawing. This information is very relevant because the AISI 439 standard does not consider the planar anisotropy or the strain hardening coefficient as relevant for designation, but this type of steel is being applied in many forming operations of different components.

Using micro deep drawing with ironing stages to form stainless steel 304 micro cups

2013 ◽  
Vol 15 (2) ◽  
pp. 298-305 ◽  
Author(s):  
Jenn-Terng Gau ◽  
Sujith Teegala ◽  
Kun-Min Huang ◽  
Tun-Jen Hsiao ◽  
Bor-Tsuen Lin
Keyword(s):  
Stainless Steel ◽  
Deep Drawing ◽  
Micro Deep Drawing ◽  
Stainless Steel 304

Effect of Grain Size on Micro Ball Punch Deformation of SUS 304 Stainless Steel

2012 ◽  
Vol 579 ◽  
pp. 445-452 ◽  
Author(s):  
Chao Cheng Chang ◽  
Li Yi Lin
Keyword(s):  
Grain Size ◽  
Stainless Steel ◽  
304 Stainless Steel ◽  
Steel Sheets ◽  
High Production Rate ◽  
Micro Parts ◽  
Deformation Test ◽  
High Production ◽  
Different Diameters ◽  
Deformation Tests

Micro metal forming is widely interested due to its potential in manufacturing micro parts with low costs and high production rate as the demands of compact devices have been increasing in many fields. This study uses micro ball punch deformation tests to investigate the effect of grain size on the formability of SUS 304 stainless steel sheets. The study employed annealing treatments to change the grain size of the sheets. By using three punches in different diameters in associated with three dies having an inner diameter of 2 mm and different die radii, it was able to perform micro bulging tests and obtain the bulging depths which were used to assess the formability of the sheets. The study shows that the grain size does affect the depth of the deformed dome in the ball punch deformation test at the micro scale.

Study of Size Effects on Deformation Behavior and Formability in Micro Metal Forming of Ti Foil

2012 ◽  
Author(s):  
Jie Xu ◽  
Bin Guo ◽  
Debin Shan ◽  
Baishun Li
Keyword(s):  
Grain Size ◽  
Flow Stress ◽  
Size Effects ◽  
Deep Drawing ◽  
Metal Forming ◽  
Deformation Behavior ◽  
Foil Thickness ◽  
Micro Scale ◽  
Micro Deep Drawing ◽  
Micro Parts

Micro forming technology becomes a promising approach to fabricate micro-parts due to its advantages of high productivity, low production cost, good product quality and mechanical properties, and near net or net shape characteristics. However, the deformation behaviors of material change and the so-called size effect occurs when the part dimension is decreased to micro-scale. To analyze the quality of micro-parts, the material flow stress, anisotropy, ductility and formability in micro-scale need to be considered. In the paper, micro tensile and micro deep drawing tests of Ti foils were used and the size effects on deformation behavior and formability of micro sheet metal forming were studied. The results show that the flow stress of Ti foils is related with foil thickness and grain size. The fracture behaviors also have been changed from shear dimple to slip separation with the decrease of foil thickness. The formability of micro deep drawing becomes worse with the decrease of micro cup dimension and the increase of grain size.

scholarly journals Three-dimensional Grain Size Distribution in SUS304 Stainless Steel.

1994 ◽  
Vol 34 (2) ◽  
pp. 186-190 ◽  
Author(s):  
Kiyotaka Matsuura ◽  
Youichi Itoh ◽  
Masayuki Kudoh ◽  
Tatsuya Ohmi ◽  
Kuniyoshi Ishii
Keyword(s):  
Grain Size ◽  
Stainless Steel ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
Three Dimensional ◽  
Sus304 Stainless Steel
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