Influence of strain-history on deformation-induced austenite transformation in 304 stainless steel sheet

1987 ◽  
Vol 58 (10) ◽  
pp. 472-476
Author(s):  
Mirosław Piwecki
Keyword(s):  
Stainless Steel ◽  
Steel Sheet ◽  
304 Stainless Steel ◽  
Strain History ◽  
Stainless Steel Sheet ◽  
Austenite Transformation

TENSILE AND FRACTURE BEHAVIOUR OF VERY THIN 304 STAINLESS STEEL SHEET

2016 ◽  
Vol 78 (6-9) ◽  
Author(s):  
Ammar Adil Al-Bakri ◽  
Zainuddin Sajuri ◽  
Ahmad Kamal Ariffin ◽  
Mohammed Abdul Razzaq ◽  
Mohd Salehudin Fafmin
Keyword(s):  
Stainless Steel ◽  
Cross Section ◽  
Steel Sheet ◽  
Rectangular Cross Section ◽  
Fracture Morphology ◽  
304 Stainless Steel ◽  
Stainless Steel Sheet ◽  
Steel Sheets ◽  
Ductile Mode ◽  
Mode Formation

Specimen with rectangular cross-section usually used to measure the tensile properties of materials. However, the specimen size and thickness may affect the results. In this study, tensile and fracture behaviours of very thin 304 stainless steel sheet were investigated. The thickness of the stainless steel sheets investigated were 100 and 300 µm. Tensile samples were cut into dumbbell-shaped of rectangular cross-section with same width for both thickness according to ASTM E8. The results showed that 100 µm thin steel sheet exhibited higher tensile strength with no clear evidence of yielding as compared to 300 µm sheet. The fracture morphology images observed by scanning electron microscopy revealed that both specimens fracture in ductile mode. Formation of dimples on the fracture surface could be recognized easily in 300 µm sample at higher magnification as compared to 100 µm sample.

Design of Lapping Paste in Lapping 304 Ultra-Thin Stainless Steel Sheet

2014 ◽  
Vol 1027 ◽  
pp. 93-96
Author(s):  
Song Zhan Fan ◽  
Su Fang Fu ◽  
Jian Guo Yao ◽  
Li Jie Ma ◽  
Jian Xiu Su
Keyword(s):  
Stainless Steel ◽  
Steel Sheet ◽  
Orthogonal Experiment ◽  
Steel Substrate ◽  
304 Stainless Steel ◽  
Stainless Steel Sheet ◽  
Range Analysis ◽  
Flexible Display ◽  
Ultra Precision ◽  
Materials Used

Ultra-thin stainless steel sheet is likely to be the ideal substrate materials used for flexible display. In order to obtain ultra-thin stainless steel substrate with high accuracy, low surface roughness and without damage, the ultra-precision lapping and chemical mechanical polishing technology must be used. In this paper, the lapping paste for stainless steel has been designed using the orthogonal experiment method. According to the range analysis method, an optimal lapping paste had been obtained. Tests lapping the 304 stainless steel sheet with the optimal lapping paste have been done. The test results show that the MRR is about 240nm/min and the surface rough Ra is about 128 nm. This research results can provide theory support for ultra precision machining the stainless steel.

Modeling and Quantification of the Electroplastic Effect When Bending Stainless Steel Sheet Metal

2010 ◽  
Author(s):  
Wesley A. Salandro ◽  
Cristina Bunget ◽  
Laine Mears
Keyword(s):  
Stainless Steel ◽  
Sheet Metal ◽  
Steel Sheet ◽  
Superplastic Forming ◽  
High Strength ◽  
304 Stainless Steel ◽  
Stainless Steel Sheet ◽  
Design Strategies ◽  
Electroplastic Effect ◽  
Electrically Assisted

Automotive manufacturers are continuously striving to meet economic demands by designing and manufacturing more efficient and better performing vehicles. To aid this effort, many manufacturers are using different design strategies such to reduce the overall size/weight of certain automotive components without compromising strength or durability. Stainless steel is a popular material for such uses (i.e. bumpers and fuel tanks) since it possesses both high strength and ductility, and it is relatively light for its strength. However, with current forming processes (e.g., hot working, incremental forming, and superplastic forming), extremely complex components cannot always be easily produced, thus, limiting the potential weight-saving and performance benefits that could be achieved otherwise. Electrically-Assisted Manufacturing (EAM) is an emerging manufacturing technique that has been proven capable of significantly increasing the formability of many automotive alloys, hence the “electroplastic effect”. In this technique, electricity can be applied in many ways (e.g., pulsed, cycled, or continuous) to metals undergoing different types of deformation (e.g., compression, tension, bending). When applied, the electricity lowers the required deformation forces, increases part displacement or elongation, and can reduce or eliminate springback in formed parts. Within this study, the effects of EAM on the bending of 304 Stainless Steel sheet metal will be characterized and modeled for different die widths and electrical flux densities. In previous works, EAM has proven to be highly successful on this particular material. Comparison of 3-point bending force profiles for non-electrical baseline tests and various EAM tests will help to illustrate electricity’s effectiveness. An electroplastic bending coefficient will be introduced and used for modeling an electrically-assisted bending process. Additionally, the springback reductions attained from EAM will be quantified and compared. From this work, a better overall understanding of the effects and benefits of EAM on bending processes will be explained.

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