Surface and interior residual stress analysis of a deep-drawn 1180-MPa class ultra-high strength steel sheet with scratch marks

2021 ◽  
Author(s):  
Takashi Matsuno ◽  
Yuta Ochiai ◽  
Yoshitaka Okitsu ◽  
Masayuki Iga ◽  
Ami Kohri ◽  
...  
Keyword(s):  
Residual Stress ◽  
Stress Analysis ◽  
High Strength Steel ◽  
Steel Sheet ◽  
High Strength ◽  
Ultra High Strength Steel ◽  
Residual Stress Analysis

Wear and fatigue characteristics of new stamping die material for ultra-high-strength steel sheet

2015 ◽  
Vol 16 (11) ◽  
pp. 2377-2382
Author(s):  
In-Kyu Lee ◽  
Myeong-Sik Jeong ◽  
Sang-Kon Lee ◽  
Yong-Jae Cho ◽  
Jae-Wook Lee ◽  
...  
Keyword(s):  
High Strength Steel ◽  
Steel Sheet ◽  
High Strength ◽  
Stamping Die ◽  
Ultra High Strength Steel ◽  
Die Material ◽  
Fatigue Characteristics

Separation behaviour and crack in trimming of ultra-high strength steel sheet having curved shape

2019 ◽  
Author(s):  
S. Azzmer ◽  
H. Jaafar ◽  
L. Tajul ◽  
M. H. Sulaiman ◽  
Z. Hamedon
Keyword(s):  
High Strength Steel ◽  
Steel Sheet ◽  
High Strength ◽  
Ultra High Strength Steel

Warm and hot punching of ultra high strength steel sheet

CIRP Annals ◽  
2008 ◽  
Vol 57 (1) ◽  
pp. 321-324 ◽  
Author(s):  
K. Mori ◽  
S. Saito ◽  
S. Maki
Keyword(s):  
High Strength Steel ◽  
Steel Sheet ◽  
High Strength ◽  
Ultra High Strength Steel

Direct Punching in Inclined Ultra-High Strength Steel Sheets

2014 ◽  
Vol 622-623 ◽  
pp. 1051-1057 ◽  
Author(s):  
Yohei Abe ◽  
Ken Ichiro Mori ◽  
Shigehiro Nakanoshita ◽  
Purwo Kadarno
Keyword(s):  
High Strength Steel ◽  
Steel Sheet ◽  
High Strength ◽  
Bottom Edge ◽  
Steel Sheets ◽  
Sheared Edge ◽  
Ultra High Strength Steel ◽  
Grade Steel ◽  
Inclined Sheet

A direct punching of inclined ultra-high strength steel sheets having low ductility was carried out to improve the quality of the sheared edge. In the direct punching of an inclined sheet, the contact between the sheet and punch became gradual because of touch from the bottom edge of the punch, and thus the sheared portion tended to bend in the latter half of punching. As the strength of the sheet increased, defects such as burr and secondary burnished surface were occurred around the sheared edge due to the low ductility. The range of direct punching for sheared edge without defects was shown for the high strength steel sheets. To prevent the occurrence of defects, a punch having inclined bottom was used. In this punch, the contact with the sheet was changed, the uniform contact with the inclined bottom was given. In the punch having the inclined bottom, the secondary burnished surface in the edge of 980 MPa grade steel sheet was prevented.

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