A Novel Method to Nondestructively Measure the Shear Edge Properties for Edge Cracking Evaluation with Advanced High Strength Steels

2019 ◽  
Author(s):  
Nikky Pathak ◽  
Jiahui Gu ◽  
Hyunok Kim
Keyword(s):  
High Strength Steels ◽  
High Strength ◽  
Advanced High Strength Steels ◽  
Novel Method ◽  
Shear Edge ◽  
Edge Cracking

Effects of Blanking Conditions to Edge Cracking in Stamping of Advanced-High Strength Steels (AHSS)

2018 ◽  
Author(s):  
Jiahui Gu ◽  
Hyunok Kim ◽  
Hua-Chu Shih ◽  
James Dykeman
Keyword(s):  
High Strength Steels ◽  
High Strength ◽  
Advanced High Strength Steels ◽  
Edge Cracking

Numerical Modeling for Hole-Edge Cracking of Advanced High-Strength Steels (AHSS) Components in the Static Bend Test

2011 ◽  
Author(s):  
Hyunok Kim ◽  
William Mohr ◽  
Yu-Ping Yang ◽  
Paul Zelenak ◽  
Menachem Kimchi
Keyword(s):  
Numerical Modeling ◽  
High Strength Steels ◽  
High Strength ◽  
Bend Test ◽  
Advanced High Strength Steels ◽  
Hole Edge ◽  
Edge Cracking

An Innovative Shearing Process for AHSS Edge Stretchability Improvements

2011 ◽  
Vol 133 (6) ◽  
Author(s):  
Hua-Chu Shih ◽  
Ming F. Shi
Keyword(s):  
High Strength Steel ◽  
High Strength Steels ◽  
High Strength ◽  
Straight Edge ◽  
Forming Process ◽  
Expansion Test ◽  
Advanced High Strength Steels ◽  
Sheared Edge ◽  
Shear Edge

A beveled shear hole piercing process has recently been developed for advanced high strength steel (AHSS). The preliminary results have shown the new process is able to improve the quality of the sheared edge and the edge stretchability of AHSS. The goal of the current study is to optimize the beveled shearing process and identify the optimal shearing conditions for AHSS. Four different advanced high strength steels, including DP600, DP780, TRIP780, and DP980 with various thicknesses together with a conventional high strength steel, HSLA50, are selected in this study. The hole expansion test is used to evaluate the effect of shear edge conditions on the edge stretchability. The results show that an optimal selection of the die clearance and the shearing angle results in a less damaged edge, which significantly delays edge fracture in the forming process and increases the edge stretchability for AHSS. To further validate the advantages of the beveled shearing process in improving the shear edge quality of AHSS, a straight edge shearing device with the capability of adjusting the shearing variables (rake angles and die clearance) with respect to different sheet thicknesses was also developed and built. The edge stretchability of the straight edge sheared specimen was then evaluated using the sheared edge tension test. A similar trend to the beveled shear hole piercing process of AHSS is observed, and a significant improvement in the edge stretchability is also obtained with optimal shearing conditions.

Practical Evaluation and Prediction of Edge Cracking in Forming Advanced High Strength Steels (AHSS)

2017 ◽  
Author(s):  
Hyunok Kim ◽  
Jianhui Shang ◽  
James Dykeman ◽  
Anoop Samant ◽  
Clifford Hoschouer
Keyword(s):  
High Strength Steels ◽  
High Strength ◽  
Advanced High Strength Steels ◽  
Practical Evaluation ◽  
Edge Cracking

Advanced-High Strength Steels

2013 ◽  
Author(s):  
Mahmoud Y. Demeri
Keyword(s):  
High Strength Steels ◽  
High Strength ◽  
Advanced High Strength Steels

Numerical modeling of stress-strain relationships for advanced high strength steels

2021 ◽  
Vol 182 ◽  
pp. 106687
Author(s):  
Yu Xia ◽  
Chu Ding ◽  
Zhanjie Li ◽  
Benjamin W. Schafer ◽  
Hannah B. Blum
Keyword(s):  
Numerical Modeling ◽  
High Strength Steels ◽  
High Strength ◽  
Stress Strain ◽  
Advanced High Strength Steels

scholarly journals Heat Treatment Design for a QP Steel: Effect of Partitioning Temperature

Metals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1136
Author(s):  
Marcel Carpio ◽  
Jessica Calvo ◽  
Omar García ◽  
Juan Pablo Pedraza ◽  
José María Cabrera
Keyword(s):  
Retained Austenite ◽  
High Strength Steels ◽  
High Strength ◽  
Tensile Tests ◽  
Quenching Temperature ◽  
Advanced High Strength Steels ◽  
New Family ◽  
Automotive Parts ◽  
Fresh Martensite ◽  
Industry Needs

Designing a new family of advanced high-strength steels (AHSSs) to develop automotive parts that cover early industry needs is the aim of many investigations. One of the candidates in the 3rd family of AHSS are the quenching and partitioning (QP) steels. These steels display an excellent relationship between strength and formability, making them able to fulfill the requirements of safety, while reducing automobile weight to enhance the performance during service. The main attribute of QP steels is the TRIP effect that retained austenite possesses, which allows a significant energy absorption during deformation. The present study is focused on evaluating some process parameters, especially the partitioning temperature, in the microstructures and mechanical properties attained during a QP process. An experimental steel (0.2C-3.5Mn-1.5Si (wt%)) was selected and heated according to the theoretical optimum quenching temperature. For this purpose, heat treatments in a quenching dilatometry and further microstructural and mechanical characterization were carried out by SEM, XRD, EBSD, and hardness and tensile tests, respectively. The samples showed a significant increment in the retained austenite at an increasing partitioning temperature, but with strong penalization on the final ductility due to the large amount of fresh martensite obtained as well.

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