Integration of a new data acquisition/processing scheme in SHPB test and characterization of the dynamic material properties of high-strength steels using the optional form of Johnson-Cook model

2014 ◽  
Vol 28 (9) ◽  
pp. 3561-3568 ◽  
Author(s):  
Brian J. Tuazon ◽  
Kyung-Oh Bae ◽  
Sang-Heon Lee ◽  
Hyung-Seop Shin
Keyword(s):  
Data Acquisition ◽  
Material Properties ◽  
High Strength Steels ◽  
High Strength ◽  
Processing Scheme ◽  
Shpb Test ◽  
Dynamic Material Properties ◽  
Cook Model

scholarly journals Modeling of Forming Limit Bands for Strain-Based Failure-Analysis of Ultra-High-Strength Steels

Metals ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 631 ◽  
Author(s):  
Hamid Bayat ◽  
Sayantan Sarkar ◽  
Bharath Anantharamaiah ◽  
Francesco Italiano ◽  
Aleksandar Bach ◽  
...  
Keyword(s):  
Material Properties ◽  
Driving Forces ◽  
Weight Ratio ◽  
High Strength Steels ◽  
High Strength ◽  
Forming Limit ◽  
Boron Steel ◽  
Passenger Safety ◽  
Ultra High Strength Steels ◽  
Increased Strength

Increased passenger safety and emission control are two of the main driving forces in the automotive industry for the development of light weight constructions. For increased strength to weight ratio, ultra-high-strength steels (UHSSs) are used in car body structures. Prediction of failure in such sheet metals is of high significance in the simulation of car crashes to avoid additional costs and fatalities. However, a disadvantage of this class of metals is a pronounced scatter in their material properties due to e.g., the manufacturing processes. In this work, a robust numerical model is developed in order to take the scatter into account in the prediction of the failure in manganese boron steel (22MnB5). To this end, the underlying material properties which determine the shapes of forming limit curves (FLCs) are obtained from experiments. A modified Marciniak–Kuczynski model is applied to determine the failure limits. By using a statistical approach, the material scatter is quantified in terms of two limiting hardening relations. Finally, the numerical solution obtained from simulations is verified experimentally. By generation of the so called forming limit bands (FLBs), the dispersion of limit strains is captured within the bounds of forming limits instead of a single FLC. In this way, the FLBs separate the whole region into safe, necking and failed zones.

Characterization of Inclusions in 3rd Generation Advanced High-Strength Steels

2019 ◽  
Vol 50 (4) ◽  
pp. 1674-1685 ◽  
Author(s):  
Muhammad Nabeel ◽  
Michelia Alba ◽  
Andrey Karasev ◽  
Pär G. Jönsson ◽  
Neslihan Dogan
Keyword(s):  
High Strength Steels ◽  
High Strength ◽  
Advanced High Strength Steels

Forming-Induced Residual Stress and Material Properties of Roll-Formed High-Strength Steels

2020 ◽  
Vol 3 (3) ◽  
pp. 210-220
Author(s):  
Yong Sun ◽  
Vladimir Luzin ◽  
Yixin Duan ◽  
Rameshkumar Varma ◽  
Lei Shi ◽  
...  
Keyword(s):  
Residual Stress ◽  
Material Properties ◽  
High Strength Steels ◽  
High Strength

Characterization of Tempered 4340 Steel after 1200°C Austenitization

1980 ◽  
Vol 38 ◽  
pp. 380-381
Author(s):  
K. P. Datta ◽  
V. C. Kannan
Keyword(s):  
Fracture Toughness ◽  
High Temperature ◽  
Yield Strength ◽  
High Strength Steels ◽  
High Strength ◽  
Subsequent Tempering ◽  
Considerable Research ◽  
4340 Steel ◽  
Ultra High Strength Steels

Considerable research is in progress to improve the fracture toughness of low alloy ultra-high strength steels such as 4340 while maintaining the same level of yield strength. One such methodis high temperature austenitization (1200° C). Subsequent tempering, in general, renders still higher toughness and hence this study is aimed at characterization of tempered 4340 steel after 1200° C austenitization.

Influence of Manufacturing Processes and Microstructures on the Performance and Manufacturability of Advanced High Strength Steels

2009 ◽  
Vol 131 (4) ◽  
Author(s):  
K. S. Choi ◽  
W. N. Liu ◽  
X. Sun ◽  
M. A. Khaleel ◽  
J. R. Fekete
Keyword(s):  
Material Properties ◽  
Thermomechanical Processing ◽  
High Strength Steels ◽  
High Strength ◽  
Processing Parameters ◽  
Martensite Phase ◽  
Basic Material ◽  
Manufacturing Processes ◽  
Localized Deformation ◽  
Advanced High Strength Steels

Advanced high strength steels (AHSS) are performance-based steel grades and their global material properties can be achieved with various steel chemistries and manufacturing processes, leading to various microstructures. In this paper, we investigate the influence of the manufacturing process and the resulting microstructure difference on the overall mechanical properties, as well as the local formability behaviors of AHSS. For this purpose, we first examined the basic material properties and the transformation kinetics of three different commercial transformation induced plasticity (TRIP) 800 steels under different testing temperatures. The experimental results show that the mechanical and microstructural properties of the TRIP 800 steels significantly depend on the thermomechanical processing parameters employed in making these steels. Next, we examined the local formability of two commercial dual phase (DP) 980 steels which exhibit noticeably different formability during the stamping process. Microstructure-based finite element analyses are carried out to simulate the localized deformation process with the two DP 980 microstructures, and the results suggest that the possible reason for the difference in formability lies in the morphology of the hard martensite phase in the DP microstructure. The results of this study suggest that a set of updated material acceptance and screening criteria is needed to better quantify and ensure the manufacturability of AHSS.

scholarly journals Effect of Quenching and Partitioning Heat Treatment on the Fatigue Behavior of 42SiCr Steel

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1699
Author(s):  
Marco Thomä ◽  
Guntram Wagner
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Heat Treatment ◽  
Material Properties ◽  
Retained Austenite ◽  
Fatigue Behavior ◽  
High Strength Steels ◽  
High Strength ◽  
Advanced High Strength Steels ◽  
Scanning Electron

The manufacturing of advanced high-strength steels with enhanced ductility is a persistent aim of research. The ability of a material to absorb high loads while showing a high deformation behavior is a major task for many industrial fields like the mobility sector. Therefore, the material properties of advanced high-strength steels are one of the most important impact factors on the resulting cyclic fatigue behavior. To adjust advanced material properties, resulting in high tensile strengths as well as an enhanced ductility, the heat treatment process of quenching and partitioning (QP) was developed. The quenching takes place in a field between martensite start and martensite finish temperature and the subsequent partitioning is executed at slightly elevated temperatures. Regarding the sparsely investigated field of fatigue research on quenched and partitioned steels, the present work investigates the influence of a QP heat treatment on the resulting microstructure by light and scanning electron microscopy as well as on the mechanical properties such as tensile strength and resistance against fatigue regarding two different heat treatment conditions (QP1, QP2) in comparison to the cold-rolled base material of 42SiCr steel. Therefore, the microscopic analysis proved the presence of a characteristic quenched and partitioned microstructure consisting of a martensitic matrix and partial areas of retained austenite, whereas carbides were also present. Differences in the amount of retained austenite could be observed by using X-ray diffraction (XRD) for the different QP routes, which influence the mechanical properties resulting in higher tensile strength of about 2000 MPa for QP1 compared to about 1600 MPa for QP2. Furthermore, the transition for the fatigue limit was approximated by using stepwise load increase tests (LIT) and afterwards verified by constant amplitude tests (CAT) in accordance with the staircase method, whereas the QP 1 condition reached the highest fatigue strength of 900 MPa. Subsequent light and scanning electron microscopy of selected fractured surfaces and runouts showed a different behavior regarding the size of the fatigue fracture area and also differences in the microstructure of these runouts.

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