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Title: Relationship between Material Properties and Local Formability of DP980 Steels

Abstract

A noticeable degree of inconsistent forming behaviors has been observed for the 1st generation advanced high strength steels (AHSS) in production, and they appear to be associated with the inherent microstructural-level inhomogeneities for various AHSS. This indicates that the basic material property requirements and screening methods currently used for the mild steels and high strength low alloys (HSLA) are no longer sufficient for qualifying today’s AHSS. In order to establish more relevant material acceptance criteria for AHSS, the fundamental understandings on key mechanical properties and microstructural features influencing the local formability of AHSS need to be developed. For this purpose, in this study, DP980 was selected as model steels and eight different types of DP980 sheet steels were acquired from various steel suppliers. Various experiments were then performed on the eight different DP980 steels such as chemical composition analysis, static tensile test, hole expansion test, channel forming test. Scanning electron microscope (SEM) pictures of the DP980 steels were also obtained, and image processing tools were then adopted to those SEM pictures in order to quantify their various microstructural features. The results show that all DP980 steels show large discrepancy in their performance and that the tensile properties and hole expansionmore » properties of these steels do not correlate with their local formability. According to the results up to date, it is not possible to correlate the microstructural features alone to the macroscopically measured deformation behaviors. In addition to image analysis, other experiments (i.e., nano-indentation test) are also planned to quantify the individual phase properties of the various DP steels.« less

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1092025
Report Number(s):
PNNL-SA-84223
VT0505000
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Conference
Resource Relation:
Conference: SAE 2012 World Congress & & Exhibition, April 24, 2012, Detroit, Michigan, SAE Technical Paper 2012-01-0042
Country of Publication:
United States
Language:
English
Subject:
DP steel; Local formability; Tensile test; Hole expansion test; Forming test; Microstructure

Citation Formats

Choi, Kyoo Sil, Soulami, Ayoub, Li, Dongsheng, Sun, Xin, Khaleel, Mohammad A., Xu, Le, and Barlat, Frederic. Relationship between Material Properties and Local Formability of DP980 Steels. United States: N. p., 2012. Web. doi:10.4271/2012-01-0042.
Choi, Kyoo Sil, Soulami, Ayoub, Li, Dongsheng, Sun, Xin, Khaleel, Mohammad A., Xu, Le, & Barlat, Frederic. Relationship between Material Properties and Local Formability of DP980 Steels. United States. doi:10.4271/2012-01-0042.
Choi, Kyoo Sil, Soulami, Ayoub, Li, Dongsheng, Sun, Xin, Khaleel, Mohammad A., Xu, Le, and Barlat, Frederic. Tue . "Relationship between Material Properties and Local Formability of DP980 Steels". United States. doi:10.4271/2012-01-0042.
@article{osti_1092025,
title = {Relationship between Material Properties and Local Formability of DP980 Steels},
author = {Choi, Kyoo Sil and Soulami, Ayoub and Li, Dongsheng and Sun, Xin and Khaleel, Mohammad A. and Xu, Le and Barlat, Frederic},
abstractNote = {A noticeable degree of inconsistent forming behaviors has been observed for the 1st generation advanced high strength steels (AHSS) in production, and they appear to be associated with the inherent microstructural-level inhomogeneities for various AHSS. This indicates that the basic material property requirements and screening methods currently used for the mild steels and high strength low alloys (HSLA) are no longer sufficient for qualifying today’s AHSS. In order to establish more relevant material acceptance criteria for AHSS, the fundamental understandings on key mechanical properties and microstructural features influencing the local formability of AHSS need to be developed. For this purpose, in this study, DP980 was selected as model steels and eight different types of DP980 sheet steels were acquired from various steel suppliers. Various experiments were then performed on the eight different DP980 steels such as chemical composition analysis, static tensile test, hole expansion test, channel forming test. Scanning electron microscope (SEM) pictures of the DP980 steels were also obtained, and image processing tools were then adopted to those SEM pictures in order to quantify their various microstructural features. The results show that all DP980 steels show large discrepancy in their performance and that the tensile properties and hole expansion properties of these steels do not correlate with their local formability. According to the results up to date, it is not possible to correlate the microstructural features alone to the macroscopically measured deformation behaviors. In addition to image analysis, other experiments (i.e., nano-indentation test) are also planned to quantify the individual phase properties of the various DP steels.},
doi = {10.4271/2012-01-0042},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2012},
month = {4}
}

Conference:
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