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Title: Determining Individual Phase Properties in a Multi-phase Q&P Steel using Multi-scale Indentation Tests

Abstract

A new inverse method was developed to predict the stress-strain behaviors of constituent phases in a multi-phase steel using the load-depth curves measured in nanoindentation tests combined with microhardness measurements. A power law hardening response was assumed for each phase, and an empirical relationship between hardness and yield strength was assumed. Adjustment was made to eliminate the indentation size effect and indenter bluntness effect. With the newly developed inverse method and statistical analysis of the hardness histogram for each phase, the average stress-strain curves of individual phases in a quench and partitioning (Q&P) steel, including austenite, tempered martensite and untempered martensite, were calculated and the results were compared with the phase properties obtained by in-situ high energy X-ray diffraction (HEXRD) test. It is demonstrated that multi-scale instrumented indentation tests together with the new inverse method are capable of determining the individual phase flow properties in multi-phase alloys.

Authors:
; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1240218
Report Number(s):
PNNL-SA-113399
Journal ID: ISSN 0921-5093; 600306000
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing
Additional Journal Information:
Journal Volume: 652; Journal ID: ISSN 0921-5093
Publisher:
Elsevier
Country of Publication:
United States
Language:
English

Citation Formats

Cheng, Guang, Choi, Kyoo Sil, Hu, Xiaohua, and Sun, Xin. Determining Individual Phase Properties in a Multi-phase Q&P Steel using Multi-scale Indentation Tests. United States: N. p., 2016. Web. doi:10.1016/j.msea.2015.11.072.
Cheng, Guang, Choi, Kyoo Sil, Hu, Xiaohua, & Sun, Xin. Determining Individual Phase Properties in a Multi-phase Q&P Steel using Multi-scale Indentation Tests. United States. doi:10.1016/j.msea.2015.11.072.
Cheng, Guang, Choi, Kyoo Sil, Hu, Xiaohua, and Sun, Xin. Fri . "Determining Individual Phase Properties in a Multi-phase Q&P Steel using Multi-scale Indentation Tests". United States. doi:10.1016/j.msea.2015.11.072.
@article{osti_1240218,
title = {Determining Individual Phase Properties in a Multi-phase Q&P Steel using Multi-scale Indentation Tests},
author = {Cheng, Guang and Choi, Kyoo Sil and Hu, Xiaohua and Sun, Xin},
abstractNote = {A new inverse method was developed to predict the stress-strain behaviors of constituent phases in a multi-phase steel using the load-depth curves measured in nanoindentation tests combined with microhardness measurements. A power law hardening response was assumed for each phase, and an empirical relationship between hardness and yield strength was assumed. Adjustment was made to eliminate the indentation size effect and indenter bluntness effect. With the newly developed inverse method and statistical analysis of the hardness histogram for each phase, the average stress-strain curves of individual phases in a quench and partitioning (Q&P) steel, including austenite, tempered martensite and untempered martensite, were calculated and the results were compared with the phase properties obtained by in-situ high energy X-ray diffraction (HEXRD) test. It is demonstrated that multi-scale instrumented indentation tests together with the new inverse method are capable of determining the individual phase flow properties in multi-phase alloys.},
doi = {10.1016/j.msea.2015.11.072},
journal = {Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing},
issn = {0921-5093},
number = ,
volume = 652,
place = {United States},
year = {2016},
month = {1}
}