NDLI: Tailoring Heterogeneous Microstructure in a High-Strength Low-Alloy Steel for Enhanced Strength-Toughness Balance

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Tailoring Heterogeneous Microstructure in a High-Strength Low-Alloy Steel for Enhanced Strength-Toughness Balance

Content Provider	MDPI
Author	Yu, Yishuang Gao, Minliang Hu, Bin Tian, Chang Rong, Xuequan Xie, Zhenjia Guo, Hui Shang, Chengjia
Copyright Year	2021
Description	The attainment of both strength and toughness is of vital importance to most structural materials, although unfortunately they are generally mutually exclusive. Here, we report that simultaneous increases in strength and toughness in a high-strength low-alloy (HSLA) steel were achieved by tailoring the heterogeneous microstructure consisting of soft intercritical ferrite and hard martensite via intercritical heat treatment. The heterogeneous microstructure features were studied from the perspective of morphology and crystallography to uncover the effect on mechanical properties. Specifically, the volume fraction of martensite increased with increasing annealing temperature, which resulted in increased back stress and effective stress, and thereby an improved strength-ductility combination. The enrichment of carbon and alloying elements in the martensite was lowered with the increase in annealing temperature. As a result, the hardness difference between the intercritical ferrite and martensite was reduced. In addition, the globular reversed austenite preferentially grew into the adjacent austenite grain that held no Kurdjumov-Sachs (K-S) orientation relationship with it, which effectively refined the coarse prior austenite grains and increased the density of high angle grain boundaries. The synergy of these two factors contributed to the improved low-temperature toughness. This work demonstrates a strategy for designing heterostructured HSLA steels with superior mechanical properties.
Starting Page	1983
e-ISSN	20754701
DOI	10.3390/met11121983
Journal	Metals
Issue Number	12
Volume Number	11
Language	English
Publisher	MDPI
Publisher Date	2021-12-09
Access Restriction	Open
Subject Keyword	Metals Civil Engineering High-strength Low-alloy Steel Intercritical Heat Treatment Heterogeneous Microstructure Reversed Austenite Yield Ratio Impact Toughness
Content Type	Text
Resource Type	Article

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