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Title: | Hardening mechanisms and impact toughening of a high-strength steel containing low Ni and Cu additions | Authors: | Kong, HJ Xu, C Bu, CC Da, C Luan, JH Jiao, ZB Chen, G Liu, CT |
Issue Date: | Jun-2019 | Source: | Acta materialia, 15 June 2019, v. 172, p. 150-160 | Abstract: | Aging treatments at 400–550 °C are commonly used to attain a peak strengthening for the Cu-rich nanocluster-strengthened high-strength low-alloy (HSLA) steels. However, these temperatures fall within the dangerous 300–600 °C temper-embrittlement regime, leading to poor impact toughness. On the other hand, aging at temperatures above the embrittlement regime can improve the impact toughness but at a great expense of strength. In this work, the strengthening mechanisms as well as the toughening of a low cost weldable HSLA steel with a low content of carbon (C ∼0.08 wt.%), nickel (Ni = 0.78 wt.%), and copper (Cu = 1.3 wt.%) were carefully investigated. Our findings show that the low-C-Ni-Cu HSLA steel is insensitive to the aging temperatures and can achieve a yield strength (YS) and ultimate tensile strength (UTS) over 1000 and 1100 MPa, respectively, with tensile ductility >10% (reduction of area >60%) at a heat-treat temperature of 640 °C through multiple strengthening mechanisms. Besides, a good low-temperature (−40 °C) impact performance (∼200 J) with high YS (∼900 MPa) and UTS (∼1000 MPa) can be obtained by seeking a strength balance among the fine grain size (∼2.5 μm), medium-sized (∼14 nm) overaged Cu-rich precipitates, tempered martensite, and fresh martensite (or carbides). Moreover, a relatively lower YS (∼800 MPa) and UTS (∼900 MPa) useful for steel manufacturing can be attained by a prolonged aging at 640 °C. In addition, the dislocation-precipitate interactions were also explored based on the dislocation theories in this study. | Keywords: | Cu-rich nanocluster-strengthened high-strength low alloy (HSLA) steel Dislocation-precipitate interactions Impact toughening Multiple strengthening mechanisms Temper-embrittlement |
Publisher: | Elsevier Ltd | Journal: | Acta materialia | ISSN: | 1359-6454 | EISSN: | 1873-2453 | DOI: | 10.1016/j.actamat.2019.04.041 | Rights: | © 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/. The following publication Kong, H. J., Xu, C., Bu, C. C., Da, C., Luan, J. H., Jiao, Z. B., ... & Liu, C. T. (2019). Hardening mechanisms and impact toughening of a high-strength steel containing low Ni and Cu additions. Acta Materialia, 172, 150-160 is available at https://doi.org/10.1016/j.actamat.2019.04.041. |
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Jiao_Hardening_Mechanisms_Impact.pdf | Pre-Published version | 1.91 MB | Adobe PDF | View/Open |
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