Effect of Cu addition on microstructure and impact toughness in the simulated coarse-grained heat-affected zone of high-strength low-alloy steels
Effect of Cu addition on microstructure and impact toughness in the simulated coarse-grained heat-affected zone of high-strength low-alloy steels
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DOI：
10.1080/02670836.2016.1238647
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发表时间：
2017-03
影响因子：
1.8
通讯作者：
G. Huang;X. Wan;Kaiming Wu;O. Isayev;O. Hress;I. Rodionova;A. Shirzadi
中科院分区：
文献类型：
--
作者：
G. Huang;X. Wan;Kaiming Wu;O. Isayev;O. Hress;I. Rodionova;A. Shirzadi
研究了Cu含量对低合金高强钢模拟粗晶热影响区（CGHAZ）组织和冲击韧性的影响。据观察，在模拟CGHAZ的无Cu钢的显微组织是由一个小的比例的针状铁素体和主要的贝氏体与马氏体-奥氏体成分为主。而在0.45和1.01%Cu钢中，由于外层为MnS和CuS的晶内夹杂物的有效形核，针状铁素体显著增加。针状铁素体的形成归因于含0.45%Cu钢的上级高热影响区的冲击韧性。此外，含Cu 1.01%钢的模拟CGHAZ中马氏体-奥氏体组元和ε-Cu析出物的增加导致冲击韧性下降。
The effects of Cu content on microstructure and impact toughness in the simulated coarse-grained heat-affected zone (CGHAZ) of high-strength low-alloy steels were investigated. It has been observed that the microstructure in the simulated CGHAZ of Cu-free steel is dominated by a small proportion of acicular ferrite and predominantly bainite with martensite–austenite constituent. Whereas, in the 0.45 and 1.01% Cu-containing steels, the acicular ferrite increased significantly due to the effective nucleation on intragranular inclusions with outer layer of MnS and CuS. The formation of acicular ferrite is attributed to superior high heat-affected zone impact toughness in the 0.45% Cu-containing steel. Furthermore, the increasing martensite–austenite constituent and ε-Cu precipitates in the simulated CGHAZ of 1.01% Cu-containing steel caused degradation in impact toughness.