Effects of tantalum content on the microstructure and mechanical properties of low-carbon RAFM steel
Effects of tantalum content on the microstructure and mechanical properties of low-carbon RAFM steel
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钽含量对低碳RAFM钢显微组织和力学性能的影响
DOI：
10.1016/j.jnucmat.2016.07.029
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发表时间：
2016-10-01
影响因子：
3.1
通讯作者：
Li, Huijun
中科院分区：
文献类型：
--
作者：
Chen, Jianguo;Liu, Chenxi;Li, Huijun
为了探讨钽含量对低碳还原活化铁素体/马氏体钢组织和力学性能的影响，设计了三种不同钽含量（0%、0.027%、0.073%）的低碳还原活化铁素体/马氏体钢。研究了低碳RAFM钢的析出行为及其对力学性能的影响。结果表明：随着钽含量的增加，原奥氏体晶粒尺寸减小，沿原奥氏体晶界和包状晶界析出的M23C6碳化物增多，晶内MX纳米颗粒增多；无论钽含量如何，低碳RAFM钢的冲击性能都很好。随着钽含量的增加，合金的冲击性能和硬度明显提高，这可能与增加了MX的数量，减少了M23C6有关。600℃以下高温拉伸性能随钽含量的增加变化不大，800℃高温拉伸性能随钽含量的增加而提高。这意味着MX碳化物对高温下的拉伸性能更为重要。(C) 2016 Elsevier B.V.版权所有
In order to explore the influence of tantalum content on the microstructure and mechanical properties of low carbon RAFM (reduced activation ferritic/martensitic) steels, three low carbon RAFM steels with different tantalum contents (0%, 0.027%, 0.073%) were designed. The precipitation behavior and effect of precipitates on the mechanical properties of the Low-C RAFM steel were investigated. The results indicate that increase of tantalum content causes decrease of the prior austenite grain size and the amount of M23C6 carbides precipitated along prior austenite grain boundaries and packet boundaries as well as increase of the amount of MX nano-sized particles within intragranular regions. The impact properties of low carbon RAFM steels are excellent regardless of the tantalum content. The impact properties and hardness are obviously improved by increasing tantalum content, which may be related to increase of the number of MX and decrease of M23C6. Furthermore, the tensile properties at elevated temperature below 600 degrees C are hardly changed with increase of tantalum content, yet those at 800 degrees C are improved with increasing tantalum content. This implies that MX carbides would be more important for tensile properties at higher temperature. (C) 2016 Elsevier B.V. All rights reserved.