High temperature processed high Nb X80 steel with excellent heat-affected zone toughness
High temperature processed high Nb X80 steel with excellent heat-affected zone toughness
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DOI：
10.1016/j.matlet.2015.10.071
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发表时间：
2016-01
影响因子：
3
通讯作者：
Zhi-xiong Zhu;Jian Han;Huijun Li;Cheng Lu
中科院分区：
文献类型：
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作者：
Zhi-xiong Zhu;Jian Han;Huijun Li;Cheng Lu
在这封信中，研究重点是高温处理 (HTP) 高铌 (0.11 wt%) X80 钢的粗晶热影响区 (CGHAZ)。显微组织检查表明，CGHAZ 的显微组织由粒状贝氏体、贝氏体铁素体和马氏体-奥氏体 (M-A) 成分等第二相组成。相对细小的奥氏体晶粒尺寸是由于 Ti-Nb 析出物和固溶 Nb 造成的。夏比 V 型缺口 (CVN) 测试表明，HTP 钢在 CGHAZ 中表现出优异的韧性，这通过较低的延性-脆性转变温度 (DBTT) 来体现。韧性的提高归因于相对细小的原奥氏体晶粒尺寸、细小的亚显微组织和分散的细M-A成分的综合贡献。
In this letter, the investigation focused on the coarse-grained heat-affected zone (CGHAZ) of a high temperature processed (HTP) high Nb (0.11 wt%) X80 steel. The microstructural examination showed that the microstructure of CGHAZ consisted of granular bainite, baintic ferrite and secondary phases such as martensitic–austenitic (M–A) constituent. The comparatively fine austenite grain size was due to both Ti–Nb precipitates and solute Nb. The Charpy V-notch (CVN) testing revealed that the HTP steel exhibited excellent toughness in CGHAZ, which was indicated by the low ductile–brittle transition temperature (DBTT). The improved toughness was ascribed to the combined contribution from the relatively fine prior austenite grain size, fine sub-microstructures and dispersed fine M–A constituent.