High temperature processed high Nb X80 steel with excellent heat-affected zone toughness

作者：Zhu Zhixiong; Han Jian^*; Li Huijun; Lu Cheng

来源：Materials Letters, 2016, 163: 171-174.

DOI：10.1016/j.matlet.2015.10.071

• Microstructure
• Electron microscopy
• Metals and alloys
• Welding

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 (OBIT). The improved toughness

• 出版日期2016-1-15