Effect of Boron on Creep Strength of High Cr Steel Welds

被引：0
|
作者：
Tabuchi, Masaaki [1 ]
Hongo, Hiromichi [1 ]
Sawada, Kota [1 ]
Takahashi, Yukio [1 ]
机构：
[1] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan
来源：
CREEP & FRACTURE IN HIGH TEMPERATURE COMPONENTS: DESIGN & LIFE ASSESSMENT ISSUES, PROCEEDINGS | 2009年
关键词：
High Cr Ferritic Steel; Welded Joint; Creep; Type-IV failure; Boron; Nitrogen Content; HEAT-RESISTANT STEEL;
D O I：
暂无
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
Creep strength of high Cr steel welds is decreased during long-term services at high temperatures due to Type-IV damages formed in the fine-grained heat affected zone (HAZ). Aiming at improving the creep strength of welds, we have investigated the effect of boron content on the microstructures and creep strength of HAZ for the 9Cr and 12Cr heat resisting steels. It was found that the creep strength of HAZ of these steels could be improved by addition of about 0.01% boron with low nitrogen. For the 9Cr steel, while formation of the fine-grained HAZ structures was inevitable independent of boron and nitrogen contents, the creep strength of HAZ and welded joint could be improved by utilizing the grain boundary strengthening effect of boron. For the 12Cr steel with 0.01% boron and low nitrogen, formation of the fine-grained microstructures during weld thermal cycle was suppressed and consequently the creep strength of HAZ and welded joint was considerably improved.
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页码：227 / +
页数：2
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