期刊
JOURNAL OF NUCLEAR MATERIALS
卷 449, 期 1-3, 页码 290-299出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnucmat.2013.10.007
关键词
-
资金
- International Nuclear Energy Research Initiative (I-NERI) Collaboration [2010-004-K]
- Office of Nuclear Energy, US Department of Energy [DE-AC05-00OR22725]
- UT-Battelle, LLC
This article is to summarize the process development and key characterization results for the newly-developed Fe-9Cr based nanostructured ferritic alloys (NFAs) with high fracture toughness. One of the major drawbacks from pursuing ultra-high strength in the past development of NFAs is poor fracture toughness at high temperatures although a high fracture toughness is essential to prevent cracking during manufacturing and to mitigate or delay irradiation-induced embrittlement in irradiation environments. A study on fracture mechanism using the NFA 14YWT found that the low-energy grain boundary decohesion in fracture process at a high temperature (>200 degrees C) resulted in low fracture toughness. Lately, efforts have been devoted to explore an integrated process to enhance grain bonding. Two base materials were produced through mechanical milling and hot extrusion and designated as 9YWTV-PM1 and 9YWTV-PM2. Isotherrfial annealing (IA) and controlled rolling (CR) treatments in two phase region were used to enhance diffusion across the interfaces and boundaries. The PM2 alloy after CR treatments showed high fracture toughness (K-JQ) at represented temperatures: 240-280 MPa root m at room temperature and 160-220 MPa root m at 500 degrees C, which indicates that the goal of 100 MPa root m over possible nuclear application temperature range has been well achieved. Furthermore, it is also confirmed by comparison that the CR treatments on 9YWTV-PM2 result in high fracture toughness similar to or higher than those of the conventional ferritic-martensitic steels such as HT9 and NF616. Published by Elsevier B.V.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据