High temperature fracture characteristics of a nanostructured ferritic alloy (NFA)

被引：49

作者：

Byun, Thak Sang ^{[1
]}

Kim, Jeoung Han ^{[1
]}

Yoon, Ji Hyun ^{[1
]}

Hoelzer, David T. ^{[1
]}

机构：

[1] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

来源：

JOURNAL OF NUCLEAR MATERIALS | 2010年 / 407卷 / 02期

关键词：

DISPERSION-STRENGTHENED STEELS; RESEARCH-AND-DEVELOPMENT; MECHANICAL-PROPERTIES; NEUTRON-IRRADIATION; MARTENSITIC STEELS; TENSILE PROPERTIES; MOLYBDENUM; STABILITY; OXIDES; 14YWT;

D O I：

10.1016/j.jnucmat.2010.09.031

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The nanostructured ferritic alloys (NFAs) have been developed to improve high temperature strength and radiation resistance by refining grains and including nanoclusters Among the key properties of NFAs needed to be assessed for advanced reactor applications the cracking resistance at high temperatures has not been well known In this work therefore the high temperature fracture behavior has been investigated for the latest nanostructured ferritic alloy 14YWT (SM10) The fracture toughness of the alloy was above 140 MPa root mat low temperatures room temperature (RT) and 200 degrees C but decreased to a low fracture toughness range of 52-82 MPa root mat higher temperatures up to 700 degrees C This behavior was explained by the fractography results indicating that the unique nanostructure of 14YWT alloy produced shallow plasticity layers at high temperatures and a low-ductility grain boundary debonding occurred at 700 degrees C The discussion also proposes methods to improve resistance to cracking Published by Elsevier B V

引用

页码：78 / 82

页数：5

共 26 条

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