Evaluation of quasistatic fracture toughness of a modified 9Cr-1Mo (P91) steel

被引：22

作者：

Sasikala, G. ^{[1
]}

Ray, S. K. ^{[1
]}

机构：

[1] Indira Gandhi Ctr Atom Res, Mat Technol Div, Kalpakkam 603102, Tamil Nadu, India

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2008年 / 479卷 / 1-2期

关键词：

modified 9Cr-1Mo steel; thermal ageing; quasistatic fracture toughness; plastic zone; J-integral;

D O I：

10.1016/j.msea.2007.06.021

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

For a modified 9Cr-1Mo (P91) grade steel in the normalised and tempered (NT) condition and also after accelerated thermal ageing (2900 h at 923 K), the elastic-plastic fracture toughness parameter J for 0.2 mm crack extension, J(0.2), has been determined at 653 and 803 K, and compared with J(0.2) of the NT material at 300 K. It is concluded that this thermal ageing does not significantly influence the toughness at 653 and 803 K. Also testing temperature has a marginal effect on J(0.2) at 300 and 653 K. At 803 K, however, creep effects become so prominent that a basic premise for J-controlled crack growth, namely rate-independent plasticity, is seriously violated, giving rise to anomalously high values of J(0.2). (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：105 / 111

页数：7

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