Evaluation of dynamic fracture toughness based reference temperature (T0dy() of modified 9Cr-1Mo steel in phosphorus embrittled and cold-worked condition

被引：15

作者：

Sathyanarayanan, S. ^{[1
]}

Moitra, A. ^{[1
]}

Samuel, K. G. ^{[1
]}

Sasikalaa, G. ^{[1
]}

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

Singh, V. ^{[2
]}

机构：

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

[2] Banaras Hindu Univ, Inst Technol, Dept Met Engn, Varanasi 221005, Uttar Pradesh, India

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2008年 / 488卷 / 1-2期

关键词：

DBTT; fracture toughness; reference temperature; master curve; cold work;

D O I：

10.1016/j.msea.2007.11.051

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

In the present study, the DBTT of a high phosphorus bearing modified 9Cr-1Mo steel in normalized and tempered (N&T) condition and also after 5% and 10% cold work, has been evaluated by extending the reference temperature (T-0) based Master Curve approach to dynamic loading conditions. The reference temperature in dynamic loading condition (T-0(dy)) thus determined is found to be significantly high for the N&T Mod.9Cr-1Mo steel as compared to plain 9Cr-1Mo steel. Cold-work effect was not found to be significant in T-0(dy) evaluation of Mod.9Cr-1Mo steel. The high T-0(dy) of the present Mod.9Cr-1Mo steel is attributed to a fracture initiation mechanism predominated by decohesion of prior austenitic grain boundaries at the fatigue pre-crack front. This is attributed to segregation of phosphorus along the prior austenitic grain boundaries Causing embrittlement, supported by SEM and Secondary Ion Mass Spectrometry (SIMS) observations. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：519 / 528

页数：10

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