Ageing behavior of a Cu-bearing ultrahigh strength steel

被引：39
作者：
Ghosh, Arindam [1 ,2 ]
das, Samar [3 ]
Chatterjee, Subrata [2 ]
机构：
[1] Univ Nevada, Dept Mech Engn, Las Vegas, NV 89154 USA
[2] Bengal Engn & Sci Univ, Dept Met & Mat Engn, Sibpur, India
[3] Natl Met Lab, MTC Div, Jamshedpur 7, Bihar, India
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2008年 / 486卷 / 1-2期
关键词：
ageing; ultrahigh strength steel; copper precipitates; lath martensite; mechanical properties;
D O I：
10.1016/j.msea.2007.08.062
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
On ageing at different temperatures a various combination of properties has been obtained for this Cu-bearing ultrahigh strength steel. A substantial increase in strength has been obtained at 450 degrees C, accompanied by a drop in percentage elongation, percentage reduction in area and toughness. At 550 degrees C temperature extensive epsilon-Cu precipitates have been observed. The increased strength value retained in the temperature range of 450-600 degrees C and a secondary hardening peak obtained at 600 degrees C is probably due to the formation of fine Mo carbide precipitates. The decrease in strength at 650 degrees C along with an increase in percentage elongation, percentage reduction in area and toughness is due to the coarsening of Cu particles and a partial recovery of matrix. At 700 degrees C most of the Cu precipitates become rod shaped and formation of fresh martensite with a dark contrast is observed at the lath boundaries. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码：152 / 157
页数：6
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