Q500qE高性能桥梁钢防断性能试验研究.pdf

桥梁建设2016年第46卷第1期(总第236期)
Bridge Construction, Vol, 46, No 1, 2016(Totally No 236)
文章编号:1003一4722(2016)01-0065-05
Q500qE高性能桥梁钢防断性能试验研究
?越
(中国铁道科学研究院铁道建筑研究所,北京100081)
摘要:为研究Q500qE高性能桥梁钢的断裂抗力随温度的变化规律,针对5种不同厚度规
格(16,32,4,50,60mm)的Q500qE高性能桥梁钢母材和焊接接头,进行常温和低温环境条件下
的深缺口宽板拉伸试验。试验结果表明:随着强度的提升以及细化晶粒,板厚32mm以下的
Q500qE高性能桥梁钢母材的断裂韧度K。值总体上高于Q370qE和Q345qD桥梁钢,也比
Q500qE高性能桥梁钢焊接接头高;在试验温度低于-40℃后,板厚4mm以上的Q500qE高性
能桥梁钢母村的K。指标有所下降;与Q3709E和Q345qD桥梁钢焊缝相比,Q500gE高性能桥梁
钢焊接接头的K。没有明显的提高;需要进一步研发提高Q500qE高性能桥梁钢厚板以及焊接接头
防断性能的措施。
关键词:高性能钢;桥梁钢;Q500qE;防断性能;宽板拉仲试验;断裂初度
中图分类号:TU511.3;U446.1文献标志码:A
Experimental Study of Fracture Resistance Properties
of Q500QE High-performance Bridge Steel
TTIAN Yue
(Railway Engineering Research Institute, China Academy of Railway Sciences, Beijing 100081, China)
Abstract: To study the laws of the fracture resistance of the Q500QE high-performance bridge
steel changing with the temperatures, the deep notch wide plate tension tests for the base metals
and welded joints of the Q500ge high-performance bridge steel of 5 kinds of the plate thickness
(16, 32, 44, 50 and 60 mm)were made under the normal and low temperature environmental con-
ditions. The results of the tests indicate that as the strength increases and the grains are refined
the fracture toughness K. value of the base metal of the Q500QE high-performance bridge steel hav
ing the plate thickness less than 32 mm is generally higher than the K. values of the Q370QE and
Q345QD bridge steels and is also higher than the K. value of the welded joint of the Q500QE high
performance bridge steel. At the test temperatures below-40c, the Ke indices of the base met
als of the Q500QE high-performance bridge steel having the plate thickness greater than 44 mm de
crease to some extent and in comparison to the welded joints of the Q370QE and Q345QD bridge
steels, the fracture toughness K. values of the welded joints of the Q500QE high-performance
bridge steel do not increase significantly and therefore, the measures for improving the fracture re
sistance properties of the thick plates and welded joints of the Q500QE high-performance bridge
steel should be further developed
Key words: high-performance steel; bridge steel; Q500QE; fracture resistance property; wide
plate tension test; fracture toughness
收稿日期:2015-07一27
基金项目:铁道部科技研究开发计划项目(2007G029)
Project of Science and Technology Research and Development Program of Ministry of Railways (2007G029)
作者简介:田越,研究员,E- mail: tianyu(@rail,cn。研究方向:钢桥疲劳与断裂及评估加固