一种400 MPa级铌微合金钢的疲劳性能

钢铁, 2009, 44(8): 85-0.

一种400 MPa级铌微合金钢的疲劳性能

1.1. 东北大学材料电磁过程研究教育部重点实验室，辽宁沈阳 110004

2.2. 辽宁工业大学材料与化学工程学院，辽宁锦州 121001

1.1. Key Laboratory of Education Ministry for Electromagnetic Processing of Materials, Northeastern University, Shenyang 110004， Liaoning, China；2. College of Materials and Chemical Engineering, Liaoning University of Technology, Jinzhou 121001， Liaoning, China

关键词：微合金钢;四点弯曲疲劳;疲劳曲线;裂纹源

Fatigue Behaviour of a 400 MPa Grade Nb Microalloyed Steel

LIU Bingyu , YU Jingyuan , LI Baomian , CUI Jianzhong

Keywords： microalloyed steel;fourpoint flexural fatigue;fatigue curve;crack initiation site

采用四点弯曲疲劳试验研究了应力比为 -0.82和 -1的含铌微合金钢SQ390的疲劳行为，对疲劳断口进行了SEM分析，用试验结果对Soderberg公式进行了验证。结果表明，试验钢的弯曲疲劳曲线呈直线形，两个应力比下的弯曲疲劳强度分别为275 MPa和256 MPa，疲劳裂纹均起源于试样表面。Soderberg公式对低合金钢四点弯曲疲劳试验结果非常适用。

Flexural behavior of Nb microalloyed steel SQ390 with stress ratio of -0.82 and -1 were investigated by using fourpoint flexural fatigue experiments. Fracture morphology was observed with SEM and Soderberg formula was demonstrated by experimental results. The results show that flexural fatigue curves of the SQ390 steels presented linear. Flexural fatigue at different stress ratio were 275 and 256 MPa, respectively. Flexural cracks lied at the surface of the SQ390 steels. Soderberg formula was well applicable to the results of fourpoint flexural fatigue experiments of microalloyed steel.

参考文献

上一张下一张

计量

下载量()
访问量()

作者相关

文章评分

您的评分：
1

0%
2

0%
3

0%
4

0%
5

0%

材料期刊网