Fatigue behavior and mechanism of FV520B-I welding seams in a very high cycle regime

被引：27

作者：

Zhang, Ming ^{[1
,2
,3
]}

Wang, Weiqiang ^{[1
,3
]}

Wang, Pengfei ^{[1
,3
]}

Liu, Yan ^{[1
,3
]}

Li, Jianfeng ^{[1
,4
]}

机构：

[1] Shandong Univ, Sch Mech Engn, 17923 Jingshi Rd, Jinan 250061, Peoples R China

[2] Qilu Univ Technol, Sch Mech & Automot Engn, 3501 Daxue Rd, Jinan 250353, Peoples R China

[3] Engn & Technol Res Ctr Special Equipment Safety S, 17923 Jingshi Rd, Jinan 250061, Peoples R China

[4] Minist Educ, Key Lab High Efficiency & Clean Mech Manufacture, 17923 Jingshi Rd, Jinan 250061, Peoples R China

来源：

INTERNATIONAL JOURNAL OF FATIGUE | 2016年 / 87卷

关键词：

FV520B-I welding seam; Very high cycle fatigue; Behavior and mechanism; Surface roughness; Characteristic area size; HIGH-STRENGTH STEELS; SUBSURFACE CRACK INITIATION; NON-METALLIC INCLUSIONS; QUANTITATIVE-EVALUATION; SURFACE-ROUGHNESS; WELDED-JOINT; GBF AREA; SIZE; FREQUENCY; FAILURE;

D O I：

10.1016/j.ijfatigue.2016.01.001

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

The fatigue properties of FV520B-I welding seams with different surface roughnesses up to 10(9) cycles were tested, and the fatigue behavior and mechanism in a very high cycle regime were studied. The test results showed that FV520B-I smooth welding seams had obvious characteristics of very high cycle fatigue, and cracks mainly initiated from the subsurface when the fatigue life was higher than 107 cycles. As the surface roughness increased to Ra approximate to 0.6, the S-N curve moved downward and cracks usually initiated from the surface. The surface roughness had no effects on the initiation mechanism of subsurface cracks in the welding seam. The initiation modes of cracks in FV520B-I welding seams were more than those of cracks in FV520B-I. The GBF formation mechanism of "dispersive decohesion of spherical carbide" was supported, and the possible crack growth in the GBF was analyzed according to the "effective short fatigue crack criterion". The relationships of a very high cycle fatigue life and sizes of characteristic areas of fractures were further analyzed. The fatigue life increased with a decrease of inclusion diameter and an increase of the ratio of the GBF diameter to the inclusion (pore) diameter. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：22 / 37

页数：16

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