Fatigue durability of steels of railroad wheels

被引：6

作者：

Ostash, O. P. ^{[1
]}

Andreiko, I. M. ^{[1
]}

Kulyk, V. V. ^{[1
]}

Uzlov, I. H. ^{[2
]}

Babachenko, O. I. ^{[2
]}

机构：

[1] Ukrainian Acad Sci, Karpenko Physicomech Inst, Lvov, Ukraine

[2] Ukrainian Acad Sci, Nekrasov Inst Ferrous Metallurgy, Dnepropetrovsk, Ukraine

来源：

MATERIALS SCIENCE | 2007年 / 43卷 / 03期

关键词：

Fatigue; Fatigue Threshold; Prefracture Zone; Wheel Steel; Railroad Wheel;

D O I：

10.1007/s11003-007-0046-8

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

On the basis of the characteristics of strength, hardness, and fatigue failure resistance, we substantiate the possibility of replacement of the railroad wheels of current production by the developed high-strength wheels. We have revealed an ambiguous influence of the structure and strength level on the fatigue behavior of wheel steels depending on the presence or absence of crack-like defects in their structure. For eliminating this ambiguity, it is proposed to evaluate the endurance of steels with regard for the structural-mechanical parameter (d*). Using the Kitagawa-Takahashi diagram, we predict the safe size of a defect (the diameter of a destroyed inclusion) 2a(0) = d* = 126-186 mu m under cyclic loading. Furthermore, the influence of the sizes of technological defects (of diameter up to 3 mm) on the fatigue characteristics of steels of railroad wheels has been evaluated. We have established that a decrease in the permissible size of technological defects from 3.0 to 1.5 mm will increase two to three times the fatigue durability of wheels.

引用

页码：403 / 414

页数：12

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