Combined Effects of Different Overload Ratios and Nitriding Process on Fatigue Crack Growth of AISI 4140 Steel

被引：6

作者：

Sengul, A. B. ^{[1
]}

Celik, A. ^{[2
]}

机构：

[1] Canakkale Onsekiz Mart Univ, Dept Mech Engn, TR-17020 Canakkale, Turkey

[2] Ataturk Univ, Dept Mech Engn, TR-25240 Erzurum, Turkey

来源：

JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL | 2014年 / 21卷 / 08期

关键词：

fatigue crack growth; plasma nitriding; overload ratio; retardation; digital image correlation; IMAGE-ANALYSIS; BEHAVIOR; IMPROVEMENT; ALLOY;

D O I：

10.1016/S1006-706X(14)60144-8

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The combined effects of different overload ratios (OLRs) and nitriding process on fatigue crack growth (FCG) were analyzed. Steel compact tension specimens made of AISI 4140 steel were subjected to the plasma nitrification process using a gas mixture of 50% N-2 and 50% H-2 at 500 degrees C for 2 h. Structural properties of the samples were studied by scanning electron microscopy, optical microscopy, microhardness testing and digital imaging. Plasma nitriding slowed down FCG, but the crack growth retardation caused by the overload was reduced when the OLR was 2. 0 and 2. 5. Nitriding did not take effect when the OLR was 1. 5 and 3. 0.

引用

页码：797 / 803

页数：7

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