Hydrogen embrittlement of 3.5Ni-1.5Cr-0.5Mo steel fastener

被引：20

作者：

Jha, Abhay K. ^{[1
]}

Narayanan, P. Ramesh ^{[1
]}

Sreekumar, K. ^{[1
]}

Mittal, M. C. ^{[1
]}

Ninan, K. N. ^{[1
]}

机构：

[1] Vikram Sarabhai Space Ctr, Indian Space Res Org, Mat & Met Grp, Mat Characterizat Div, Trivandrum 695022, Kerala, India

来源：

ENGINEERING FAILURE ANALYSIS | 2008年 / 15卷 / 05期

关键词：

35NCD16; steel; hydrogen embrittlement;

D O I：

10.1016/j.engfailanal.2007.05.008

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Cadmium plated 35NCD 16 steel threaded fasteners are used for aerospace applications. One such fastener parted into two pieces during application of required torque. The fracture surface of the failed fastener consisted of two distinct regions, a bright region at the center encircled by a relatively dark region. The dark region spread all along the periphery of the fracture surface, Fractography revealed that the central bright region consisted of dimples, while the dark region consisted of intergranular facets. From the evidences it was concluded that the fastener failed due to hydrogen embrittlement. The possible sources for hydrogen entrapment in the material were the uncontrolled furnace atmosphere during long spheroidization treatment and inadequate baking after cadmium plating. (C) 2007 Elsevier Ltd. All rights reserved.

引用

页码：431 / 439

页数：9