Failure of 35NCD16 steel fastener - A metallurgical investigation

被引：11

作者：

Jha, Abhay K. ^{[1
]}

Sreekumar, K. ^{[1
]}

Mittal, M. C. ^{[2
]}

Sinha, P. P. ^{[3
]}

机构：

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

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

[3] Indian Space Res Org, Vikram Sarabhai Space Ctr, Mat & Mech Ent, Trivandrum 695022, Kerala, India

来源：

ENGINEERING FAILURE ANALYSIS | 2009年 / 16卷 / 01期

关键词：

35NCD16; steel; Hydrogen embrittlement; HYDROGEN;

D O I：

10.1016/j.engfailanal.2008.05.003

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Cadmium plated 35NCD16 steel threaded fasteners are being used tor aerospace applications. One such fastener, used in retainer assembly of holder interface of solid propellant motor case, parted into two pieces during its removal. The fastener was torqued to 10 Nm and was in assembly for a cumulative period of 45 days. The fracture surface of the failed fastener had a narrow central region consisted of dimples, while its surrounding region exhibited intergranular facets. From the evidence, it was concluded that the fastener failed due to hydrogen embrittlement. The possible sources for the hydrogen entrapment in the material were the furnace environment during heat treatment of the steel or inadequate baking of electroplated cadmium deposits. This paper highlights the details of metallurgical investigations carried out. (c) 2008 Elsevier Ltd. All rights reserved.

引用

页码：302 / 308

页数：7

共 8 条

[1]

[Anonymous], 1987, MET HDB, V13, P427

[2] HYDROGEN-ENHANCED LOCALIZED PLASTICITY - A MECHANISM FOR HYDROGEN-RELATED FRACTURE [J].