Metallurgical analysis of a failed maraging steel shear screw used in the band separation system of a satellite launch vehicle
详细信息 查看全文
- 作者：S.V.S. Narayana Murty ; susarla.murty@gmail.com" class="auth_mail" title="E-mail the corresponding author ; Sushant K. Manwatkar ; P. Ramesh Narayanan
- 关键词：M250 grade maraging steel ; Shear screw ; Separation system ; Mermen band ; Stress corrosion cracking
- 刊名：Defence Technology
- 出版年：2016
- 出版时间：October 2016
- 年：2016
- 卷：12
- 期：5
- 页码：380-387
- 全文大小：5937 K
文摘
Maraging steels have excellent combination of strength and toughness and are extensively used for a variety of aerospace applications. In one such critical application, this steel was used to fabricate shear screws of a stage separation system in a satellite launch vehicle. During assembly preparations, one of the shear screws which connected the separation band and band end block has failed at the first thread. Microstructural analysis revealed that the crack originated from the root of the thread and propagated in an intergranular mode. The failure is attributed to combined effect of stress and corrosion leading to stress corrosion cracking.