Metallurgical Analysis of Failed M250 Maraging Steel Piston Rod of Tension Reduction Device Used in Aerospace System

被引：0
|
作者：
Ranjith, R. [1 ]
Manwatkar, Sushant K. [1 ]
Gupta, Rohit Kumar [1 ]
机构：
[1] Vikram Sarabhai Space Ctr, Mat & Mech Ent, Thiruvananthapuram 695022, India
来源：
JOURNAL OF FAILURE ANALYSIS AND PREVENTION | 2023年 / 23卷 / 01期
关键词：
Tension reduction device; Piston rod; Stress corrosion cracking; Brittle intergranular cracks; Maraging steel; CORROSION; FAILURE;
D O I：
10.1007/s11668-022-01549-9
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
M250 Maraging steel is widely used in satellite launch vehicle-related systems due to its excellent combination of strength and toughness. Tension reduction device (TRD) is used in horizontal separation system to reduce the band tension gradually from 100(+5) to 20(+5)kN just before separation. During the disassembly of TRD after structural qualification test, one maraging steel piston rod was found broken. Detailed metallurgical analysis was carried out on the failed piston rod to understand the cause of failure. Fractographic observations on the piston rod revealed intergranular and cleavage features indicative of brittle mode of failure. Corrosion pits and cracks were observed on the outer surface near the fracture edge. The chemical composition analysis by energy-dispersive spectroscope (EDS) at the edges of the fracture surface revealed corrosion products. Presence of chlorine in the corrosion products was also noticed. Based on the detailed metallurgical analysis, the failure of the piston rod was attributed to stress corrosion cracking.
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页码：99 / 107
页数：9
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