Hydrogen induced plastic damage in pressure vessel steel of 2.25Cr-1Mo

Journal Article · Sat Apr 01 04:00:00 EST 1995 · Scripta Metallurgica et Materialia

DOI:https://doi.org/10.1016/0956-716X(95)00078-A· OSTI ID:39890

Han, G W ^[1]; Song, Y J ^[2]

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1. Central Iron and Steel Research Inst., Beijing (China)
2. Xian Jiaotong Univ. (China)

2.25Cr-1Mo steel is generally employed as a hydrogenation reaction vessel material used at elevated temperature and in a hydrogen containing environment. During service of the reaction vessel, a large number of hydrogen atoms would enter its wall. When the reaction vessel is shutdown and the temperature reduces to about ambient temperature, the hydrogen atoms remaining in the wall would induce plastic damage in the steel. The mechanism of hydrogen induced plastic damage is different for various materials with different microstructures. Investigations have demonstrated that the hydrogen induced plastic damage in carbide annealed carbon steels is caused by hydrogen accelerating the initiating and growing of microvoids from the carbide particles. However, SEM examination on the fracture surface of hydrogen charged tensile specimen of 2.25Cr-1Mo steel show that a large number of fisheyes appear on the fracture surface. This indicates that hydrogen induced plastic damage in 2.25Cr-1Mo steel is related to the occurrence of fisheye cracks during plastic deformation. By means of micro-fracture mechanics to analyze fisheye crack occurrence from the first generation microvoid, the mechanism of hydrogen induced plastic damage in the pressure vessel steel is investigated.

• OSTI ID: 39890
• Journal Information: Scripta Metallurgica et Materialia, Journal Name: Scripta Metallurgica et Materialia Journal Issue: 7 Vol. 32; ISSN SCRMEX; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
36 MATERIALS SCIENCE
CARBON ADDITIONS
CHEMICAL COMPOSITION
CHROMIUM ALLOYS
DAMAGE
FRACTURE PROPERTIES
HYDROGEN ADDITIONS
IRON BASE ALLOYS
MANGANESE ADDITIONS
METALLOGRAPHY
MOLYBDENUM ALLOYS
PETROLEUM REFINERIES
PHOSPHORUS ADDITIONS
PRESSURE VESSELS
SAMPLE PREPARATION
SCANNING ELECTRON MICROSCOPY
SILICON ADDITIONS
SULFUR ADDITIONS
TENSILE PROPERTIES
TIN ADDITIONS