Hydrogen Embrittlement of PH 13-8 Mo Stainless Steel—The Effect of Surface Condition

CORROSION ◽  
1984 ◽  
Vol 40 (4) ◽  
pp. 146-151 ◽  
Author(s):  
G. T. Murray ◽  
H. H. Honegger ◽  
T. Mousel
Keyword(s):  
Stainless Steel ◽  
Hydrogen Embrittlement ◽  
Precipitation Hardening ◽  
Surface Condition ◽  
Tensile Tests ◽  
Time To Failure ◽  
Hydrogen Charging ◽  
Charging Time ◽  
Cold Worked ◽  
Effect Of Surface

Abstract The susceptibility of precipitation hardening 13-8 Mo stainless steel to hydrogen embrittlement (HE) was measured by both post hydrogen charging tensile tests and by time to failure tests while being subjected to hydrogen charging and a static stress below the yield stress. In the former, it was found that the ductility was decreased substantially after only 30 min charging time. The strength was markedly reduced after 2 h charging time. In the delayed failure tests, it was found that a localized cold worked surface condition promoted crack formation.

scholarly journals The Role of Hydrogen in Hydrogen Embrittlement of Metals: The Case of Stainless Steel

Metals ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 406 ◽  
Author(s):  
Young Kim ◽  
Sung Kim ◽  
Byung Choe
Keyword(s):  
Stainless Steel ◽  
Hydrogen Embrittlement ◽  
Focused Ion Beam ◽  
Materials Science ◽  
Ion Beam ◽  
Tensile Tests ◽  
Lattice Contraction ◽  
Thin Foils ◽  
Before And After ◽  
Cold Worked

Hydrogen embrittlement (HE) of metals has remained a mystery in materials science for more than a century. To try to clarify this mystery, tensile tests were conducted at room temperature (RT) on a 316 stainless steel (SS) in air and hydrogen of 70 MPa. With an aim to directly observe the effect of hydrogen on ordering of 316 SS during deformation, electron diffraction patterns and images were obtained from thin foils made by a focused ion beam from the fracture surfaces of the tensile specimens. To prove lattice contraction by ordering, a 40% CW 316 SS specimen was thermally aged at 400 °C to incur ordering and its lattice contraction by ordering was determined using neutron diffraction by measuring its lattice parameters before and after aging. We demonstrate that atomic ordering is promoted by hydrogen, leading to formation of short-range order and a high number of planar dislocations in the 316 SS, and causing its anisotropic lattice contraction. Hence, hydrogen embrittlement of metals is controlled by hydrogen-enhanced ordering during RT deformation in hydrogen. Hydrogen-enhanced ordering will cause the ordered metals to be more resistant to HE than the disordered ones, which is evidenced by the previous observations where furnace-cooled metals with order are more resistant to HE than water-quenched or cold worked metals with disorder. This finding strongly supports our proposal that strain-induced martensite is a disordered phase.

Effect of the Electro-Chemical Hydrogen Charging Time on Hydrogen Embrittlement of X70 Steel Using for Gas Pipeline

2013 ◽  
Vol 51 (11) ◽  
pp. 813-820
Author(s):  
Chi-Eun Sung ◽  
Hyeon-Jee Jeon ◽  
Jin-Kyung Lee ◽  
In-Soo Son ◽  
Sang-Pill Lee ◽  
...  
Keyword(s):  
Hydrogen Embrittlement ◽  
Gas Pipeline ◽  
Hydrogen Charging ◽  
Charging Time

scholarly journals Hydrogen Embrittlement Behavior of 18Ni 300 Maraging Steel Produced by Selective Laser Melting

Materials ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2360 ◽  
Author(s):  
Young Jin Kwon ◽  
Riccardo Casati ◽  
Mauro Coduri ◽  
Maurizio Vedani ◽  
Chong Soo Lee
Keyword(s):  
Hydrogen Embrittlement ◽  
Maraging Steel ◽  
Selective Laser Melting ◽  
Solution Treatment ◽  
Tensile Tests ◽  
Constant Current ◽  
Hydrogen Atoms ◽  
Laser Melting ◽  
Constant Current Density ◽  
Hydrogen Charging

A study was performed to investigate the hydrogen embrittlement behavior of 18-Ni 300 maraging steel produced by selective laser melting and subjected to different heat treatment strategies. Hydrogen was pre-charged into the tensile samples by an electro-chemical method at the constant current density of 1 A m−2 and 50 A m−2 for 48 h at room temperature. Charged and uncharged specimens were subjected to tensile tests and the hydrogen concentration was eventually analysed using quadrupole mass spectroscopy. After tensile tests, uncharged maraging samples showed fracture surfaces with dimples. Conversely, in H-charged alloys, quasi-cleavage mode fractures occurred. A lower concentration of trapped hydrogen atoms and higher elongation at fracture were measured in the H-charged samples that were subjected to solution treatment prior to hydrogen charging, compared to the as-built counterparts. Isothermal aging treatment performed at 460 °C for 8 h before hydrogen charging increased the concentration of trapped hydrogen, giving rise to higher hydrogen embrittlement susceptibility.

Comparison of Behaviour of Different Variants of Hydrogenated TRIP Steels at Slow Strain Rate Tests

2019 ◽  
Vol 810 ◽  
pp. 70-75
Author(s):  
Petra Váňová ◽  
Jaroslav Sojka ◽  
Kateřina Konečná ◽  
Taťána Radkovská
Keyword(s):  
Hydrogen Embrittlement ◽  
Hydrogen Absorption ◽  
Potassium Thiocyanate ◽  
Tensile Tests ◽  
Fracture Characteristics ◽  
Trip Steels ◽  
Hydrogen Charging ◽  
Metallic Inclusions ◽  
Significant Difference ◽  
Fracture Micromechanism

The paper describes effect of hydrogen on mechanical properties and fracture characteristics of two types of C-Mn-Si TRIP steel; laboratory prepared steel TRIP 800 and commercially manufactured steel TRIP 780. TRIP steels are very promising materials thanks to their combination of a very good strength and toughness. However, these steels can be embrittled by hydrogen during technological operations related to galvanizing. That is why the knowledge of effects of hydrogen on the properties and fracture characteristics of the TRIP steels is of particular importance. In the presented study, effects of hydrogen were studied by tensile tests after electrolytical hydrogen charging. Electrolytical hydrogen charging was performed in 0.05 M solution of sulfuric acid with addition of potassium thiocyanate to promote hydrogen absorption. Hydrogen provoked embrittlement in both steel variants and changed their fracture micromechanism. Hydrogen embrittlement manifested itself mainly by a loss of plasticity. Index of hydrogen embrittlement, expressed on the basic of a relative drop of elongation to fracture, reached values about 77 % for the steel variant TRIP 800, resp. 83 % for the steel variant TRIP 780. No significant difference was observed between two steel variants studied. Concerning fractographic characteristics, steels containing hydrogen displayed quasi-cleavage fracture mostly on the edges of the sample and around elongated non-metallic inclusions.

Effect of hydrogen charging time on hydrogen embrittlement of CoCrFeMnNi high-entropy alloy

2021 ◽  
pp. 110073
Author(s):  
Xinfeng Li ◽  
Zheng Feng ◽  
Xiaolong Song ◽  
Yanfei Wang ◽  
Yong Zhang
Keyword(s):  
Hydrogen Embrittlement ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Hydrogen Charging ◽  
Charging Time

Effect of Hydrogen on Mechanical Properties of Type 310S Stainless Steel

2011 ◽  
Vol 488-489 ◽  
pp. 234-237
Author(s):  
Noriyuki Takano ◽  
Yutaka Kaidu
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Hydrogen Embrittlement ◽  
Side Surface ◽  
Hydrogen Charging ◽  
Micro Cracks ◽  
Reduction Of Area ◽  
Cathodic Charging

It is known that type 310S stainless steel is insensitive to hydrogen embrittlement. Then, the effect of hydrogen on the mechanical properties has not been studied in detail. In the present work, SSRT was carried out under hydrogen cathodic charging condition. Elongation increased by hydrogen charging, while reduction of area decreased. A lot of micro-cracks were observed on the side surface of fractured specimens into which hydrogen was charged, while no cracks were observed on the side surface of fractured specimens without hydrogen charging. Micro-cracks were also observed on the surface of unloaded specimens that were annealed after hydrogen charging. Therefore, it is considered that cracks occur from the defects induced by hydrogen charging.

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