Hydrogen embrittlement of ultra high strength 300 grade maraging steel

2015 ◽  
Vol 101 ◽  
pp. 12-18 ◽  
Author(s):  
L.P.M. Santos ◽  
M. Béreš ◽  
I.N. Bastos ◽  
S.S.M. Tavares ◽  
H.F.G. Abreu ◽  
...  
Keyword(s):  
Hydrogen Embrittlement ◽  
Maraging Steel ◽  
High Strength

scholarly journals Hydrogen Embrittlement of the Additively Manufactured High-Strength X3NiCoMoTi 18-9-5 Maraging Steel

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5073
Author(s):  
Angelina Strakosova ◽  
Michaela Roudnická ◽  
Ondřej Ekrt ◽  
Dalibor Vojtěch ◽  
Alena Michalcová
Keyword(s):  
Heat Treatment ◽  
Hydrogen Embrittlement ◽  
Maraging Steel ◽  
Tensile Testing ◽  
High Strength ◽  
Fracture Surface Morphology ◽  
Laser Melting ◽  
Heat Treated ◽  
Before And After ◽  
A Current

The main aim of this study was to determine the susceptibility of the additively manufactured high strength X3NiCoMoTi 18-9-5 maraging steel to hydrogen embrittlement. For this purpose, samples produced by selective laser melting technology, before and after heat treatment, were used. The examined samples were electrochemically charged with hydrogen in NaCl + NH4SCN solution at a current density of 50 mA/cm2 for 24 h. The H content increased from about 1 to 15 ppm. Heat treatment did not affect the amount of H trapped in the maraging steel. Tensile testing revealed that the tensile strength of the H-charged samples was much lower than that of the uncharged samples. Moreover, the material became brittle after charging compared to the ductile as-printed and heat-treated samples with elongation values of 7% and 2%, respectively. The loss of plasticity was confirmed by fractography, which revealed transformation of the fracture surface morphology from dimple-like in the as-produced state to a brittle one with smooth facets in the H-charged state.

Microstructure of resistance spot welding of maraging steels

1990 ◽  
Vol 48 (4) ◽  
pp. 900-901
Author(s):  
I. Neuman ◽  
S.F. Dirnfeld ◽  
I. Minkoff
Keyword(s):  
Maraging Steel ◽  
Spot Welding ◽  
Lath Martensite ◽  
Base Material ◽  
Aging Treatment ◽  
High Strength ◽  
Maraging Steels ◽  
Heat Treated ◽  
Current Cycle ◽  
Welding Processes

Experimental work on the spot welding of Maraging Steels revealed a surprisingly low level of strength - both in the as welded and in aged conditions. This appeared unusual since in the welding of these materials by other welding processes (TIG,MIG) the strength level is almost that of the base material. The maraging steel C250 investigated had the composition: 18wt%Ni, 8wt%Co, 5wt%Mo and additions of Al and Ti. It has a nominal tensile strength of 250 KSI. The heat treated structure of maraging steel is lath martensite the final high strength is reached by aging treatment at 485°C for 3-4 hours. During the aging process precipitation takes place of Ni3Mo and Ni3Ti and an ordered solid solution containing Co is formed.Three types of spot welding cycles were investigated: multi-pulse current cycle, bi-pulse cycle and single pulsle cycle. TIG welded samples were also tested for comparison.The microstructure investigations were carried out by SEM and EDS as well as by fractography. For multicycle spot welded maraging C250 (without aging), the dendrites start from the fusion line towards the nugget centre with an epitaxial growth region of various widths, as seen in Figure 1.

scholarly journals Effect of Strain Rate on the Hydrogen Embrittlement Property of Ultra High-strength Low-alloy TRIP-aided Steel

2019 ◽  
Vol 105 (4) ◽  
pp. 443-451 ◽  
Author(s):  
Tomohiko Hojo ◽  
Riko Kikuchi ◽  
Hiroyuki Waki ◽  
Fumihito Nishimura ◽  
Yuko Ukai ◽  
...  
Keyword(s):  
Hydrogen Embrittlement ◽  
Strain Rate ◽  
High Strength

Implementation of HSLA-100 Steel in Aircraft Carrier Construction—CVN 74

1995 ◽  
Vol 11 (02) ◽  
pp. 97-101
Author(s):  
J. P. Christein ◽  
J. L. Warren
Keyword(s):  
Hydrogen Embrittlement ◽  
High Strength ◽  
High Yield ◽  
Aircraft Carrier ◽  
Implementation Plan ◽  
New Material ◽  
Welding Procedure

High strength low alloy (HSLA)-100 steel was developed to be less sensitive to hydrogen embrittlement than high yield (HY)-100 steel. The primary benefits sought through the use of this new steel were savings in energy, labor, and scheduling that would result from reduced preheat for welding. This paper reviews the overall efforts required to implement the use of HSLA-100 steel during CVN 74 aircraft carrier construction. It discusses the engineering and design effort required to incorporate a new material on a vessel midway through construction. Also included is a discussion of the development of an implementation plan which ensures successful welding procedure qualification, production welding, and inspection of HSLA-100 welds. Results confirm that HSLA-100 steel can be successfully substituted for HV-100 steel in a shipyard environment, and that significant benefits can be realized from reduced welding preheat. Also, key elements of future applications of HSLA-100 are presented.

Precipitation of aluminum nitride in a high strength maraging steel with low nitrogen content

2014 ◽  
Vol 98 ◽  
pp. 193-201 ◽  
Author(s):  
G. Jeanmaire ◽  
M. Dehmas ◽  
A. Redjaïmia ◽  
S. Puech ◽  
G. Fribourg
Keyword(s):  
Aluminum Nitride ◽  
Nitrogen Content ◽  
Maraging Steel ◽  
High Strength ◽  
Low Nitrogen
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