Delayed Fracture of Nickel-Coated Ultrahigh Strength Maraging Steel in Hydrogen Gas

Hydrogen Embrittlement Behavior of a 1700 MPa-Class Ultrahigh Strength Steel Containing Hydrogen Traps

Eiji Akiyama , Songjie Li , Yuuji Kimura , Kaneaki Tsuzaki , Nobuyoshi Uno c a National Institute for Materials Science 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan b School of Materials Science and Engineering, University of Science and Technology Beijing, No. 30 Xueyuan Road, Hidian Zone, Beijing 100083, China c Nippon Steel and Sumikin Metal Products Co, Ltd, SA Bldg., 17-12 Kiba 2-chome, ...

Ultrahigh Strength Steel: Development of Mechanical Properties Through Controlled Cooling

Failure Investigation of Hydrogen Blistering on Low-strength Carbon Steel

The current study assesses the root causes of hydrogen blisters on low strength carbon steel equipment. For this purpose, some experiments including hardness test, non-destructive test (NDT), metallography, and fractograpghy are conducted. The microstructure of two blisters is assessed by means of optical microscopy and scanning electron microscopy (SEM). The microstructural studies show that t...

The Assessment of Second Pulse Effects on the Microstructure and Fracture Behavior of the Resistance Spot Welding in Advanced Ultrahigh-Strength Steel TRIP1100

In this study, the effects of the second pulse resistance spot welding on the microstructure and mechanical properties of TRIP1100 steel were evaluated. The thermal process after welding was designed to improve metallurgical properties with pulse currents of 6kA, 9kA and 12kA after initial welding with 10kA current. The effect of the second pulse on mechanical and microstructural properties was...

Strength and Toughness of Reinforced Concrete with Coated Steel Fibers

The effect of zinc phosphate (ZP) and zinc calcium phosphate (ZCP) coatings on the reinforcing mechanisms of smooth steel fiber in cementitious matrix have been studied. The results of pull out tests illustrated that by coating smooth steel fiber the pull-out load may be increased up to 100%. The effect of zinc phosphate coating on interface bonding was more than zinc-calcium phosphate coating....