Results 21 to 30 of about 5,536 (261)

An understanding of hydrogen embrittlement in nickel grain boundaries from first principles

Materials & Design, 2021
Here, the segregation and accumulation of hydrogen in Ni grain boundaries, and its effects on cohesion and tensile mechanical strength were studied by means of density functional theory simulations. Three model grain boundaries were considered: the Σ3(11¯
Han Lin Mai, Xiang-Yuan Cui, Daniel Scheiber, Lorenz Romaner, Simon P. Ringer   +4 more
doaj   +1 more source

First-Principles Study of B Segregation at Austenite Grain Boundary and Its Effect on the Hardenability of Low-Alloy Steels

Metals, 2022
Addition of B is beneficial for the hardenability of low-alloy steels and the effect is further improved when combined with the addition of Mo. While experiments demonstrated that Mo reduces the M23(C,B)6 precipitation and indicated an interaction ...
Jingliang Wang, Xiang Yang, Rongtao Qian, Xuequan Rong, Zhenjia Xie, Chengjia Shang   +5 more
doaj   +1 more source

Surface Cracking in 05Cr17Ni4Cu4Nb Precipitation-Hardened Stainless Steel During Secondary Forging： Mechanisms and Solutions [PDF]

Teshugang
05Cr17Ni4Cu4Nb steel is a martensitic precipitation-hardened stainless steel that frequently exhibits surface cracking during secondary forging， significantly compromising forging efficiency and product yield.In this study， the original austenite ...
Zhao　Jiali, Xin　Ruishan, Yu　Zhanyang, Cao　Chenxing, Xue　Feng, He　Yudong, Zhou　Peng
doaj   +3 more sources

Effects of low-frequency magnetic field on grain boundary segregation in horizontal direct chill casting of 2024 aluminum alloy [PDF]

China Foundry, 2005
Effects of low frequency electromagnetic field on grain boundary segregation in horizontal direct chill (HDC)casting process was investigated experimentally.
Zhihao ZHAO, Jianzhong CUI, Jie DONG
doaj  

Atomistic Simulation Study of Grain Boundary Segregation and Grain Boundary Migration in Ni-Cr Alloys

Metals
Using Molecular Dynamics (MD) and Monte Carlo (MC) simulations, we studied the grain boundary (GB) segregation under different temperatures and Cr concentrations in Ni-Cr alloys with two distinct grain-boundary structures, i.e., Σ5(310)[010] and Σ101(200)
Pengwei Huang, Qixin Xiao, Wangyu Hu, Bowen Huang, Dingwang Yuan   +4 more
doaj   +1 more source

Interpretation of microstructure evolution and mechanical properties under aging treatments of a Fe–24Mn-0.6C–2Al-0.6V austenitic steel for cryogenic application

Journal of Materials Research and Technology, 2023
Aging treatment is an effective way of strengthening high-Mn strip steels based on automotive industry. However, the role of this method in enhancing yield strength and cryogenic toughness (−196 °C) of high-Mn steels has still unclear so far.
Jia-kuan Ren, Zhi-hong Li, Xin Zhou, Si-wei Wu, Jun Chen, Zhen-yu Liu   +5 more
doaj   +1 more source

Thermodynamic Pathways of Nonequilibrium Solidification in Wire‐Arc Additive Manufacturing Fe‐Based Multicomponent Alloy Structures

Advanced Engineering Materials, EarlyView.
Geometry‐driven thermal behavior in wire‐arc additive manufacturing (WAAM) influences microstructural evolution during nonequilibrium solidification of a chemically complex Fe–Cr–Nb–W–Mo–C nanocomposite system. By comparing different deposits configurations, distinct entropy–cooling rate correlations, segregation, and carbide evolution are revealed ...
Blanca Palacios, Anthony Gonzalez, Aleksander Aleman, Tyler Dolmetsch, Tanaji Paul, Arvind Agarwal   +5 more
wiley   +1 more source

Mo segregation-induced changes of grain boundary segregation, precipitation, and fracture behaviors in Fe–Mn–Ni–Mo maraging steel

Journal of Materials Research and Technology
The effects of Mo pre-segregation on the changes of the grain boundary segregation, precipitation, and fracture behaviors in Fe–Mn–Ni-based maraging steel were studied by microscopic observation and First-principles calculations.
Dong-Hyun Kim, Yoon-Uk Heo
doaj   +1 more source

Combined Process‐ and Phase‐Field‐Simulation to Predict the Microstructure of Single‐Crystal Ni‐Based Superalloys

Advanced Engineering Materials, EarlyView.
A combined finite element and phase‐field approach predicts the evolution of microstructure during the directional solidification of Ni‐based superalloys. The model reveals how withdrawal rate, temperature gradient, and wall thickness control the dendrite spacing, highlighting the strong effect of surface regions in thin sections where dendrite growth ...
Sean Böhm, André B. Baldissera, Rainer Völkl, Uwe Glatzel   +3 more
wiley   +1 more source

Modelling Hydrogen Embrittlement using Density Functional Theory: A theoretical approach to understanding environmentally assisted cracking in 7xxx series aluminium alloys [PDF]

MATEC Web of Conferences, 2020
The effects of H segregation to a Σ11 symmetric tilt Al grain boundary are investigated using atomistic simulations, as part of a wider study on cracking in 7xxx series alloys.
Wilson Benjamin T., Robson Joseph D., Race Christopher P.   +2 more
doaj   +1 more source