scholarly journals Dislocation spreading and ductile–to-brittle transition in post-irradiated ferritic grains: Investigation of grain size and grain orientation effect by means of 3D dislocation dynamics simulations

2019 ◽  
Vol 34 (9) ◽  
pp. 1584-1594
Author(s):  
Yang Li ◽  
Christian Robertson ◽  
Xianfeng Ma ◽  
Biao Wang
Keyword(s):  
Grain Size ◽  
Grain Orientation ◽  
Dislocation Dynamics ◽  
Orientation Effect ◽  
Brittle Transition ◽  
Ductile To Brittle Transition ◽  
Dynamics Simulations ◽  
Image Position

Abstract

Is There a Critical Size in Nano Grained Metals for Ductile to Brittle Transition?

2004 ◽  
Author(s):  
Aman Haque ◽  
Taher Saif
Keyword(s):  
Grain Size ◽  
Grain Boundary ◽  
Critical Size ◽  
Volume Ratio ◽  
Metal Films ◽  
Metal Structures ◽  
Brittle Transition ◽  
Ductile To Brittle Transition ◽  
Metal Properties

Nanoscale metal films and electrodes are extensively used in today’s micro and nano electronics as well as nano mechanical systems. These metal structures are usually polycrystalline in nature with nano scale grains connected to each other by grain boundaries. The small size offers large grain boundary to volume ratio that is likely to affect the metal properties significantly. Here, we discuss the role of grain size and boundaries in determining the mechanical behavior of metals, such as elasticity and yielding.

The Effect of Intermetallic Phases on Ductile to Brittle Transition of Aluminium-Iron Alloy

2014 ◽  
Vol 592-594 ◽  
pp. 770-775
Author(s):  
Shahrukh Shamim ◽  
Gaurav Sharma ◽  
Chandrabalan Sasikumar
Keyword(s):  
Fracture Toughness ◽  
Grain Size ◽  
Transition Temperature ◽  
Research Work ◽  
Iron Alloy ◽  
Energy Transition ◽  
Intermetallic Phases ◽  
Impact Testing ◽  
Brittle Transition ◽  
Ductile To Brittle Transition

The effect of intermetallic phases and grain size on ductile to brittle transition temperature of Aluminium-Iron alloy (Al–11% Fe) was investigated in this research work. An Izod impact testing method was adopted to study the DBTT in the temperature interval of 77 K to 373 K. The ductile-brittle transition points: fracture transition plastic (FTP), fracture-appearance transition temperature (FATT), impact energy transition temperature (IETT), fractional surface area of cleavage (brittle) and fibrous (ductile) fractures and grain size of the samples were also determined. The fracture toughness of Al-Fe alloy found decreasing with temperature in contrast to conventional materials. The fractographic investigation revealed that the microstructural changes play a major role in determining the fracture toughness of these alloys. Annealing of these samples slightly improved the fracture toughness as the spherical morphology of intermetallic particles resists the crack propagation.

The Effects of Grain Size on the Flow and Fracture of Long-Range Ordered Alloys

1984 ◽  
Vol 39 ◽  
Author(s):  
Erland M. Schulson
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Grain Refinement ◽  
Low Temperatures ◽  
Ferritic Steels ◽  
Brittle Transition ◽  
Ordered Alloys ◽  
Brittle Transition Temperature ◽  
Ductile To Brittle Transition ◽  
Grain Refinement Strengthening

Three points usually come to mind when considering the effects of grain size on the mechanical properties of polycrystals: strengthening at low temperatures through grain refinement, strengthening at high temperatures through grain coarsening, and lowering of the ductile to brittle transition temperature in materials such as ferritic steels and zinc through grain refinement. Ordered alloys, as we shall see, exhibit the same effects.

scholarly journals Ductile-to-Brittle Transition and Brittle Fracture Stress of Ultrafine-Grained Low-Carbon Steel

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1634
Author(s):  
Tadanobu Inoue ◽  
Hai Qiu ◽  
Rintaro Ueji ◽  
Yuuji Kimura
Keyword(s):  
Grain Size ◽  
Carbon Steel ◽  
Brittle Fracture ◽  
Fracture Stress ◽  
Low Carbon Steel ◽  
Carbon Steels ◽  
Low Carbon ◽  
Brittle Transition ◽  
Wide Range ◽  
Ductile To Brittle Transition

Ductile-to-brittle transition (DBT) temperature and brittle fracture stress, σF, are important toughness criteria for structural materials. In this paper, low-carbon steels with an ultrafine elongated grain (UFEG) structure (transverse grain size 1.2 μm) and with two ferrite (α)- -pearlite structure with grain sizes 10 µm and 18 µm were prepared. The UFEG steel was fabricated using multipass warm biaxial rolling. The tensile tests with a cylindrical specimen and three-point bending tests with a single-edge-notched specimen were performed at −196 °C. The local stress near the notch was quantitatively calculated via finite element analysis (FEA). The σF for each sample was quantified based on the experimental results and FEA. The relationship between σF and dα in the wide range of 1.0 μm to 138 μm was plotted, including data from past literature. Finally, the conditions of grain size and temperature that cause DBT fracture in low-carbon steel were shown via the stress−d−1/2 map. The results quantitatively showed the superiority of α grain size for brittle fracture.

Sign in / Sign up

Export Citation Format

Share Document