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Related Concept Videos

Mechanical Characteristics of Steel01:18

Mechanical Characteristics of Steel

747
The mechanical characteristics of steel are assessed through various tests that evaluate its strength, toughness, and flexibility. These tests include tension, torsion, impact, bending, and hardness assessments, each providing crucial information about steel's suitability for specific applications.
The tension test is fundamental for determining tensile strength. In this test, a steel specimen is stretched using a gripping device until it breaks. The data collected during this test are used...
747
Steel Manufacturing01:26

Steel Manufacturing

767
Steel manufacturing is a multi-stage process that begins by smelting iron ore into cast iron in a blast furnace. This initial stage involves layering iron ore with coke, a type of fuel, and crushed limestone within the furnace. The coke is ignited with a high volume of air, leading to the creation of carbon monoxide, which acts to reduce the iron ore to pure iron.
During this smelting process, limestone plays a crucial role by forming slag. Slag captures impurities within the molten iron, such...
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Ferromagnetism01:31

Ferromagnetism

2.4K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
2.4K
Properties of Transition Metals02:58

Properties of Transition Metals

26.9K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
26.9K
Types Of Superconductors01:28

Types Of Superconductors

1.1K
A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
1.1K
Alkali Metals03:06

Alkali Metals

19.8K
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
19.8K

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Low-energy Cathodoluminescence for OxyNitride Phosphors
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Low-oxygen rare earth steels.

Dianzhong Li1, Pei Wang2, Xing-Qiu Chen2

  • 1Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, P. R. China. dzli@imr.ac.cn.

Nature Materials
|September 8, 2022
PubMed
Summary
This summary is machine-generated.

Rare earth (RE) addition to steels significantly improves mechanical properties by addressing oxygen-based inclusions. A dual low-oxygen technology ensures stable RE effects, enhancing fatigue life and steel performance.

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Area of Science:

  • Materials Science
  • Metallurgy
  • Steel Engineering

Background:

  • Rare earth (RE) elements are added to steels to enhance properties, but their effects are inconsistent, hindering production and research.
  • Variable mechanical performance in RE steels is a long-standing challenge, limiting their widespread application and study.

Purpose of the Study:

  • To identify the root cause of performance variability in rare earth steels.
  • To develop a method for achieving stable and improved mechanical properties in rare earth steels through controlled oxygen levels.

Main Methods:

  • Investigated the correlation between oxygen content, inclusion formation, and mechanical properties in rare earth steels.
  • Proposed and implemented a dual low-oxygen technology, focusing on both steel melts and raw rare earth materials.
  • Evaluated the impact of rare earth addition under low-oxygen conditions on fatigue life and microstructural evolution.

Main Results:

  • Property variations in rare earth steels are attributed to oxygen-based inclusions.
  • The dual low-oxygen technology significantly stabilizes and enhances rare earth effects.
  • Parts-per-million level rare earth addition under low-oxygen conditions resulted in a 40-fold increase in tension-compression fatigue life and a 40% enhancement in rolling contact fatigue life.
  • Rare earth elements were observed to reduce carbon diffusion rates and retard ferrite nucleation at austenite grain boundaries.

Conclusions:

  • Controlling oxygen content in both steel melts and rare earth materials is crucial for realizing the full potential of rare earth additions.
  • The dual low-oxygen technology enables rare earth elements to effectively purify, modify, and micro-alloy steels, leading to superior performance.
  • This research overcomes a major bottleneck in rare earth steel production and utilization, paving the way for advanced steel applications.