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Article
Open AccessUltrastrong and ductile steel welds achieved by fine interlocking microstructures with film-like retained austenite
The degradation of mechanical properties caused by grain coarsening or the formation of brittle phases during welding reduces the longevity of products. Here, we report advances in the weld quality of ultra-hi...
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Article
Hydrogen Trap** Characteristics and Mechanical Degradation in a Duplex Stainless Steel
We investigated the hydrogen behaviors and corresponding mechanical degradation in the duplex stainless steel under the ex-situ and in-situ cathodic charging condition. In the ex-situ condition, where the hydr...
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Article
Prediction of Retained Austenite Fraction in Quenching-and-Partitioning (Q&P) Steels Using the Gibbs Energy Balance Approach
Prediction of retained austenite fraction is quite important in designing advanced high strength steels since retained austenite is the source of transformation-induced plasticity. The present study investigat...
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Article
Influence of Microstructure Constituents on the Hydrogen‐Induced Mechanical Degradation in Ultra‐High Strength Sheet Steels
We investigate the influence of constituent phases on the hydrogen-induced mechanical degradation in two ultra-high strength sheet steels. In the complex phase (CP) steel, of which microstructure can be regard...
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Article
Hydrogen Behavior in Ti-Added Reduced Activation Ferritic-Martensitic Steels
Hydrogen behavior and corresponding mechanical degradation were examined in TaTi-RAFM and EUROFER97 steels. Increased Ta content with Ti addition decelerates the hydrogen diffusion but increases the solubility...
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Article
Open AccessA new class of lightweight, stainless steels with ultra-high strength and large ductility
Steel is the global backbone material of industrialized societies, with more than 1.8 billion tons produced per year. However, steel-containing structures decay due to corrosion, destroying annually 3.4% (2.5 ...
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Article
Hardness and Transverse Rupture Strength of TiC-Reinforced SKD11 Steel Matrix Composite
We investigate the effect of heat treatment on the hardness and transverse rupture strength (TRS) in the particulate TiC-reinforced SKD11 steel matrix composites, fabricated by a pressure infiltration casting ...
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Article
Effect of Prior Austenite Grain Size on Hole Expansion Ratio of Quenching and Partitioning Processed Medium-Mn Steel
The effect of the prior austenite grain size (PAGS) on the tensile properties and hole expansion ratio (HER) has been investigated. Starting from different PAGS values (4.7 μm and 15.2 μm) obtained by controlling...
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Article
Influence of Initial Pearlite Morphology on the Microstructure Evolution During Heat Treatment of 1.0C–1.5Cr Steel
Effect of initial pearlite morphology on the microstructure evolution during spheroidization annealing and subsequent hardening treatment was studied in hot-rolled 1.0C–1.5Cr bearing steel. The ferrite-to-aust...
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Article
Microstructure and Mechanical Properties of Austempered Medium-Carbon Spring Steel
Changes in microstructure and mechanical properties of medium-carbon spring steel during austempering were investigated. After austempering for 1 h at 290 °C or 330 °C, the bainite transformation stabilized au...
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Article
Effects of Molybdenum Addition on Hydrogen Desorption of TiC Precipitation-Hardened Steel
The hydrogen-trap states in TiC and MoC that have coherent interfaces with ferrite were investigated using first-principles calculation. The trap** sites of TiC were the interfaces and interstitial sites of ...
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Article
Tempering Behavior of TiC-Reinforced SKD11 Steel Matrix Composite
TiC-reinforced SKD11 steel matrix composite, fabricated by a pressure infiltration casting, undergoes monotonic decrease in hardness as tempering temperature increases. Element map**s by TEM–EDS and thermody...
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Article
Design of Online Spheroidization Process for 1.0C-1.5Cr Bearing Steel and Microstructure Analysis
Using thermo-mechanical control process, the online spheroidization annealing process of 1.0C-1.5Cr bearing steel was designed. Apart from intercritical online spheroidization (IS), a novel subcritical online ...
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Article
Hydrogen Permeation in Cold-Rolled High-Mn Twinning-Induced Plasticity Steels
Hydrogen permeation is investigated in cold-rolled Fe-0.6C-18Mn-(1.5Al) alloys. The hydrogen mobility is lower in cold-rolled alloys compared with annealed alloys. Al-containing alloy shows less deceleration ...
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Article
Influence of Heating Rate on Annealing and Reverse Transformation Behavior of TRIP Steels Having Martensite as Starting Microstructure
The influence of heating rate on the annealing and transformation behavior is investigated in TRIP steel having martensite as the starting microstructure. A higher heating rate preserves the hierarchical struc...
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Article
Influence of the Initial Microstructure on the Heat Treatment Response and Tensile Properties of TRIP-Assisted Steel
Microstructure evolution and mechanical properties were investigated in transformation-induced plasticity (TRIP) steel having a different initial microstructure. Compared with the cold-rolled structure that ev...
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Article
Influence of the Initial Microstructure on the Reverse Transformation Kinetics and Microstructural Evolution in Transformation-Induced Plasticity–Assisted Steel
The reverse transformation behavior upon heating to intercritical temperature was studied in Fe-0.21C-2.2Mn-1.5Si (wt pct) alloy with three initial microstructures. One is the cold-rolled (CR) structure and t...
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Article
Heat treatment response of TiC-reinforced steel matrix composite
A particulate TiC-reinforced SKD11 steel matrix composite is fabricated by using a pressure infiltration casting, achieving a homogeneous distribution of the particles with 60 vol%. The retained austenite frac...
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Article
Erratum to: Surface Selective Oxidation of Sn-Added CMnSi TRIP Steel
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Article
Surface Selective Oxidation of Sn-Added CMnSi TRIP Steel
The influence of the addition of Sn on the selective oxidation and the reactive wetting of CMnSi transformation-induced plasticity (TRIP) steels was studied by means of galvanizing simulator tests. A reference...
