Effect of deep cryogenic treatment parameters on martensite multi-level microstructures and properties in a lath martensite/ferrite dual-phase steel

Fan, Shichao; Hai, Hong; Li, Meng; Zhang, Xingguo

doi:10.1016/j.msea.2021.141022

Cited by 23 publications

(24 citation statements)

References 26 publications

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“…It is reported that prior austenite grains, martensite packet and martensite block are high‐angle grain boundaries (HAGBs) with a misorientation higher than 15°, while martensite lath is low angle grain boundaries (LAGBs) less than 15°. [ 22,23 ] Figure 3e is the misorientation angle of the yellow line part in Figure 3c. It can be observed that the misorientation of packet boundary is around 40°–50°, while the block boundary is around 60°.…”

Section: Resultsmentioning

confidence: 99%

“…It is well known that prior austenite grains are divided into several packets, [21] and there is a linear relationship between packet size, block width, and prior austenite grain size. [22] As prior austenite grain size is only related to the austenitizing temperature, [23] the size of packets and blocks in this study changes little.…”

Section: Microstructurementioning

confidence: 89%

“…It is reported that the interface binding forces of LAGBs is strong and is not easy to cause stress concentration. [ 23 ] Carbides and matrix with LAGBs are hardly to generate cracks, which will reduce the decohesion of carbides and the spalling of the matrix. Thus, the decrease of LAGBs results in the decrease of wear performance.…”

Section: Discussionmentioning

confidence: 99%

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Influence of Tempering Temperature on the Microstructure and Wear Properties of Powder Metallurgy High‐Speed Steels

Lyu

Yao

Zhang

et al. 2022

steel research int.

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The influence of tempering temperature on the microstructure of powder metallurgy high-speed steels (PM HSSs) PM20 is investigated by X-ray diffraction, electron backscattering diffraction, and transmission electron microscopy. With the increasing of tempering temperature, the ratio of low angle grain boundaries decreases, while the volume fraction and size of M 6 C and VC carbides increase. The wear resistance of PM20 with different tempering temperatures is studied by reciprocating ball-on-flat methods. The wear properties of PM20 decrease gradually with the increasing of tempering temperature. The variation of wear properties is explained by the characteristic of the martensite matrix, carbides, and the misorientation angle of boundaries. All samples present a complex wear mechanism of abrasive wear and oxidation wear.

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Section: Resultsmentioning

confidence: 99%

Section: Microstructurementioning

confidence: 89%

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Influence of Tempering Temperature on the Microstructure and Wear Properties of Powder Metallurgy High‐Speed Steels

Lyu

Yao

Zhang

et al. 2022

steel research int.

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“…As is well known, the matrix of HSS is martensite (M), which plays an important role in the mechanical properties of steel [ 21 , 22 ]. Martensite microstructures can be described via the descending levels of prior austenite grain (PAG), martensitic packet (MP), martensitic block (MB), and martensitic lath (ML) [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

“…Martensite microstructures can be described via the descending levels of prior austenite grain (PAG), martensitic packet (MP), martensitic block (MB), and martensitic lath (ML) [ 23 ]. Each PAG is divided into several packets and the packet is then subdivided into the block with the same orientation; one block is composed of several laths [ 22 ]. Previous research has indicated that the toughness of the steel is enhanced with the decrease in the packet and block size under the conditions of the same prior austenite grain size [ 24 , 25 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Deep Cryogenic Time on Martensite Multi-Level Microstructures and Mechanical Properties in AISI M35 High-Speed Steel

Huang

Feng

et al. 2022

Materials

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High-speed steel is widely used for cutting tools due to its convenience of preparation and cost-effectiveness. Previous research has shown that deep cryogenic treatments improve the mechanical properties of high-speed steel, due to the transformation of the residual austenite and the precipitation of carbide, while few studies have researched martensitic changes. The variations in martensite multi-level microstructures in AISI M35 high-speed steel, treated over different deep cryogenic time periods, were investigated in this study. Meanwhile, the effect of these variations on the mechanical properties of the selected steel was discussed. It was found that prolonging deep cryogenic time facilitated an increase in dislocation, low-angle grain boundary, and the coincident-site lattice boundary (especially the twin boundary) of martensite. The size of the martensite block (db) and lath (dl) decreased with deep cryogenic time. However, the effect on the microstructure was limited when the cryogenic treatment time exceeded 5 h. The increase in dislocation decreased the temperature for carbide precipitation and promoted fine carbide precipitation during tempering. The refinement of martensite multi-level microstructures and the greater precipitation of fine carbides gave the tempered specimens excellent impact toughness. The impact toughness of the tempered samples undergoing deep cryogenic treatment for more than 5 h was about 32% higher than the sample without deep cryogenic treatment.

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Effect of Nano‐TiC Ceramic Particles on Microstructures and Properties of High‐Cr Steel under Different Heat‐Treatment Conditions

Chang

Shu

et al. 2023

Adv Eng Mater

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In order to improve the service life of die steels, many methods have been used to improve their properties. However, some properties may be weakened after different heat treatments. In this study, a novel method of nanoparticle treatment was used to improve the service performance of high Cr steel, and the effect of nano‐TiC ceramic particles on its microstructures and properties under different heat treatment conditions was investigated. After forging and isothermal spheroidization, the nano‐TiC ceramic particles treatment high Cr steel has a mixed grain with equiaxed grain and striated grain. Under different heat treatment conditions, the nano‐TiC reinforced high Cr steel has refined martensite laths, carbides, and a higher content of retained austenite. In contrast, the nano‐TiC ceramic particles reinforced high Cr steel have higher strength and strain, the yield strength (σ0.2), tensile strength (σb), fracture strain, product of strength and strain, and impact toughness of HCS‐51 (HCSN‐51), are 1349 MPa (1531 MPa), 1662 MPa (1770 MPa), 9.4% (12.1%), 12405 MPa·% (18766 MPa·%) and 266 J/cm2 (445 J/cm2), which is 13.5%, 6.5%, 28.7%, 51.3% and 67.3% higher, respectively. The primary strengthening mechanisms included fine‐grain strengthening and precipitation strengthening. The main toughness mechanism was fine‐grain and transformation‐induced plasticity.This article is protected by copyright. All rights reserved.

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Effect of deep cryogenic treatment parameters on martensite multi-level microstructures and properties in a lath martensite/ferrite dual-phase steel

Cited by 23 publications

References 26 publications

Influence of Tempering Temperature on the Microstructure and Wear Properties of Powder Metallurgy High‐Speed Steels

Influence of Tempering Temperature on the Microstructure and Wear Properties of Powder Metallurgy High‐Speed Steels

Effect of Deep Cryogenic Time on Martensite Multi-Level Microstructures and Mechanical Properties in AISI M35 High-Speed Steel

Effect of Nano‐TiC Ceramic Particles on Microstructures and Properties of High‐Cr Steel under Different Heat‐Treatment Conditions

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