Evolution of microstructure and mechanical properties during tempering of M50 steel with Bainite/Martensite duplex structure

Wang, Feng; Qian, Dongsheng; Mao, Huajie; He, Yuangeng; Shu, Benan

doi:10.1016/j.jmrt.2020.04.075

Cited by 41 publications

(8 citation statements)

References 35 publications

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“…Figure 13 illustrates the microstructure evolution at different preheating temperatures in a calculated time–temperature–transformation (TTT) diagram of M50 according to the data from. [ 28 ] Without powder bed preheating, the part temperature drops below the martensite start temperature during rapid cooling, and the martensitic transformation occurs in the process. Supersaturated austenite remains next to the transformed martensite.…”

Section: Discussionmentioning

confidence: 99%

Influence of Preheating Temperature on Microstructure Evolution and Hardness of High‐Speed Steel AISI M50 Processed by Laser Powder Bed Fusion

Qin

Saewe

Kunz

et al. 2023

steel research int.

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The laser powder bed fusion (LPBF) technology has been involved in the tooling industry to produce tools with complex geometry and integrated functions. However, tool steels with high carbon content tend to crack due to the thermal stresses during the LPBF process. One solution is increasing the powder bed temperature to avoid large thermal gradients. In the present study, the influence of the preheating temperature on microstructure and corresponding hardness is systematically investigated. With the help of time–temperature–transformation diagram, the phase evolution during the LPBF process is systematically explained. AISI M50 samples are produced by LPBF from room temperature to a preheating temperature of 650 °C. Higher preheating temperatures shift the optimal laser parameter window to lower volume energy densities. A cellular/dendritic microstructure formed during the rapid solidification with retained austenite is located at the interdendritic regions. Moreover, a high preheating temperature reduces the retained austenite fraction, specifically from 39% without preheating to 7.6% at 650 °C preheating temperature.

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Section: Discussionmentioning

confidence: 99%

Influence of Preheating Temperature on Microstructure Evolution and Hardness of High‐Speed Steel AISI M50 Processed by Laser Powder Bed Fusion

Qin

Saewe

Kunz

et al. 2023

steel research int.

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“…The heat treatment process of the samples is shown in Figure 1a. The M s is 160-190 °C and the bainite starting temperature is below 400 °C, [24,25] and the M s is varied during the heat treatment. The samples were placed in a high-temperature furnace and heated to 840, 1020, and 1090 °C, and the holding time was 30, 15, and 12 min, respectively, which were then kept in a salt bath at 200 °C for 2 h. The samples were taken out and cooled to room temperature, and then tempered at 500 °C for 2 h for 3 times.…”

Section: Methodsmentioning

confidence: 99%

Effect of Stabilization Treatment on Size and Properties of Austempered M50 Steel

Wei

Wang

et al. 2022

steel research int.

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“…Figure 6 shows metallographic microstructures of ductile cast iron tempered at different temperatures. Due to the high carbon content of DCI, the microstructure of DCI can be regarded as composed of high carbon steel and nodular graphite, and the microstructure evolution of the matrix at different tempering temperatures is similar to the martensitic steel [30]. At low temperatures of 150-250°C, few carbides precipitate from carbon-supersaturated martensite, the final microstructure consists of tempered martensite and nodular graphite, as shown in Figure 6(a).…”

Section: Effect Of Tempering Temperature On Microstructurementioning

confidence: 99%

Effect of tempering temperature on the wear behaviour of martensitic ductile iron

Jiaojiao

Chen

et al. 2023

Materials Science and Technology

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Ductile cast irons (DCIs) with different microstructures have been widely investigated and applied. The present work aims to illustrate the effect of different tempering temperatures (150–600°C) on the wear behaviour of martensitic ductile cast iron. The results indicate that the wear rate increases with tempering temperatures above 300°C. The lowest wear rate is found after tempering at 150–300°C, where the smearing of graphite forms a solid lubricating film and maybe an oxide layer on the wear surfaces during the sliding process. With further increases in the tempering temperature, the main wear mechanism changes from abrasive wear to adhesive wear. It shows that martensitic ductile cast iron can be used as a self-lubricated bearing material in the future.

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Evolution of microstructure and mechanical properties during tempering of M50 steel with Bainite/Martensite duplex structure

Cited by 41 publications

References 35 publications

Influence of Preheating Temperature on Microstructure Evolution and Hardness of High‐Speed Steel AISI M50 Processed by Laser Powder Bed Fusion

Influence of Preheating Temperature on Microstructure Evolution and Hardness of High‐Speed Steel AISI M50 Processed by Laser Powder Bed Fusion

Effect of Stabilization Treatment on Size and Properties of Austempered M50 Steel

Effect of tempering temperature on the wear behaviour of martensitic ductile iron

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