Versprödung von gehärteten Stählen beim Anlassen auf 250 bis 400°

Schrader, Hans; Wiester, Hans-Joachim; Siepmann, Heinrich

doi:10.1002/srin.195000371

Cited by 9 publications

(2 citation statements)

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“…The embrittlement can be prevented in steels with lower manganese concentration by the addition of 0.1 wt% aluminum. [ 41 ] The observed Charpy impact energies (Table 3) demonstrate the addition of aluminum is as effective for alloys with an increased manganese concentration as in classic Q + T steels.…”

Section: Discussionmentioning

confidence: 98%

“…Alloy +Al showed this behavior after tempering at 450 °C, which can be explained by the addition of aluminum, as aluminum retards the carbide growth and prevents the 350 °C embrittlement. [ 41 ] If the other alloys are tempered at 450 °C, nearly all mechanical properties decrease while the ductility increases, which is caused by further carbide coarsening and additional relaxation of the martensitic matrix. The effect of intercritical annealing on the mechanical properties strongly depends on the applied temperatures during the heat treatment.…”

Section: Discussionmentioning

confidence: 99%

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Tempering and Intercritical Annealing of Air‐Hardening 4 wt% Medium Manganese Steels

Gramlich

Bleck

2021

steel research int.

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The mechanical properties after tempering and intercritical annealing of medium manganese steels with 4 wt% Mn for forging applications are presented. After forging with subsequent air cooling, heat treatments were performed, specifically tempering from 250 and 450 °C and intercritical annealing between 600 and 675 °C. Tensile properties, Charpy V‐notch impact toughness, and hardness were determined and compared with microstructural features characterized by metallography and synchrotron measurements, leading to the classification of six different heat treatment stages for medium manganese steels. Furthermore, the effects of different alloying additions (boron 0.0016–0.0057 wt%, molybdenum 0.2 wt%, and aluminum 0.5 wt%) are discussed with respect to the mechanical properties. It is shown that boron increases the impact toughness more effectively in the tempering regime, while the molybdenum alloyed samples exhibit higher toughness after intercritical annealing. Most of the materials and heat treatment states follow the inverse relationship between toughness and strength, while the aluminum alloyed samples show a superior toughness after tempering.

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Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

Tempering and Intercritical Annealing of Air‐Hardening 4 wt% Medium Manganese Steels

Gramlich

Bleck

2021

steel research int.

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Effect of molybdenum on tempered martensite embrittlement of medium carbon Si‐Mn steels

Fu¹,

Yaojian²

1989

Steel Research

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This paper reports a study of the effects of molybdenum on tempered martensite embrittlement (TME) of medium carbon Si‐Mn steels. The study employed standard U‐notch impact tests, scanning electron fractography, transmission electron microscopy, Auger electron spectroscopy, and dilatometric measurements. It is shown that the addition of molybdenum to Si‐Mn steels does not eliminate TME, but molybdenum acts to decrease the ductile‐brittle transition temperature (DBTT), thus making the impact test temperature for revealing TME lowered. Furthermore, the deferring role of molybdenum on TME is observed. In the molybdenum doped steels the TME embrittlement trough is displaced to a higher tempering temperature. The embrittlement is found to be concurrent with the replacement of ∊‐carbide by cementite during tempering. In the molybdenum doped steels the displacement of TME to a higher tempering temperature is seen to be associated with the role of molybdenum retarding cementite precipitation.

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Influence of Aluminum on Microstructure and Mechanical Properties of Air‐Hardened Medium Manganese Steel

Ridlo,

Zhang,

Akkus

et al. 2024

steel research int.

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The influence of different aluminum concentrations (0 and 0.25 wt%) on the mechanical properties and the microstructure of recently developed air‐hardening ductile forging steels with 4 wt% manganese is presented together with the effects of additional heat treatments after air cooling. Based on the achieved mechanical properties, the necessity of aluminum alloying is evaluated due to the processing challenges associated with the Fe–Mn–Al–Si system. For this matter, tensile properties, hardness, and Charpy impact toughness areevaluated with respect to microstructural features characterized by light optical microscopy and scanning electron microscopy equipped with electron backscatter diffraction (EBSD). It is demonstrated that the intermediate addition is not sufficient to reach the target values for the impact toughness, which demonstrates the importance of the addition to this steel grade. Additionally, insights on the tempering embrittlement are gained, as it can be shown that 0.25 wt% Al is sufficient to shift the tempering embrittlement from 300 to 350 °C. Finally, potential intercritical annealing temperatures can be specified: while high balances of strength and ductility can be reported at 650 and 675 °C, an exceeding of this temperature leads to insufficient austenite stabilization and consecutively martensite formation during cooling , as demonstrated by EBSD and X‐ray diffraction.

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Versprödung von gehärteten Stählen beim Anlassen auf 250 bis 400°

Cited by 9 publications

References 0 publications

Tempering and Intercritical Annealing of Air‐Hardening 4 wt% Medium Manganese Steels

Tempering and Intercritical Annealing of Air‐Hardening 4 wt% Medium Manganese Steels

Effect of molybdenum on tempered martensite embrittlement of medium carbon Si‐Mn steels

Influence of Aluminum on Microstructure and Mechanical Properties of Air‐Hardened Medium Manganese Steel

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