Anregung der Zwischenstufen‐Umwandlung des Stahles durch kleine Mengen von α‐Eisen

Jellinghaus, Werner

doi:10.1002/srin.195200972

Cited by 15 publications

(4 citation statements)

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“…Quenching from 900 °C is more favorable than quenching from 1000 °C because it provides slightly higher abrasive wear resistance [ 29 ] and accelerates bainite transformation at 250 °C [ 28 ]. The acceleration of bainite transformation is caused by pre-existing martensite [ 33 , 34 , 35 ] which is present in the microstructure after quenching from 900 °C (see Figure 2 b).…”

Section: Resultsmentioning

confidence: 99%

Microstructure and Properties of Heat Affected Zone in High-Carbon Steel after Welding with Fast Cooling in Water

et al. 2020

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The purpose of the research was to obtain an arc welded joint of a preliminary quenched high-carbon wear resistant steel without losing the structure that is previously obtained by heat treatment. 120Mn3Si2 steel was chosen for experiments due to its good resistance to mechanical wear. The fast cooling of welding joints in water was carried out right after welding. The major conclusion is that the soft austenitic layer appears in the vicinity of the fusion line as a result of the fast cooling of the welding joint. The microstructure of the heat affected zone of quenched 120Mn3Si2 steel after welding with rapid cooling in water consists of several subzones. The first one is a purely austenitic subzone, followed by austenite + martensite microstructure, and finally, an almost fully martensitic subzone. The rest of the heat affected zone is tempered material that is heated during welding below A1 critical temperature. ISO 4136 tensile tests were carried out for the welded joints of 120Mn3Si2 steel and 09Mn2Si low carbon steel (ASTM A516, DIN13Mn6 equivalent) after welding with fast cooling in water. The tests showed that welded joints are stronger than the quenched 120Mn3Si2 steel itself. The results of work can be used in industries where the severe mechanical wear of machine parts is a challenge.

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Section: Resultsmentioning

confidence: 99%

Microstructure and Properties of Heat Affected Zone in High-Carbon Steel after Welding with Fast Cooling in Water

et al. 2020

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“…It is remarkable that the increase of the lattice parameter is disproportionate to thermic dilatation. In different literature sources is presented that the residual austenite additionally dissolves interstitial carbon during heating [24,25,[27][28][29][30][31]. Deviant effects are not discussed.…”

Section: Residual Austenitementioning

confidence: 99%

In‐situ Investigation during Tempering of a High Speed Steel with X‐ray Diffraction

Wießner¹,

Kleber²,

Kulmburg³

2005

Part & Part Syst Charact

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The combined use of a X-ray diffractometer and a high temperature chamber allows in-situ determination of microstructure during heat treatment. X-ray diffractograms are recorded during tempering of high speed steels. The Rietveld method is used in connection with size-strain analysis. Lattice parameters of austenite and martensite are utilized for estimating the change of car-bon content that has massive influence on the secondary hardening. Nevertheless, it was shown that the heat treatment of deep-frozen high speed steel cannot be deduced a priori from the applied tempering process under conventional quenching conditions. The differently conditioned microstructures are based on different phase amounts and microstrain-situations.

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“…In order to accelerate the bainite transformation, it is necessary to quench 120Mn3Si2 steel from such a temperature that after cooling, martensite was present in the structure in small amount. Martensite acts as a catalyst for bainite transformation [17], which begins less than in 1 hour if the steel 120Mn3Si2 is hardened from 900 o C [18]. Welding of previously quenched 120Mn3Si2 steel may be needed for large-part manufacturing.…”

Section: Literature Reviewmentioning

confidence: 99%

High-carbon steel: microstructure and abrasive wear resistance of heat affected zone after welding with fast cooling

Брыков

Ефременко

Osipov

et al. 2021

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The goal of this work is to estimate the abrasive wear resistance of heat affected zone (HAZ) after welding high-carbon low-alloy steel 120Mn3Si2 with fast cooling. The following benchmark data were used: microstructures of HAZ of 120Mn3Si2 steel after welding with cooling in water; abrasive wear resistance of different microstructure constituents of 120Mn3Si2 steel in two-body abrasive wear conditions. It is shown that high abrasive wear resistance of material in HAZ is provided in the vicinity of fusion line. The reason is unstable retained austenite which appears in HAZ as a result of quenching at fast cooling right after welding. The wear resistance of material in HAZ is altered by microstructural changes from austenite to austenite+martensite and finally martensite. The martensitic zone is about 0.5 mm wide and it is followed by zone of tempering of initial structure of steel. Zone of tempering is 1.5-2.0 mm wide and is the only zone of low abrasive wear resistance in HAZ of 120Mn3Si2 steel welded with fast cooling. Welding of 120Mn3Si2 steel with fast cooling in water results in welding joints which have as high wear resistant as the base material or even higher. This enables manufacturing flat welded elements with high wear-resistance and large surface area

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Anregung der Zwischenstufen‐Umwandlung des Stahles durch kleine Mengen von α‐Eisen

Cited by 15 publications

References 0 publications

Microstructure and Properties of Heat Affected Zone in High-Carbon Steel after Welding with Fast Cooling in Water

Microstructure and Properties of Heat Affected Zone in High-Carbon Steel after Welding with Fast Cooling in Water

In‐situ Investigation during Tempering of a High Speed Steel with X‐ray Diffraction

High-carbon steel: microstructure and abrasive wear resistance of heat affected zone after welding with fast cooling

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