Effect of Prior Austenite Grain Size on the Morphology and Mechanical Properties of Martensite in Medium Carbon Steel

Prawoto, Yunan; Jasmawati, Noor; Sumeru, Kasni

doi:10.1016/s1005-0302(12)60083-8

Cited by 92 publications

(47 citation statements)

References 17 publications

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“…In the case of crystalline bodies, such defects will be dislocations and the grain boundaries [5]. As shown in [3], the density of dislocations is higher in the case of steel with a finer grain.…”

Section: Fracture Analysismentioning

confidence: 99%

“…For example, at room temperature, the hardness, yield strength, tensile strength, fatigue strength, and impact strength all increase with decreasing grain size. The influence of grain size on the mechanical properties of steel is most commonly expressed in a Hall-Petch Equation (Equations (1) and (2)) [1][2][3][4]. This classic equation can also be used to predict hardness.…”

Section: Introductionmentioning

confidence: 99%

“…Some studies concerning the influence of the prior austenite grain size on the austenite to ferrite transformation temperature and different ferrite morphologies in Nb-micro-alloyed (HSLA) steel have been performed [6]. Similar studies have been performed to investigate the impact of the prior austenite grain size on the morphology and mechanical properties of martensite in medium carbon steel [3] and to predict the austenite grain growth in low-alloy steels [7], but there is still a lack of knowledge about the influence of the prior austenite grain size on the basic mechanical properties in low-alloy boron steels with high resistance to abrasive wear.…”

Section: Introductionmentioning

confidence: 99%

“…From the data contained in the works [1][2][3], decrease in the grain size of the primary austenite (and thus the reduction of the martensite packets sizes) from 200 µm to 5 µm results in an increase in strength of 235 MPa and an eight-fold increase in steel impact resistance. In relation to the above, in the opinion of the authors of this work, it is worth analyzing the morphology and size of the packets of martensitic structure while considering the impact of the grain size of the prior austenite on the selected mechanical properties of low-alloy steels with boron.…”

Section: Introductionmentioning

confidence: 99%

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The Influence of Austenite Grain Size on the Mechanical Properties of Low-Alloy Steel with Boron

Białobrzeska

Konat

Jasiński

2017

Metals

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This study forms part of the current research on modern steel groups with higher resistance to abrasive wear. In order to reduce the intensity of wear processes, and also to minimize their impact, the immediate priority seems to be a search for a correlation between the chemical composition and structure of these materials and their properties. In this paper, the correlation between prior austenite grain size, martensite packets and the mechanical properties were researched. The growth of austenite grains is an important factor in the analysis of the microstructure, as the grain size has an effect on the kinetics of phase transformation. The microstructure, however, is closely related to the mechanical properties of the material such as yield strength, tensile strength, elongation and impact strength, as well as morphology of occurred fracture. During the study, the mechanical properties were tested and a tendency to brittle fracture was analysed. The studies show big differences of the analysed parameters depending on the applied heat treatment, which should provide guidance to users to specific applications of this type of steel.

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Section: Fracture Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The Influence of Austenite Grain Size on the Mechanical Properties of Low-Alloy Steel with Boron

Białobrzeska

Konat

Jasiński

2017

Metals

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“…Along with the cooling rate controlled by the clay coating, the heating temperature is one of the key parameter, which mainly affects the evolution of prioraustenite microstructure (PAM). The latter has been reported to have a significant contribution to the strength and toughness of lath martensite [4][5][6], which is the final microstructure at the cutting edge of the sword [7][8]. Despite of its importance, there has not been any scientific study on the heating temperature and its effect on microstructure of Japanese sword.…”

Section: Introductionmentioning

confidence: 99%

A novel approach to study the effect of heating temperature on prior-austenite microstructure of a Japanese sword

Pham

Ohba

Morito

et al. 2015

MATEC Web of Conferences

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Abstract. There is uncertainty about heating temperature of final heat treatment and its effect on microstructure of Japanese sword, since the temperature is controlled entirely by experiences and skills of the swordsmith. This study proposed a novel approach to clarify how heating temperature affects prior-austenite microstructure of a Japanese sword. A fragment of the sword was normalized at 800 o C to recover its initial microstructure. Specimens were cut and quenched, after being reheated at temperatures from 740 to 860 o C with increment step of 20 o C. Their prior-austenite microstructure was reconstructed from martensite by using our newly developed automatic reconstruction method. In normalized microstructure of the sword, coarse pearlite islands of 0.70-0.76 mass% C steel were found within a fine ferrite-pearlite matrix of 0.52-0.56 mass% C steel. The prior-austenite grains of the medium C matrix remained fine (11.6 -15.1 μm) over the temperature range, while abnormal coarse grains (73.9 -123.7 μm) developed from high C islands in the specimens reheated above 780 o C. The prior-austenite microstructure of the original sword was closely similar to that of the specimen reheated at 760 o C. It was able to estimate the heating temperature of the original sword to be approximately 760 ± 10 o C.

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Effects of Nb and Tempering Time on Carbide Precipitation Behavior and Mechanical Properties of Cr–Mo–V Steel for Brake Discs

Wang

Cheng

et al. 2018

steel research int.

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To improve the performance of the steel for brake discs, like mechanical properties and thermal fatigue resistance, Nb is added to the steel. In this paper, the effects of Nb and tempering time on the microstructure and mechanical properties of the steel have been studied. The investigation of precipitation behaviors is based on Thermo‐Calc software and transmission electron microscopy. The results show there is a negative linear relationship between the yield strength and the logarithm of time, and tempering time should not exceed 2 h. V‐rich M8C7 and NbC occur during austenitizing, while (Mo,V)C, M23C6, and M7C3 precipitate during tempering. (Mo,V)C has a strong strengthening effect at the early stage of tempering, but it grows faster than M8C7. With 0.025% Nb addition, the yield strength and impact energy increase simultaneously due to the refinement of martensite; the addition of 0.045% Nb promotes the tempering stability due to the suppression of precipitation and coarsening of Cr carbides and the precipitation strengthening of M8C7 and NbC, therefore, the addition of 0.025–0.045% Nb is conducive to improving the performance of the steel. Moreover, the suppression of Cr carbides with 0.045% Nb addition makes up for the damage of large NbC to toughness.

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Effect of Prior Austenite Grain Size on the Morphology and Mechanical Properties of Martensite in Medium Carbon Steel

Cited by 92 publications

References 17 publications

The Influence of Austenite Grain Size on the Mechanical Properties of Low-Alloy Steel with Boron

The Influence of Austenite Grain Size on the Mechanical Properties of Low-Alloy Steel with Boron

A novel approach to study the effect of heating temperature on prior-austenite microstructure of a Japanese sword

Effects of Nb and Tempering Time on Carbide Precipitation Behavior and Mechanical Properties of Cr–Mo–V Steel for Brake Discs

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