“…When ferrite appears, the hardness decreases significantly. Hardness corresponds with the microstructure, and martensite fraction after quenching has a great influence on hardness, which aligns with the previous research results of Ahmed et al [27–29]. Figure 4. Microstructure of typical test surfaces, (a) A-1; (b) A-7; (c) A-8; (d) B-1; (e) B-7 and (f) B-8. Figure 5. Phase fraction of different test surfaces, (a) A and (b) B.…”
Section: Resultssupporting
confidence: 90%
“…When ferrite appears, the hardness decreases significantly. Hardness corresponds with the microstructure, and martensite fraction after quenching has a great influence on hardness, which aligns with the previous research results of Ahmed et al [27][28][29].…”
Section: Hardness Test and Microstructure Observationsupporting
To study the effect of TiN precipitated particles on two end-quenching specimens of 20CrMnTi steel with different hardenability characteristics, the peripheral hardness of the samples is tested. The microstructures, austenite grain structures, characteristics of TiN particles are analyzed. The larger the grain size, the higher the martensite fraction and the higher the hardness. More uniform and more refined grains reduce the maximum peripheral hardness difference of end-quenched samples from 9.1HRC to 3.3HRC. The precipitation of as much fine TiN as possible in the solid phase plays an important role in obtaining more refined and more uniform austenite grains. TiN precipitates less during solidification and more in the solid phase in the sample with better hardenability, promoting grain refinement and more uniform peripheral hardness. In production, with a specific mass fraction of Ti, effectively inhibiting the precipitation of coarse TiN during solidification is the key to control narrow hardenability bandwidth for 20CrMnTi gear steel.
“…When ferrite appears, the hardness decreases significantly. Hardness corresponds with the microstructure, and martensite fraction after quenching has a great influence on hardness, which aligns with the previous research results of Ahmed et al [27–29]. Figure 4. Microstructure of typical test surfaces, (a) A-1; (b) A-7; (c) A-8; (d) B-1; (e) B-7 and (f) B-8. Figure 5. Phase fraction of different test surfaces, (a) A and (b) B.…”
Section: Resultssupporting
confidence: 90%
“…When ferrite appears, the hardness decreases significantly. Hardness corresponds with the microstructure, and martensite fraction after quenching has a great influence on hardness, which aligns with the previous research results of Ahmed et al [27][28][29].…”
Section: Hardness Test and Microstructure Observationsupporting
To study the effect of TiN precipitated particles on two end-quenching specimens of 20CrMnTi steel with different hardenability characteristics, the peripheral hardness of the samples is tested. The microstructures, austenite grain structures, characteristics of TiN particles are analyzed. The larger the grain size, the higher the martensite fraction and the higher the hardness. More uniform and more refined grains reduce the maximum peripheral hardness difference of end-quenched samples from 9.1HRC to 3.3HRC. The precipitation of as much fine TiN as possible in the solid phase plays an important role in obtaining more refined and more uniform austenite grains. TiN precipitates less during solidification and more in the solid phase in the sample with better hardenability, promoting grain refinement and more uniform peripheral hardness. In production, with a specific mass fraction of Ti, effectively inhibiting the precipitation of coarse TiN during solidification is the key to control narrow hardenability bandwidth for 20CrMnTi gear steel.
“…6 a and b respectively) showed little or no corrosion susceptibility which attests to corrosion superiority of stainless steels compared to cast-irons. This is not unexpected of stainless steels, because of their propensity for development of chromium oxide passive film that helps to protect their exposure to corrosion environment and slow down the corrosion rate [ [16] , [17] , [18] , [19] ]. Fig.…”
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