Rapid communicationInfluence of silicon on secondary hardening of 5 wt% Cr steels
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Microstructure and mechanical properties from an attractive combination of plasma nitriding and secondary hardening of M50 steel
2018, Applied Surface ScienceCitation Excerpt :For the substrate hardness, a typical secondary hardening peak (i.e. a maximum tempering hardness of 691 HV) could be observed at about 520 °C, beyond this temperature, softening occurs. Variations of hardness are in good correspondence with the secondary hardening curve in tempering reported in [25,28], indicating a wonderful combination of mechanical properties between the nitrided surface layer and the substrate can be achieved in M50 steel. The surface hardness is significantly increased and the substrate is not softened or even higher.
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2017, Comprehensive Materials FinishingMicrostructure, mechanical properties and strengthening mechanisms of 5Cr5MoV modified by aluminum
2015, Materials and DesignCitation Excerpt :The hardness–tempering temperature curves of 5Cr5MoV–xAl steels are shown in Fig. 8. It is generally known that the secondary hardening in Cr–Mo–V steel mainly caused by the dispersive precipitation of secondary carbides [25,26]. It can be found that the temperature at which the secondary hardening peak occurs is fairly constant with the aluminum concentration up to 1.63 wt.
Effect of double quenching and tempering heat treatment on the microstructure and mechanical properties of a novel 5Cr steel processed by electro-slag casting
2014, Materials Science and Engineering: ACitation Excerpt :As reported in previous investigations [36,37], Si could suppress the formation of cementite, and thus would also affect the subsequent formation and distribution of alloy carbides which precipitated during the tempering process. Due to the suppression of cementite formation by Si, the anticipation of alloy carbides formation during tempering would occur, especially M7C3 [38]. As a result, M7C3 nucleated directly along the lath and prior austenite grain boundaries, on which alloy elements and carbon diffused faster.
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