Development of the modified high Cr ferritic heat-resistant steel

Liu, C. X.; Liu, Y. C.; Ning, Baoqun

doi:10.1179/1432891715z.0000000001808

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“…alloy [17]. This inconsistency can be explained as follows: (1) High strength of the modified high Cr ferritic steel employed in this experiment hinders the interface mobility for the shear-dominated martensitic transformation (the yield strength of this steel developed by our group is high to near 800 MPa at room temperature [38]); (2) the value of lengthening rate of martensitic lath is assumed as infinite, leading to the underestimation of the real velocity. Even so, the fitted values of v have the definite reliability of physical realness, which are compatible with those observed for pure iron (*3910 -6 m/s 1 ) [39] and Cu-AlNi alloy (about 10 -6 to 10 -2 m/s) [40].…”

Section: Non-instantaneous Growth Model For Martensitic Transformationmentioning

confidence: 94%

Non-instantaneous growth characteristics of martensitic transformation in high Cr ferritic creep-resistant steel

et al. 2016

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Microstructural observation and high-resolution dilatometry were employed to investigate kinetics of martensitic transformation in high Cr ferritic creep-resistant steel upon different quenching/cooling rates. By incorporating the classical athermal nucleation and impingement correction, a non-instantaneous growth model for martensitic transformation has been developed. The developed model describes austenite/martensite interface mobility during martensite growth. The growth rate of martensite is found to be varied from 1 9 10 -6 to 3 9 10 -6 m/s. The low interface mobility suggests that it is not appropriate to presume the instantaneous growth behavior of martensite. Moreover, based on the proposed model, nucleation rate of martensite under different cooling rates is found to be nearly the same, while the growth rate of martensite is promoted by increasing the cooling rate.

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