TY - JOUR

T1 - Distortion in 100Cr6 and nanostructured bainite

AU - Amey, C. M.

AU - Huang, H.

AU - Rivera-Díaz-del-Castillo, P. E.J.

PY - 2012/3

Y1 - 2012/3

N2 - A series of experiments on 100Cr6 and a nanostructured carbide-free bainitically transformed steel are performed. The effect of heat treatment conditions on the degree of distortion due to phase transformation is established. By transforming bainitically other than martensitically, cooling rate plays a major role in decreasing distortion by one order of magnitude in 100Cr6. Additional distortion reductions are possible by further decreasing the cooling rate when forming nanostructured carbide-free bainite. By invoking thermodynamic calculations and employing a neural network, it is shown that distortion can be engineered. When large amounts of retained austenite are present (such as the case of nanostructured bainite), this can be used to accommodate distortion. Additionally, it is possible to balance the expansion due to bainite formation with the contraction due to stress relaxation by controlling the amount of retained austenite. Exploitation of those mechanisms may aid in reducing distortion as a result of phase transformation (dimensional change) during the manufacturing of heat treated components.

AB - A series of experiments on 100Cr6 and a nanostructured carbide-free bainitically transformed steel are performed. The effect of heat treatment conditions on the degree of distortion due to phase transformation is established. By transforming bainitically other than martensitically, cooling rate plays a major role in decreasing distortion by one order of magnitude in 100Cr6. Additional distortion reductions are possible by further decreasing the cooling rate when forming nanostructured carbide-free bainite. By invoking thermodynamic calculations and employing a neural network, it is shown that distortion can be engineered. When large amounts of retained austenite are present (such as the case of nanostructured bainite), this can be used to accommodate distortion. Additionally, it is possible to balance the expansion due to bainite formation with the contraction due to stress relaxation by controlling the amount of retained austenite. Exploitation of those mechanisms may aid in reducing distortion as a result of phase transformation (dimensional change) during the manufacturing of heat treated components.

KW - Ferrous metals and alloys

KW - Microstructure

KW - Nano materials

U2 - 10.1016/j.matdes.2011.10.008

DO - 10.1016/j.matdes.2011.10.008

M3 - Journal article

AN - SCOPUS:80055054501

VL - 35

SP - 66

EP - 71

JO - Materials and Design

JF - Materials and Design

SN - 0264-1275

ER -