An Accurate Method for Crystallographic Reconstruction of Parent Austenite from Inherited Martensite in a Low-Alloy Steel

Crystals

Xinyun Wang¹  Junsong Jin¹  Daokuan Wang²  Qiaomin Li² 

[1] Mould Technology, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China;;State Key Laboratory of Materials Processing and Die &

关键词: reconstruction criterion;    parent austenite;    martensite;    orientation relationship;   

DOI  :  10.3390/cryst9070358

来源: DOAJ

【 摘 要 】

The microstructure of austenite at high temperatures, which cannot be reserved at room temperatures, determines the properties of its transformed phase in low-alloy steels. Consequently, an accurate method is herein developed to reconstruct local orientations of the parent austenite ( $\mathsf{\gamma }$ ) phase from electron backscatter diffraction maps of the martensite ( ${\alpha }^{\prime }$ ) microstructure. The orientation map of ${\alpha }^{\prime }$ is cropped into a grid of data squares as the reconstruction unit. The cropped square is then divided into the square inherited from only one $\mathsf{\gamma }$ grain and the square inherited from more than one $\mathsf{\gamma }$ grain. The local orientations around parent $\mathsf{\gamma }$ grain boundaries are more accurately determined using a newly proposed reconstruction criterion. Furthermore, the solution spaces for the orientation relationship and the parent $\mathsf{\gamma }$ orientation are refined, which simultaneously improves the calculation accuracy and efficiency of reconstruction procedure. The validated reconstruction method is applied to obtain local orientations of the deformed $\mathsf{\gamma }$ microstructure accurately.

【 授权许可】

Unknown