Micro Analysis in Healing Area of Inner Crack for a 45 Steel
Healing processing of the samples of a 45 steel was carried out. The healing area of inner cracks in the sample made by method “Drilling – Compressing” was observed and analyzed. SEM and FESEM analysis displayed that the microstructure in healing area is should be was mainly ferrite, and ferrite grain growth across the interface of inner crack, and there exists should be exist many polyangular grains of several hundreds nanometer in ferrite of healing area. Vickers-hardness test showed that the hardness of ferrite in healing area is should be was higher than that in matrix, which may result from the strengthening of polyangular grains.
Jianmin Zeng, Zhengyi Jiang, Taosen Li, Daoguo Yang and Yun-Hae Kim
Y. J. Zhang et al., "Micro Analysis in Healing Area of Inner Crack for a 45 Steel", Advanced Materials Research, Vols. 199-200, pp. 58-61, 2011