求冲击试样断口图分析

xupeng

[localimg=180,121]1[/localimg][localimg=180,121]2[/localimg][localimg=180,121]3[/localimg][localimg=180,121]4[/localimg][localimg=180,121]5[/localimg][localimg=180,121]6[/localimg]此试样断口为55号钢，经过调质热处理。请专家帮忙分析一下造成的原因。