Vickers hardness test showed that the hardness of ferrite in healing area is higher than that in matrix, which may result from the strengthening of polyangular grains.
维氏硬度测试结果显示，出现在愈合区的铁素体组织维氏硬度高于基体区铁素体组织，可能原因是愈合区中出现的多边晶块结构所引发的强化。
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