By the comparison of hardness and optical microstructure between fired part and non-fired part of the well-frame, it is found that the hardness of the fired part has increased.
通过对井架底部火烧部位和未火烧部位进行硬度和显微组织的对比试验发现，火烧部位硬度得到提高；
By the comparison of hardness and optical microstructure between fired part and non-fired part of the well-frame, it is found that the hardness of the fired part has increased.
通过对井架底部火烧部位和未火烧部位进行硬度和显微组织的对比试验发现，火烧部位硬度得到提高；
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