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The square Q235B plates which are perpendicular to the rolling direction are bent to different degrees by WDW-200 kN universal testing machine, and the relationship between grain size variation, dislocation movement and neutral layer are studied. The results show that microstructure evolves from lath grain into equiaxed grain, and with neutral layer as the boundary, the outer layer thickness is thinner under the action of external tension when the plate is bent, the thickness of the inner layer increasing under pressure, and under the maximum deflection, the increase of r/t specimen is not easy to crack.

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利用WDW-200 kN万能试验机将垂直于轧制方向的方形Q235B板材进行不同程度的弯曲，研究晶粒的变化和位错运动与中性层的关系。结果表明，显微组织由板条状晶粒演变成等轴晶粒，以中性层为界，板材弯曲时在外部拉力的作用下外层厚度变薄，内层在压力作用下增加厚度，最大挠度下，增大r/t试样不易弯裂。

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戴雨馨（1993-），女，河北省沧州市人，在读硕士，助理工程师，现从事无损检测工作。

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戴雨馨（1993-），女，河北省沧州市人，在读硕士，助理工程师，现从事无损检测工作。

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