为了获得板材在大变形范围内的硬化性能,采用硬度试验与单向拉伸试验相结合的方法对材料的硬化行为进行了研究.以碳钢板为研究对象,通过测量断裂后试件不同部位的微氏硬度获得变形量与硬度之间的关系,并结合硬度与屈服应力的关系,获得了常规拉伸试验方法无法获得的大变形阶段的硬化行为.结果表明,通过该方法获得的硬化曲线变形范围广,结果可靠,能够满足塑性大变形的需要.
To achieve a hardening curve with wide range strain, the hardening behavior of mild steel is re- searched by micro-hardness method and uniaxial tension test. The relationships between deformation and hard- ness can be obtained by the micro-hardness on the fractured sample, and then the hardening behaviors with wide strain can be obtained considering the relations between hardness and the yield stress. In the experi- ments, grids are made on the sample for the accurate location calculation after deformation. The results show that the hardening curve obtained by the advanced method can reflect the materials hardening properties under the large deformation.
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