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以应用广泛的弹簧钢(60Si2Mn)为研究对象,利用Gleeble-1500试验机进行了单向压缩实验,对其在半固态下压缩变形过程中的力学特性及组织演变规律进行了观察及分析.实验结果表明:在液-固两相区间半固态坯料的流变应力很低,只有10MPa左右;流变应力随变形量的增加而出现应变软化现象,变形速率对其影响比较复杂.在压缩变形过程中,半固态坯料固-液两相参与塑性变形的方式是不同的,其组织形貌与变形温度、变形量和变形速率都有直接的关系.
A widely used spring steel (60Si2Mn) was selected as the research object and the uniaxial compression experiment was carried out by using the Gleeble-1500 testing machine. The mechanical properties and microstructure evolution during the semi-solid compression deformation were observed and analyzed. The results show that the flow stress of the semi-solid billet is very low at the liquid-solid two-phase range, only about 10 MPa, and the strain softening occurs with the increase of the deformation due to the increase of the deformation. The deformation rate affects the deformation of the billet. In the semi-solid billet solid-liquid two phases participate in the plastic deformation is different, and its morphology and deformation temperature, deformation and deformation rate has a direct relationship.