CAJ | 학술논문

对冷轧钛板试样进行高密度脉冲电流处理(最大电流密度7.22 kA/mm2,周期110 μs).应用单向拉伸试验对不同状态试样的力学性能进行测试,通过光学金相显微镜(OM)观察试样的微观组织形貌.结果表明,脉冲电流处理后,在钛板材试样中形成细小的等轴再结晶晶粒和片层组织共存的组合组织.由于晶粒的细化和片层组织的出现,使得脉冲电流处理试样的强度明显高于普通退火试样的,最大相差100 MPa.在屈服强度和抗拉强度大幅度提高的同时,脉冲电流处理试样仍然保持良好的塑性,具有更好的强度和韧性.脉冲电流是改善冷轧钛板力学性能的一种有效方法.
대랭알태판시양진행고밀도맥충전류처리(최대전류밀도7.22 kA/mm2,주기110 μs).응용단향랍신시험대불동상태시양적역학성능진행측시,통과광학금상현미경(OM)관찰시양적미관조직형모.결과표명,맥충전류처리후,재태판재시양중형성세소적등축재결정정립화편층조직공존적조합조직.유우정립적세화화편층조직적출현,사득맥충전류처리시양적강도명현고우보통퇴화시양적,최대상차100 MPa.재굴복강도화항랍강도대폭도제고적동시,맥충전류처리시양잉연보지량호적소성,구유경호적강도화인성.맥충전류시개선랭알태판역학성능적일충유효방법.
Specimens cut from the cold-rolled commercially pure (CP) Ti sheet were treated by high density electropulsing (the maximum current density 7.22 kA/mm2,pulse period 110 μs).The deformation behaviors of the CP Ti specimens at different states were determined by the uniaxial tensile test.The microstructure morphologies were observed by the optical microscopy.The results show that the electropulsing induced formation of fine equal-axial grains and lamellar microstructures,which leads to the strength of the electropulsed CP Ti higher than that of the conventional annealed CP Ti.After electropulsing,the tensile strength and yield strength are increased by 100 MPa.And the electropulsed CP Ti has a good plasticity.The experimental results demonstrate that the electropulsing provides an effective approach to enhance the strength of cold-rolled CP Ti sheet and retain the required high ductility.