退火温度对极薄镀锡板组织性能的影响

Effect of annealing temperature on microstructure and properties of very thin tinplate

通过单向拉伸试验研究了不同退火温度对厚0.18 mm镀锡板力学性能的影响,利用X射线光电子能谱仪（XPS）研究了镀锡板抗时效性能。结果表明,在660-700℃退火温度范围内,随着退火温度的升高,板材屈服强度从295 MPa下降至274 MPa,抗拉强度从371 MPa下降至352 MPa,断后伸长率从24.2%上升至27.8%,晶粒尺寸从5.4μm上升至5.8μm,表面洛氏硬度从57.9 HR 30T下降至54.5 HR 30T,固溶C相对质量分数从90.5%下降至88.1%,固溶N相对质量分数从88.7%下降至83.7%。退火温度在700℃时,试验板材具有较好的塑性,较低的表面洛氏硬度,且固溶C、N含量更符合中国标准。

The influence of various annealing temperatures on mechanical properties of 0.18 mm tinplate was investigated by uniaxial tensile tests. The aging resistance properties of tinplate were studied using X-ray photoelectron spectrometer（XPS）. The results showed that when the annealing temperature increased from 660 ℃ to 700 ℃,the yield strength decreased from 295 MPa to 274 MPa,the tensile strength decreased from 371 MPa to 352 MPa,the percentage elongation after fracture increased from 24.2% to 27.8%,the grain size increased from 5.4 μm to 5.8 μm,the surface Rockwell hardness decreased from 57.9 HR 30 T to 54.5 HR 30 T,the relative mass content of solid solution C decreased from90.5% to 88.1%,and the relative mass content of solid solution N decreased from 88.7% to 83.7%. The tested sheet exhibited good plasticity,lower surface Rockwell hardness,as well as content of solid solution C and N were more accordant with the national standard when the annealing temperature is 700 ℃.