吐丝温度对82B线棒材氧化层结构与机械剥离性能的影响

Influence of spinning temperature on microstructure and mechanical descaling property of oxide layer of 82B wire rod

为改善82B线棒材表面氧化铁皮的机械除鳞性能,研究了吐丝温度对氧化皮结构与机械剥离性能的影响。结果表明:82B钢线棒材表面氧化皮具有双层状结构,外层为Fe_(3)O_(4),内层为FeO+Fe_(3)O_(4),未检测到明显的Fe_(2)O_(3)层。当吐丝温度从880℃升高至930℃时,氧化皮的平均厚度从约14.46μm增加至16.39μm;[FeO+Fe_(3)O_(4)]/[Fe_(3)O_(4)]层厚比从2.69降至1.98。氧化层-基体界面微空隙层中含有大量Fe_(3)O_(4)粒子,微空隙层的数量与尺寸增加。随着吐丝温度的升高,氧化皮剥离形态由大块状转变为小块状与碎屑状,机械剥离表面残留大量以Fe_(3)O_(4)为主要组分的氧化铁皮,氧化铁皮临界剥离载荷与粘结强度增加。这表明提高吐丝温度将降低82B钢线棒材表面氧化铁皮的机械剥离性能。

In order to improve the mechanical descaling property of oxide scale on the surface of 82B wire rod,the effect of spinning temperature on the microstructure and mechanical descaling property of the oxide scale was studied.The results show that the oxide scale on the surface of the 82B steel wire rod has a double-layer structure,the outer layer is Fe_(3)O_(4),the inner layer is FeO+Fe_(3)O_(4),and no obvious Fe_(2)O_(3)layer is detected.When the spinning temperature increases from 880℃ to 930℃,the average thickness of oxide scale increases from about 14.46μm to 16.39μm,and the layer thickness ratio of[FeO+Fe_(3)O_(4)]/[Fe_(3)O_(4)]decreases from 2.69 to 1.98.There are a lot of Fe_(3)O_(4)particles in the micro void layer at the oxide layer-substrate interface,and the number and size of the micro void layer increase.With the increase of the spinning temperature,the peeling morphology of the oxide scale changes from large blocks to small blocks and chips,a large amount of oxide scale with Fe_(3)O_(4)as the main component remains on the mechanical peeling surface,and the critical peeling load and adhesive strength of the oxide scale increase.This indicates that increasing the spinning temperature will reduce the mechanical descaling property of the oxide scale on the surface of the 82B steel wire rod.