Rolling and Annealing Effects on Microstructure and Hardness of Commercial 405 Stainless Steel
Rolling and Annealing Effects on Microstructure and Hardness of Commercial 405 Stainless Steel
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DOI：
10.17146/aij.2007.109
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发表时间：
2007-07
期刊：
影响因子：
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通讯作者：
A. K. Jahja;N. Effendi;M. Dani
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文献类型：
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作者：
A. K. Jahja;N. Effendi;M. Dani
对工业SS-405钢试件在350℃下进行了真应变分别为5%、10%和15%的冷轧试验，将轧制后的试件切成10×10×5 mm~3的大小，部分试件在550℃下退火24小时。然后所有样品在蚀刻之前被安装和抛光，以观察晶界。用光学显微镜(MO)对所有样品进行了显微组织观察，同时利用X射线衍射仪(X-射线衍射仪)对存在相进行了鉴定，并验证了晶体取向的变化；用维氏显微硬度计进行了硬度测试。X-射线衍射仪的显微组织观察结果表明，轧制样品的相颗粒呈长方形，并有明显的择优取向，主要倾向于(110)晶面。显微硬度测试结果表明，轧制时样品的硬度有所提高；主要是由于原始样品的厚度几乎可以忽略不计(尺寸仅为5 mm)，15%的轧制样品与10%的轧制样品相比，硬度仅略有下降；造成这种影响的主要原因是一些位错渗入表面，导致大部分样品的内应力降低。在轧制退火的样品中，与轧制样品相比，硬度有非常显著的降低。这里的主要原因是在退火过程中发生的再结晶过程，这往往会显著减少位错。
The "cold-rolling" experiments for several values of true strain namely 5 percent, 10 percent, and 15 percent respectively have been carried out on commercial SS-405 steel samples at 350 o C; the as-rolled samples were cut into several pieces in size of 10 x 10 x 5 mm 3 , and some pieces were annealed to 550 o C for 24 hours. All samples were then mounted and polished before etching in order to observe the grain boundaries. The microstructure observation on all samples was carried out by using optical microscope (MO), meanwhile X-ray diffraction technique was employed in order to support the identification of the existing phases and to verify changes with respect to crystal orientation; the hardness tests were carried out by using Vickers micro hardness tester. The microstructure observation supported by X-ray diffraction results shows that the phase grains of rolled sample tends to take the oblong-shape, accompanied by a preferred orientation predominantly inclined toward the (110) plane. The microhardness testing results show that there has been an increase in the hardness of the as-rolled samples; Mainly because of the nearly negligible thickness of the original sample (being only 5 mm in size), the 15 percent as-rolled samples exhibits only a slight reduction in hardness compared to the 10 percent as-rolled samples; The main cause of this effect is the movement of some dislocations infiltrating the surface resulting in the reduction of the inner-stress in the bulk of the samples. In the rolled-annealed samples there is a very significant reduction in hardness compared to the as-rolled samples. Here the main cause is the recrystallization process taking place during annealing, which tends to significantly reduce the dislocations.