Annealing is a heat treatment procedure in which the mechanical properties of a material <span style="font-family:Verdana;">are</span><span style="font-family:Verdana;"> being alt...Annealing is a heat treatment procedure in which the mechanical properties of a material <span style="font-family:Verdana;">are</span><span style="font-family:Verdana;"> being altered, and such alterations cause changes in its properties such as strength and hardness. It is usually carried out to improve ductility and toughness, to reduce hardness and to remove carbides. This study deals with the use of image analysis processing method for the measurement of structure of six annealed samples of 0.17% High Strength Low Alloy (HSLA) Steels (840<span style="white-space:nowrap;">°</span>C - 990<span style="white-space:nowrap;">°</span>C) with 30<span style="white-space:nowrap;">°</span>C interval and 30 minutes soaking time. From the optical microscope images using Image J program</span><span style="font-family:Verdana;">,</span><span style="font-family:Verdana;"> some parameters like calculation of area, pixel value statistics, distances and angles measurements, edge detection, such as the circularity, ferret angle, solidity and perimeter, average area and the percentage area </span><span style="font-family:Verdana;">were</span><span style="font-family:Verdana;"> examined. The annealed sample of 960<span style="white-space:nowrap;">°</span>C gave the highest grain count of 543 with a perimeter of 41.518;standard deviation 7.057 and a mean of 28.722 which shows that annealing greatly improved the fatigue life of the steel. From the mechanical analysis result, the annealed sample at 840<span style="white-space:nowrap;">°</span>C has a highest hardness value of 129.4 BHN and gave the lowest impact value of 58.75 J. This study shows a significant decrease in the hardness value as the annealing temperature increased which signifies that annealing temperature enhanced the fatigue property and tensile strength (wear strength) of the steel in study.</span>展开更多
目的研究一种表征可吸收胶原蛋白材料微观形貌的方法,并分析其孔隙率和孔径。方法利用场发射扫描电子显微镜(Scanning Electron Microscope,SEM),在不同的加速电压下对未喷金样品和喷金样品进行拍摄,使用Image J软件对所得的SEM图像的...目的研究一种表征可吸收胶原蛋白材料微观形貌的方法,并分析其孔隙率和孔径。方法利用场发射扫描电子显微镜(Scanning Electron Microscope,SEM),在不同的加速电压下对未喷金样品和喷金样品进行拍摄,使用Image J软件对所得的SEM图像的孔隙率和孔径进行分析,并对结果的有效性进行验证。结果样品未喷金时使用低倍加速电压可获得清晰的SEM图像;样品喷金后其耐受电压能力明显提高,即使在较高的加速电压下依然能获得清晰的SEM图像。使用Image J软件可对拍摄的SEM图像的孔径和孔隙率进行分析,其中,平均孔隙率为50.9%,平均孔径为11.9μm;孔隙率离散系数为8.6%,孔径离散系数6.7%。结论场发射SEM结合Image J软件是一种表征可吸收胶原蛋白材料孔结构的有效方法,可解决相关标准中方法缺失的问题。展开更多
文摘Annealing is a heat treatment procedure in which the mechanical properties of a material <span style="font-family:Verdana;">are</span><span style="font-family:Verdana;"> being altered, and such alterations cause changes in its properties such as strength and hardness. It is usually carried out to improve ductility and toughness, to reduce hardness and to remove carbides. This study deals with the use of image analysis processing method for the measurement of structure of six annealed samples of 0.17% High Strength Low Alloy (HSLA) Steels (840<span style="white-space:nowrap;">°</span>C - 990<span style="white-space:nowrap;">°</span>C) with 30<span style="white-space:nowrap;">°</span>C interval and 30 minutes soaking time. From the optical microscope images using Image J program</span><span style="font-family:Verdana;">,</span><span style="font-family:Verdana;"> some parameters like calculation of area, pixel value statistics, distances and angles measurements, edge detection, such as the circularity, ferret angle, solidity and perimeter, average area and the percentage area </span><span style="font-family:Verdana;">were</span><span style="font-family:Verdana;"> examined. The annealed sample of 960<span style="white-space:nowrap;">°</span>C gave the highest grain count of 543 with a perimeter of 41.518;standard deviation 7.057 and a mean of 28.722 which shows that annealing greatly improved the fatigue life of the steel. From the mechanical analysis result, the annealed sample at 840<span style="white-space:nowrap;">°</span>C has a highest hardness value of 129.4 BHN and gave the lowest impact value of 58.75 J. This study shows a significant decrease in the hardness value as the annealing temperature increased which signifies that annealing temperature enhanced the fatigue property and tensile strength (wear strength) of the steel in study.</span>
