Mészáros István, Bögre Bálint
Department of Materials Science and Engineering, Budapest University of Technology and Economics, Bertalan Lajos utca 7, 1111 Budapest, Hungary.
Materials (Basel). 2019 Jul 9;12(13):2205. doi: 10.3390/ma12132205.
The aim of this work was to study expansively the process of the eutectoidal phase transformation of 2507-type super-duplex stainless steel. Three sample sets were prepared. The first sample set was made to investigate the effect of the previous cold rolling and heat treatment for the eutectoidal phase transformation. Samples were cold rolled at seven different rolling reductions which was followed by heat treatment at five different temperatures. The second sample set was prepared to determine the activation energy of the eutectoidal decomposition process using the Arrhenius equation. Samples were cold rolled at seven different rolling reductions and were heat treated at the same temperature during eight different terms. A third sample set was made to study how another plastic-forming technology, beside the cold rolling, can influence the eutectoidal decomposition. Samples were elongated by single axis tensile stress and were heat treated at the same temperature. The results of the first and the third sample sets were compared. The rest δ-ferrite contents were calculated using the results of AC and DC magnetometer measurements. DC magnetometer was used as a feritscope device in this work. Light microscope and electron back scattering diffraction (EBSD) images demonstrated the process of the eutectoidal decomposition. The thermoelectric power and the hardness of the samples were measured. The results of the thermoelectric power measurement were compared with the results of the δ-ferrite content measurement. The accurate value of the coercive field was determined by a Foerster-type DC coercimeter device.
这项工作的目的是广泛研究2507型超级双相不锈钢的共析相变过程。制备了三组样品。第一组样品用于研究前期冷轧和热处理对共析相变的影响。样品在七种不同的轧制压下率下进行冷轧，随后在五种不同温度下进行热处理。第二组样品用于使用阿累尼乌斯方程确定共析分解过程的活化能。样品在七种不同的轧制压下率下进行冷轧，并在八个不同时间段内在相同温度下进行热处理。制备第三组样品是为了研究除冷轧外的另一种塑性成形技术如何影响共析分解。样品通过单轴拉伸应力进行拉伸，并在相同温度下进行热处理。比较了第一组和第三组样品的结果。利用交流和直流磁力计测量结果计算残余δ铁素体含量。在这项工作中，直流磁力计用作铁素体探伤仪。光学显微镜和电子背散射衍射（EBSD）图像展示了共析分解过程。测量了样品的热电功率和硬度。将热电功率测量结果与δ铁素体含量测量结果进行了比较。通过福斯特型直流矫顽磁力计装置确定矫顽场的准确值。
