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Influence of electrolytic plasma nitriding mode on structural phase state of pearlitic steel

机译:电解质等离子体氮化模式对珠菌钢结构相位态的影响

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The paper describes results of studies of phase transitions in structural phase state occurring in the type 0.34C-1Cr-1Ni-1Mo-Fe steel under electrolytic plasma nitriding in nitrogen-containing water solution. The nitriding voltages considered in the given study were 550 and 600 V. The research was conducted by means of X-ray diffraction electron microscopy. The specimens were studied in two states : 1) before modification (original state) and 2) after nitriding in the surface layer of the specimen. The study was conducted on thin foils. It was found that nitriding lead to significant changes in the structure of steel, namely in its phase composition and in the number of existing phases. In the original state the structure of steel was given as lamellar pearlite, ferritic carbide mix and fragmented ferrite. After 550 V nitriding it was lath martensite, plates of α-phase, with colonies of thin parallel plates of γ-phase and coarse grains of α-phase, containing γ-phase grains which were different in size and shape and were various-directional. Increase in nitriding voltage up to 600 V lead to change in the structure given as a lamellar non-fragmented pearlite and fragmented ferrite. The original state was marked by presence of particles of M_(3)C cementite, after nitriding irrespective of the voltage it had the particles of M_(3)C alloyed cementite, Fe_(3)Mo_(3)N nitride and Cr_(2)C_(0.61)N_(0.39)carbonitride. The sizes, volume fractions and locations of particles were dependent on nitriding voltage.
机译:本文描述了在含氮水溶液中的电解质等离子体下在0.34℃-1Cr-1Ni-1Mo-Fe-Fe钢中发生的结构相位状况的相变的研究结果。在给定的研究中考虑的氮化电压为550和600V。通过X射线衍射电子显微镜进行研究。在氮化样品的表面层氮化后修饰(原始状态)和2)之前,在两个状态下进行了两种状态:1)。该研究在薄箔上进行。发现氮化导致钢结构的显着变化,即在其相组成和现有阶段的数量中。在原始状态下,钢的结构作为层状珠光体,铁素体碳化物混合物和碎裂的铁氧体。在550V氮化之后,它是Lath Martensite,α-阶段的板,具有γ相和粗颗粒的薄平平板的菌落,含有γ-阶段颗粒的尺寸和形状不同,并且是各种方向的。氮化电压的增加高达600V导致作为层状非碎片珠光体和碎裂的铁氧体的结构变化。原始状态是通过M_(3)C渗碳颗粒的颗粒的存在,在氮化之后,氮化时,它具有M_(3)C合金渗碳晶体的颗粒,Fe_(3)Mo_(3)N氮化物和CR_(2 )C_(0.61)N_(0.39)碳氮化物。粒子的尺寸,体积分数和位置取决于氮化电压。

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