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首页> 外文期刊>Materials Characterization >Atomic-scale investigations of isothermally formed bainite microstructures in 51CrV4 spring steel
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Atomic-scale investigations of isothermally formed bainite microstructures in 51CrV4 spring steel

机译：51Crv4弹簧钢中等温形成的贝氏体微观结构的原子级研究

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摘要

Atomic-scale investigation was performed on 51CrV4 steel, isothermally held at different temperatures within the bainitic temperature range. Transmission electron microscopy (TEM) analysis revealed three different morphologies: lower, upper, and inverse bainite. Atom Probe Tomography (APT) analysis of lower bainite revealed cementite particles, which showed no evidence of partitioning of substitutional elements; only carbon partitioned into cementite to the equilibrium value. Carbon in the bainitic ferrite was found to segregate at dislocations and to form Cottrell atmospheres. The concentration of carbon remaining in solution measured by APT was more than expected at the equilibrium. Upper bainite contained cementite as well. Chromium and manganese were found to redistribute at the cementite-austenite interface and the concentration of carbon in the ferritic matrix was found to be lower than the one measured in the case of lower bainite. After isothermal treatments close to the bainite start temperature, another austenite decomposition product was found at locations with high concentration of Mn and Cr, resembling inverse bainite. Site-specific APT analysis of the inverse bainite reveals significant partitioning of manganese and chromium at the carbides and at the ferrite/martensite interfaces, unlike what is found at isothermal transformation products at lower temperatures.
机译：在51Crv4钢上进行原子尺度调查，在贝氏体温度范围内的不同温度下等温均保持。透射电子显微镜（TEM）分析显示出三种不同的形态：较低，上部和逆贝氏体。原子探测断层扫描（APT）下贝氏体的分析显示出渗碳岩颗粒，显示出没有替代元素分配的证据;只有碳分配成渗碳物到平衡值。发现贝氏体铁素体中的碳在脱位处隔离并形成Cottrell大气压。通过APT测量的溶液中剩余的碳浓度超过平衡的预期。上贝卡铝也含有渗碳石。发现铬和锰在渗碳石 - 奥氏体界面下重新分配，发现铁素体基质中的碳浓度低于下贝氏体的情况下测量的碳浓度。在接近贝氏体开始温度的等温治疗后，在具有高浓度Mn和Cr的位置发现另一种奥氏体分解产物，类似于贝氏体。逆贝氏体的特异性APT分析揭示了在碳化物和铁氧体/马氏体接口的锰和铬的显着分配，与在较低温度下的等温转化产物中发现的内容不同。

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