热时效和离子辐照增强低合金钢焊缝晶间P偏析

EngRN: Metals & Alloys (Topic) Pub Date : 1900-01-01 DOI:10.2139/ssrn.3659823

Leifeng Zhang, B. Radiguet, P. Todeschini, C. Domain, Yang Shen, P. Pareige

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引用次数: 1

摘要

溶质偏析现象的定量研究在材料科学中具有重要意义。本研究采用电子后向散射衍射(EBSD)/透射九池衍射(TKD)/原子探针层析成像(APT)方法研究了热老化和离子辐照(均在400°C)对晶间P偏析行为的影响。P、C、Si、Mn、Ni、Cr和Mo的共偏析出现在晶界(GBs)。在热时效和离子辐照焊缝中，所有检测到的GB类型的P偏析都有所增加。热力学和动力学预测证实了离子辐照下P在GBs处的辐射增强偏析(RES)机制。三元Fe-P-C模型高估了多组分体系中的P偏析水平。

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Thermal-Ageing and Ion-Irradiation Enhanced Intergranular P Segregation in Low Alloy Steel Welds

Quantitative study of solute segregation phenomenon is crucial in material science. In the present study, the influence of thermal ageing and ion irradiation (both at 400°C) on intergranular P segregation behavior was studied by a correlative Electron Backscattering Diffraction (EBSD)/Transmission Kikuchi Diffraction (TKD)/Atom Probe Tomography (APT) methodology. The co-segregation of P, C, Si, Mn, Ni, Cr and Mo appears at Grain Boundaries (GBs). There is an increased P segregation for all the detected GB types in both thermally-aged and ion-irradiated welds. Thermodynamic and kinetic predictions confirm the Radiation Enhanced Segregation (RES) mechanism of P at GBs under ion irradiation. The ternary Fe-P-C model overestimates P segregation level in a multicomponent system.

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EngRN: Metals & Alloys (Topic)

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