Abstract

The work is devoted to the study of the features of the formation of modified surface layers in the electrolytic-plasma coating of the surface of 20GL steel used for the manufacture of parts of a railroad train. The results of the investigation of the effect of the electrolytic-plasma coating on the morphology and the structural-phase state of the surface, the dislocation structure of 20GL steel before and after treatment are presented. It has been established that in the initial state 20GL steel has a ferrite-pearlite structure, and after the electrolytic-plasma coating of the surface, a lamellar structure of perlite and ferrite is observed. It is found that in the initial state 20GL steel has the following average parameters of the fine structure: 〈ρ〉 = 2.41 × 10¹⁰ cm^–2, 〈ρ_±〉 = 2.23 × 10¹⁰ cm^–2, 〈χ〉 = 〈χ_lp〉 + 〈χ_elas〉 = 560 + 25 = 585 MPa, 〈σ_l〉 = 310 MPa, 〈\({{\sigma }_{{\text{d}}}}\)〉 = 〈\(\sigma _{{\text{d}}}^{{{\text{pl}}}}\)〉 + 〈\(\sigma _{{\text{d}}}^{{{\text{elas}}}}\)〉 = 300 + 35 = 335 MPa; and after processing, the average parameters of the fine structure changed as follows: 〈ρ〉 = 1.03 × 10¹⁰ cm^–2, 〈ρ_±〉 = 0.82 × 10¹⁰ cm^–2, 〈χ〉 = 〈χ_pl〉 = 205 MPa, 〈σ_l〉 = 200 MPa, 〈\({{\sigma }_{{\text{d}}}}\)〉 = 〈\(\sigma _{{\text{d}}}^{{{\text{pl}}}}\)〉 = 175 MPa.

中文翻译：

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表面电解等离子淬火后结构钢20GL位错结构的形貌变化

摘要

这项工作致力于研究用于铁路零件制造的20GL钢表面的电浆等离子涂层中改性表面层的形成特征。给出了电浆等离子体处理对20GL钢处理前后表面形貌和结构相态，位错结构的影响的研究结果。已经确定，在初始状态下20GL钢具有铁素体-珠光体结构，并且在表面进行了电浆等离子涂覆之后，观察到了珍珠岩和铁素体的层状结构。发现在初始状态下20GL钢具有以下平均组织参数：＆lt;ρ＆gt; = 2.41×10 ¹⁰ cm ^–2，＆lt;ρ_± > = 2.23×10 ¹⁰厘米^-2，<χ> = <χ _LP > + <χ _ELAS > = 560 + 25 = 585兆帕，<σ_升> = 310兆帕，< \（{{\西格玛} _ { {\ text {d}}} \）） = 〈\（\ sigma _ {{\ text {d}}} ^ {{{{\ text {pl}}}} \）〉 + 〈\（\ sigma _ {{\ text {d}}} ^ {{{\ text {elas}}}} \）〉 = 300 + 35 = 335 MPa；经过处理后，细微结构的平均参数变化如下：〈ρ〉 = 1.03×10 ¹⁰ cm ^–2，〈ρ _±〉 = 0.82×10 ¹⁰ cm ^–2，〈χ〉 = 〈_χpl〉 = 205兆帕，<σ_升> = 200兆帕，<\（{{\ sigma __ {{text {d}}}} \）〉 = 〈\（\ sigma _ {{\ text {d}}} ^ {{{{\ text {pl}}}}} \\ ）＞ ＝ 175MPa。