喷丸对马氏体耐热钢高温蒸汽氧化行为的影响

doi:10.13251/j.issn.0254-6051.2021.02.012

摘要/Abstract

摘要： 利用高温蒸汽氧化试验装置对比研究P92、G115钢以及喷丸的G115钢的高温蒸汽氧化行为,结果表明,这3个试样的650 ℃蒸汽氧化动力学曲线符合ΔW＝ktⁿ规律。相同蒸汽氧化时间下G115钢的氧化质量增加远小于P92钢,主要是因为G115钢中富Cr层的形成和富Cu相在氧化层界面的析出。经喷丸处理的G115钢氧化质量增加小于未喷丸的G115钢,喷丸后的G115钢表面产生大量塑性变形,从而引入高密度的位错和滑移带,且内壁马氏体板条发生碎化,马氏体板条界增多。大量增加的滑移带、位错及马氏体板条界为Cr元素向表面扩散提供了通道,加快了基体中Cr元素向表面的扩散速度,是提高抗蒸汽氧化性能的主要原因。

关键词: 高温蒸汽氧化, 喷丸, 马氏体耐热钢, 氧化层

Abstract: High temperature steam oxidation behavior of the P92 and G115 steel with and without shot peening was studied by using a high temperature steam oxidation test device. The results show that, the steam oxidation kinetic curves of the three specimens conform to the law of ΔW=ktⁿ at 650 ℃. The oxidation mass gain of the G115 steel is much smaller than that of the P92 steel under the same steam oxidation time, mainly because of the formation of rich Cr layer in the steel and the precipitation of rich Cu phase at the interface of the oxidized layer. G115 steel treated by shot peening has less oxidation mass gain than G115 steel without shot peening. The surface of G115 steel after shot peening produces a large amount of plastic deformation, which leads to the introduction of high-density dislocation and slip bands. Martensite lath of the inner wall breaks down, which leads to the increase of martensite lath boundary. The massive increase of slip bands, dislocations and martensite lath boundaries provides diffusion channels of Cr elements to the surface, which accelerates the diffusion rate of Cr elements in the matrix to the surface, and becomes the main reason for improvement of anti-vapor oxidation performance.

Key words: high-temperature steam oxidation, shot peening, martensitic heat-resistant steel, oxidized layer

中图分类号:

TG174.4

谌康, 蔡文河, 杜双明, 董树青, 高大伟, 白银. 喷丸对马氏体耐热钢高温蒸汽氧化行为的影响[J]. 金属热处理, 2021, 46(2): 66-73.

Shen Kang, Cai Wenhe, Du Shuangming, Dong Shuqing, Gao Dawei, Bai Yin. Effect of shot peening on high-temperature steam oxidation behavior of martensitic heat-resistant steel[J]. Heat Treatment of Metals, 2021, 46(2): 66-73.

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