Multi-angle analysis of Mo on martensite–austenite component and toughness in SCGHAZ of X80 pipeline automatic ring welding

IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
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Abstract

In order to solve the embrittlement problem of welded joint of pipeline steel, this paper proposes to study the influence of Mo on M-A component of the subcritically reheated coarse-grained HAZ (SCGHAZ), and Mo on bainite transformation. Through the welding thermal simulation experiment, two kinds of X80 pipeline steel with different Mo content were set different secondary thermal cycle peak temperatures to simulate the heat affected zone (HAZ). Samples in the SCGHAZ were selected to observe the microstructure, M-A component, microalloy-element distribution and fracture crack trend, and comprehensively analyze the reasons for the deterioration of impact toughness caused by the changes of Mo content. The results show that the increase of Mo content leads to the formation of twinning martensite, which is one of the reasons for the deterioration of toughness. Mo is enriched at the interface of ferrite and M-A component, reducing the binding energy at the interface, resulting in the desorption of M-A component from the matrix, the formation of pores and becoming the nucleation site of cracks, resulting in the generation of micro-cracks and the decrease of toughness.

多角度分析 Mo 对 X80 管道自动环焊 SCGHAZ 中马氏体-奥氏体成分和韧性的影响
为了解决管线钢焊接接头的脆性问题,本文拟研究 Mo 对亚临界再加热粗晶粒热影响区(SCGHAZ)M-A 成分的影响,以及 Mo 对贝氏体转变的影响。通过焊接热模拟实验,对两种不同 Mo 含量的 X80 管线钢设置不同的二次热循环峰值温度来模拟热影响区(HAZ)。选取 SCGHAZ 中的样品,观察其显微组织、M-A 成分、微合金元素分布和断裂裂纹趋势,综合分析 Mo 含量变化导致冲击韧性劣化的原因。结果表明,Mo 含量的增加会导致孪晶马氏体的形成,这是导致韧性恶化的原因之一。Mo 在铁素体和 M-A 组份的界面上富集,降低了界面上的结合能,导致 M-A 组份从基体中解吸,形成孔隙,成为裂纹的成核部位,从而产生微裂纹,降低了韧性。
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来源期刊
Journal of Materials Research and Technology-Jmr&t
Journal of Materials Research and Technology-Jmr&t Materials Science-Metals and Alloys
CiteScore
8.80
自引率
9.40%
发文量
1877
审稿时长
35 days
期刊介绍: The Journal of Materials Research and Technology is a publication of ABM - Brazilian Metallurgical, Materials and Mining Association - and publishes four issues per year also with a free version online (www.jmrt.com.br). The journal provides an international medium for the publication of theoretical and experimental studies related to Metallurgy, Materials and Minerals research and technology. Appropriate submissions to the Journal of Materials Research and Technology should include scientific and/or engineering factors which affect processes and products in the Metallurgy, Materials and Mining areas.
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