Effect of Cr addition on microstructure, mechanical properties, and corrosion behavior of weld metal in weathering steel of high-speed train bogie

IF 2.4 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Welding in the World Pub Date : 2024-10-17 DOI:10.1007/s40194-024-01848-9

Gaojian Wang, Dandan Kang, Yanhong Ye, Dean Deng

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Abstract

The effects of Cr addition on the microstructure, mechanical properties, and corrosion behavior of two weld metals containing Ti or Mo within the Ni-Cu alloys used in high-speed train bogies were investigated. The results show that Cr can increase the acicular ferrite (AF) by about 15%, reduce the primary ferrite (PF) and the ferrite with second phase aligned (FSP), and slightly increase the M-A constituents in the weld containing Ti. Cr addition scarcely alters the AF, leads to a decline in PF and an increase in FSP, and causes a substantial increase in M-A constituents from 0.4 to 2.5% in the as-welded zone containing Mo. Meanwhile, it was found that Cr addition negatively affects weld toughness in the weld containing Mo due to the increase in the proportion and size of M-A constituents and the coarsening of inclusions. Regarding the corrosion resistance, Cr addition can promote the absorption of Cr on the surface of inclusions. This is the main reason for the reduction of the initial corrosion rate of the weld containing Mo, while this effect is attenuated in the welds containing Ti. In addition, Cr addition can densify the inner and outer rust layers, thereby reducing the corrosion rate of the welding rust layer.

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添加铬对高速列车转向架耐候钢焊缝金属的微观结构、机械性能和腐蚀行为的影响

研究了高速列车转向架使用的 Ni-Cu 合金中添加铬对含有 Ti 或 Mo 的两种焊接金属的微观结构、机械性能和腐蚀行为的影响。结果表明，在含 Ti 的焊缝中，铬能使针状铁素体 (AF) 增加约 15%，减少原生铁素体 (PF) 和第二相排列的铁素体 (FSP)，并略微增加 M-A 成分。添加铬几乎不会改变 AF，但会导致 PF 下降和 FSP 增加，并使含 Mo 的焊缝区中的 M-A 成分从 0.4% 大幅增加到 2.5%。同时还发现，由于 M-A 成分比例和尺寸的增加以及夹杂物的粗化，铬的添加对含 Mo 焊缝的焊接韧性产生了负面影响。在耐腐蚀性方面，铬的添加会促进夹杂物表面对铬的吸收。这是含 Mo 的焊缝初始腐蚀速率降低的主要原因，而这种影响在含 Ti 的焊缝中有所减弱。此外，添加 Cr 还能使内外锈层致密化，从而降低焊接锈层的腐蚀速率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Welding in the World METALLURGY & METALLURGICAL ENGINEERING-

CiteScore

4.20

自引率

14.30%

发文量

181

审稿时长

6-12 weeks

期刊介绍： The journal Welding in the World publishes authoritative papers on every aspect of materials joining, including welding, brazing, soldering, cutting, thermal spraying and allied joining and fabrication techniques.