铜在气体屏蔽固体电线中的作用对X80管道钢的微观结构演变和冷性性
Leng Peng1,2, Rui Hong1,2, Qi-Lin Ma2
1Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming 650000, China.
Materials (Basel, Switzerland)
|August 14, 2025
概括
将铜 (Cu) 添加到气体屏蔽固体电线中,可以显著降低X80管道钢的低温性. 增加的Cu含量削弱了无环铁核,导致低温性能较差.
科学领域:
- 材料科学 材料科学 材料科学
- 金工业是金工业的一个方面.
- 接工程 接工程
背景情况:
- 对于苛刻的应用,X80管道钢需要强大的接.
- 低温性对于在低温环境中运行的管道至关重要.
- 了解接金属的微观结构演变是提高机械性能的关键.
研究的目的:
- 系统地评估气体屏蔽固体电线中的铜 (Cu) 含量对X80管道钢接的微观结构和冷性的影响.
- 为了阐明微观结构机制,负责变化的性与不同的度Cu.
- 为优化接线组成提供见解,以提高低温性能.
主要方法:
- 气体金属弧接 (GMAW) 用于制造具有受控Cu添加 (0.13-0.34重量%) 的接.
- 机械性能通过拉力测试,在-20°C下进行Charpy V-notch撞击测试和维克斯硬度测量进行了评估.
- 使用光学显微镜 (OM),扫描电子显微镜 (SEM) 和电子反射散射衍射 (EBSD) 进行了微结构性表征.
主要成果:
- 将含量从0.13重量%增加到0.34重量%,使得酸铁 (AF) 的体积减少了20%左右.
- 低温性显著下降,平均冲击能量从221.08 J下降到151.59 J.
- 添加精炼了先前的奥氏体颗粒大小,增加了颗粒边界面积,并削弱了颗粒内的AF核.
结论:
- 接线中的较高铜含量会对X80管道钢的冷性产生不利影响.
- 观察到的性下降归因于减少了针状铁形成和改变了粒度边界特征.
- 优化含量对于在低温管道应用中保持接完整性至关重要.
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