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微结构在Ni/Fe接口上的演变在铁钢和奥氏体不钢之间的不相似金属接中
Xiaogang Li1, Junfeng Nie1, Xin Wang1
1Institute of Nuclear and New Energy Technology, Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education, Tsinghua University, Beijing 100084, China.
Materials (Basel, Switzerland)
|September 28, 2023
概括
研究了不同金属接 (DMW) 中的Ni/Fe接口上的微结构演变. 接后的热处理改变了马氏体结构,可能降低接性能.
科学领域:
- 金与材料科学 金与材料科学
- 接工程 接工程
- 材料的特性 材料的特性
背景情况:
- 铁素钢和奥氏体不钢之间的不相似金属接 (DMW) 在许多工业应用中至关重要.
- 了解Ni/Fe接口微结构对于预测接性能和防止故障至关重要.
- 接口上的马石变化可以显著影响机械性能.
研究的目的:
- 研究DMW中Ni/Fe接口上的微结构的形成和演变.
- 为了澄清接过程中界面马石层形成的机制.
- 分析接后热处理 (PWHT) 过程中的微观结构变化及其对机械性能的影响.
主要方法:
- 扫描电子显微镜 (SEM) 的使用
- 电子背散散射衍射 (EBSD) 是一种电子背散散射的方法.
- 电子探针微分析 (EPMA) 技术
- 聚焦的离子束 (FIB)
- 传输电子显微镜 (TEM) 的使用
- 能量分散式X射线 (EDX) 技术
- 传输基库奇衍射 (TKD) 是一种传输基库奇衍射.
- 阶段图 阶段图 阶段图
- 理论分析 理论分析
主要成果:
- 作为接的DMW在Ni/Fe接口上呈现出BCC灭的马氏体层和FCC部分混合区 (PMZ).
- PWHT诱导了BCC马氏石层的演变,成为钢化和新形成的马氏石的双层结构.
- 这些马氏体结构导致了Ni/Fe接口的不均的硬度分布和机械性能不匹配.
结论:
- 在接过程中形成界面马氏体结构及其在PWHT过程中的演变是影响DMW性能的关键因素.
- 在Ni/Fe接口上的不均硬度和机械性能不匹配可能导致接降解和故障.
- 需要进一步的研究来缓解这些微结构问题,并提高DMW的可靠性.
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