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层次的多个前体诱导了超奥氏体不钢的异质结构,通过冷滚动和化

Duo Tan¹, Bin Fu¹, Wei Guan¹

¹School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418, China.

Materials (Basel, Switzerland)

|September 28, 2023

概括

超奥氏体不钢 (SASS) 的冷制造产生了纳米双胞胎和马氏体. 这种异质结构 (HS) 通过协同硬化效应实现了卓越的强度和柔性.

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.
机械工程机械工程

背景情况:

超奥氏体不钢 (SASS) 对于苛刻的应用至关重要.
了解变形机制是提高SASS特性的关键.
之前的研究集中在传统的冷上,限制了微结构控制.

研究的目的:

研究冷滚动对SASS微观结构的影响.
分析异质结构 (HS) 的形成及其对机械性能的影响.
为了比较低温和传统的冷用于SASS加工.

主要方法:

超奥氏体不钢是使用77K的冷 (Cryo-R) 和293K的常规冷 (Cold-R) 来加工的.
微结构分析包括识别脱位细胞,纳米双胞胎 (NTs) 和马石.
通过拉力测试和应变硬化分析来评估机械性能.

主要成果:

Cryo-R引入了多个变形的基结构,如纳米双胞胎和马石纳米,与Cold-R不同,它只产生了位移.
从Cryo-R中得到的异质结构 (HS),包括双模奥氏体和保留的马氏体,表现出增强的屈服强度 (~1032MPa) 和拉伸延伸 (~9.1%).
在回火过程中,再结晶和逆转化之间的竞争导致了HS的形成.

结论:

低温滚动是一种有效的方法,可以在SASS中创建异构的微结构.
通过 Cryo-R 实现的 HS 与传统冷 SASS 相比,显示出优越的强度-柔性平衡.
谷物精炼,脱位和异形变形诱导硬化的协同效应是提高机械性能的原因.

关键词:

低温冷滚动制冷滚动不同质结构不同质结构.机械性能机械性能机械性能微观结构的微观结构超级奥氏体不钢超级奥氏体不钢

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