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在高温下研究低合金,高强度钢接金属的动态机械性能
Liang Song1, Yun Peng2, Haiyan Zhao1
1School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
Materials (Basel, Switzerland)
|April 24, 2025
概括
高强度钢的接金属特性在高温下降解,接接是最弱点. 热处理可以优化机械性能,但较高的热温度会降低强度并增加延长.
科学领域:
- 金工程 金工程 金工程
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
背景情况:
- 了解接金属的高温机械行为对于结构完整性至关重要.
- 像Q960E这样的低合金,高强度钢在需要强接的苛刻应用中使用.
- 接接往往代表接结构中的关键故障点.
研究的目的:
- 确定低合金,高强度钢在高温下接金属的动态机械性能.
- 模拟接过程中接金属的温度分布和热损失.
- 评估热处理对Q960E钢接和受热影响区域机械性能的影响.
主要方法:
- 开发了一种用于接金属热损失的稳定状态温度分布模型.
- 使用Q960E高强度钢挤出板用于实验性接.
- 进行了高温机械测试,并分析了热处理 (固体溶液+老化) 的影响.
主要成果:
- 接接被确定为接接头中最弱的区域.
- 收益率强度和拉伸强度随着温度的增加而下降.
- 固体溶液+老化处理优化了受热影响区域的特性.
- 大多数样本表现出短期高温耐受性 (600 °C/199 MPa, 650 °C/118 MPa).
- 增高的火温度 (从830°C) 显著降低了产量和抗拉强度,同时大幅增加了延长.
结论:
- 高温显著降低了Q960E钢接金属的机械性能.
- 热处理策略,特别是固体溶液+老化,可以提高接性能.
- 优化回火温度对于平衡高强度钢的强度和可塑性至关重要.
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