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温度和应变率对SLM 3D打印SS316L中的塑料变形的协同作用机制,使用热处理地图分析
Ambuj Saxena1, Shashi Prakash Dwivedi2, Shubham Sharma3,4,5
1Department of Mechanical Engineering, G. L. Bajaj Institute of Technology and Management, Greater Noida, 201306, India.
Scientific reports
|May 9, 2025
概括
本研究分析了3D打印SS316L钢的热加工性,通过检查各种温度和拉伸率的塑料变形行为来确定安全加工区. 为选择性激光化 (SLM) 应用确定了最佳参数.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 添加剂制造 添加剂制造 添加剂制造
背景情况:
- 选择性激光化 (SLM) 是生产SS316L钢件的关键增材制造技术.
- 了解SLM SS316L钢在各种条件下的塑性变形行为对于优化其热加工能力至关重要.
- 以前的研究还没有完全描述温度和拉伸率对SLM SS316L钢的机械性能和微观结构的复杂相互作用.
研究的目的:
- 为了研究SLM 3D打印SS316L钢的塑性变形行为,其温度范围从25°C到1000°C,应变速率从10−3s−1到103s−1.1,应变速率从10−3s−1到103s−1.
- 根据应变率灵敏度,耗电效率和不稳定性参数构建和分析热加工加工图.
- 通过将加工图与微观结构观测联系起来,确定热加工SLM SS316L钢的安全和不安全操作区域.
主要方法:
- 在SLM 3D打印的SS316L钢样本上进行了压缩负荷测试,其温度和拉伸率范围广泛.
- 分析了流应力-塑料应变数据,以确定温度和应变速率对材料行为的影响.
- 计算了应变率灵敏度 (m),耗电效率 (η) 和不稳定性参数 (ξ) 来生成处理图.
主要成果:
- 流应力随着温度的增加而显著降低,并在室温下随着应变率的增加而降低,而在1000°C时随着应变率的增加而增加.
- 处理地图显示了与不稳定性 (不安全区域) 相关的特定温度和应变速率范围,特别是在低和高的应变速率和中间温度 (200-400°C,800-1000°C) 中.
- 维克尔的硬度随着温度的增加而大幅下降,这表明在高温下有软化作用.
结论:
- 该研究成功地划分了热加工SLM SS316L钢的安全和不安全区域,为流程优化提供了关键数据.
- 这些发现突出了温度和拉伸率对3D打印SS316L钢的塑性变形和可加工性的重大影响.
- 生成的加工图为工程师选择最佳热工作参数的宝贵工具,确保材料完整性和性能.
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