新型不锈钢覆层钢筋力学性能试验研究

钟小平; 倪克挺; 黄歆瑶; 张军; 樊玮洁; 朱炳喜; 张瑞; 柴京奥

doi:10.3724/j.gyjzG24110701

新型不锈钢覆层钢筋力学性能试验研究

doi: 10.3724/j.gyjzG24110701

1. 扬州大学建筑科学与工程学院, 江苏扬州 225127;
2. 浙大宁波理工学院, 浙江宁波 315100;
3. 江苏省水利科学研究院, 江苏扬州 225002

基金项目:

国家自然科学基金项目（52178171，51678513）；江苏省水利科学研究院科技项目（2022Z034）。

详细信息

作者简介:
钟小平，工学博士，教授，主要从事混凝土结构耐久性及性能提升技术等方面的研究。电子信箱：zhongxiaoping@zju.edu.cn

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出版历程
- 收稿日期: 2024-11-07

Experimental Research on Mechanical Properties of Novel Stainless Steel-Clad Rebars

1. College of Civil Science and Engineering, Yangzhou University, Yangzhou 225127, China;
2. School of Civil Engineering and Architecture, NingboTech University, Ningbo 315100, China;
3. Jiangsu Water Conservancy Science Research Institute, Yangzhou 225002, China

摘要

摘要: 为了获得结构设计所需的力学性能指标，采用扫描电镜（SEM）及单轴拉伸试验方法，研究了新型316SC不锈钢覆层钢筋复合界面的金相组织变化及力学性能。结果表明：不锈钢覆层钢筋复合界面存在一个15 μ左右的冶金结合层，外层不锈钢与内芯碳钢之间冶金结合紧密；不同直径的不锈钢覆层钢筋表现出不同的应力-应变曲线形状，直径12 mm的不锈钢覆层钢筋屈服平台消失，而直径16 mm和25 mm的力学性能与HRB400E钢筋相似，应力-应变曲线中有明显的屈服平台和应变强化段；316L不锈钢与HRB400E碳钢复合而成的316SC不锈钢覆层钢筋，其强度和延性在HRB400E钢筋基础上有不同程度的提高，但弹性模量有小幅降低。在试验研究及理论分析的基础上，建立了不锈钢覆层钢筋的应力-应变本构模型，给出了不锈钢覆层钢筋弹性模量复合计算公式，公式计算值与实测值吻合较好。
- 不锈钢覆层钢筋 /
- 单调拉伸 /
- 断口形貌 /
- 力学性能 /
- 弹性模量
Abstract: In order to obtain the mechanical properties required for structural design，the metallographic structure evolution and mechanical properties of the composite interface of novel 316SC stainless steel-clad rebar were studied using scanning electron microscopy （SEM） and uniaxial tensile tests. The results showed that a metallurgical bond layer of approximately 15 μm formed at the composite interface of the stainless steel-clad rebar， with a tight bond between the outer stainless steel layer and the inner carbon steel core. The stainless steel-clad rebars with different diameters exhibited varying stress-strain curve shapes. The yield platform disappeared in the 12 mm diameter stainless steel-clad rebar， whereas the 16 mm and 25 mm diameter rebars displayed mechanical properties similar to those of HRB400E rebars， with obvious yield platforms and strain-strengthening sections in their stress-strain curves. The strength and ductility of 316SC stainless steel-clad rebars， composed of 316L stainless steel and HRB400E carbon steel， were improved to varying degrees compared to HRB400E rebars， but the elastic modulus decreased slightly. On the basis of experimental research and theoretical analysis， the stress-strain constitutive model of stainless steel-clad rebars was established. A composite formula for calculating the elastic modulus of stainless steel-clad rebars was also proposed， showing good agreement with the measured values.
- stainless steel-clad rebar /
- monotonic tension /
- fracture morphology /
- mechanical properties /
- elastic modulus

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