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Effects of Water Cooling Process on the Microstructure and Properties of Stainless Steel Clad Plates for Weathering Bridges
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摘要: 采用控轧控冷（TMCP）+弛豫+回火工艺开发生产了耐候桥梁用不锈钢复合板，研究了3种水冷工艺对复合板组织和性能的影响。结果表明：不同水冷工艺下，复合板基层碳钢组织均为粒状贝氏体+准多边形铁素体+珠光体；随着入水温度的降低，复合界面处基层的脱碳层变宽，基层中的先共析铁素体比例增加，强度降低，特别是屈服强度由572 MPa降至527 MPa，屈强比由0.87降至0.83；入水温度相同时，随着返红温度的降低，贝氏体转变更充分，抗拉强度由658 MPa提高至710 MPa，但屈服强度变化不大，从而降低屈强比，达到316L+Q500qENH的性能要求。Abstract: Stainless steel clad plates for weathering bridges were developed using thermo-mechanical control processing（TMCP） along with relaxation and tempering processes. The effects of three different water cooling processes on the microstructure and properties of clad plates were studied. The results showed that the microstructure of the carbon steel substrate consisted of granular bainite， quasi-polygonal ferrite， and pearlite under all tested water cooling conditions. As the water entry temperature decreased， the decarburized layer at the carbon steel substrate at the clad interface became wider， and the volume fraction of proeutectoid ferrite in the substrate increased， resulting in a decrease in strength， especially a reduction in yield strength from 572 MPa to 527 MPa， and then a reduction in yield ratio from 0.87 to 0.83. At a constant water entry temperature， a lower self-tempering temperature promoted a more complete bainitic transformation. This increased the tensile strength from 658 MPa to 710 MPa， while the yield strength remained largely unchanged， thereby reducing the yield ratio and meeting the performance requirements for the 316L+Q500qENH composite system.
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Key words:
- stainless steel clad plate /
- weathering bridge steel /
- water cooling process /
- microstructure /
- property
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