TMCP工艺轧制桥梁用不锈钢复合板的组织与性能

为了获得桥梁用不锈钢复合板良好的综合性能,采用控轧控冷(thermal mechanical control process,简称TMCP)工艺轧制了桥梁用不锈钢复合板316L+Q370qD,利用金相、扫描、拉伸、冲击、弯曲、剪切和晶间腐蚀等手段研究了该复合板的组织与性能。结果表明,316L+Q370qD桥梁用不锈钢复合板的界面实现了完全冶金结合,未发现孔洞、裂纹等缺陷以及大颗粒的析出物及氧化物夹杂等;复合板的屈服强度为421~446MPa,伸长率为24.0%~28.0%,-20℃纵向冲击吸收能量平均值为200J,180°内、外弯曲合格,平均剪切强度为412 MPa,复合板的各项力学性能均满足GB/T 8165—2008《不锈钢复合钢板和钢带》标准要求。按照GB/T 4334—2008方法 E进行晶间腐蚀试验,复层不锈钢316L未出现晶间腐蚀现象,具有良好的耐晶间腐蚀性能。

Microstructures and properties of stainless steel clad plate used for bridge rolled by thermal mechanical control process

In order to obtain good comprehensive performance of the stainless steel clad plate for bridge，thermal mechanical control process was used to produce the stainless steel clad plate 316L＋Q370qD used for bridge，and the microstructures and properties of this stainless steel clad plate were investigated by means of metallographic microscope，scanning electron microscope（SEM），tensile，impact，bend，shear and intergranular corrosion tests. The results showed that the complete metallurgical combination without voids，cracks，large particle precipitates and inclusions was found in the interface of the stainless steel clad plate 316L＋Q370qD. The yield strength of the stainless steel clad plate was between 421 and 446 MPa，and the elongation was between 24% and 28%. The average of longitudinal impact absorption energy at －20 ℃ was about 200 J，and 180° internal and external bending tests were qualified，and the shear strength of stainless steel clad plate was average at 412 MPa. All the mechanical properties of this stainless steel clad plate 316L＋Q370qD used for bride met the requirements of national standard GB/T 8165—2008. There was no intergranular corrosion found in the cladding stainless steel 316L tested in accordance with method E of national standard GB/T 4334—2008，so the cladding stainless steel 316L of 316L＋Q370qD had good resistance to intergranular corrosion.