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钛/钢复合板具有良好的耐蚀性和较低的成本，但其较差的综合力学性能限制了其应用范围的拓展，如何提升其综合性能成为研究热点。研究了不同退火温度对预制波纹轧制的钛/钢复合板界面不同位置的微观组织和力学性能的影响。结果表明：随着退火温度的升高，界面处Fe和Ti元素跨界面的扩散距离不断增加，C元素向界面集中，这一现象促进了TiC颗粒的形核与长大，同时，(α-Ti+β-Ti)层的厚度不断增加，值得注意的是，波峰处的元素扩散行为和组织转变特征与其他位置存在显著差异；随着退火温度的升高，钢侧基材位错密度显著降低和再结晶晶粒显著增多，钢侧和钛侧小角度晶界减少，大角度晶界增多；退火温度的升高促使钢侧基材内马氏体数量锐减，因此复合板延展性提升，抗拉强度降低；当在750℃退火时，生成的脆性金属间化合物严重削弱了界面结合强度；在550℃退火时，复合板的综合力学性能最佳，抗拉强度为625 MPa,总伸长率为25.2%,剪切强度为291 MPa。
Abstract：Titanium/steel composite plate has good corrosion resistance and relatively low cost, but its poor comprehensive mechanical properties limit the expansion of its application range. How to improve its comprehensive properties has become a research hotspot. The effect of different annealing temperatures on microstructure and mechanical properties at different positions of the interface of pre-corrugated rolled titanium/steel composite plate was studied. The results show that with the increase of annealing temperature, the diffusion distance of Fe and Ti elements across the interface increases, C elements concentrate at the interface, which promotes the nucleation and growth of TiC particles, and the thickness of(α-Ti+β-Ti) layer increases. It is worth noting that the element diffusion behavior and microstructure transformation characteristics at the wave peak are significantly different from those at other positions. With the increase of annealing temperature, the dislocation density of the substrate on the steel side decreases significantly and the recrystallized grains increases significantly, the small angle grain boundaries on the steel side and titanium side decrease, and the large angle grain boundaries increase. With the increase of annealing temperature, the amount of martensite in the steel side substrate decreases sharply, so the ductility of the composite plate increases and the tensile strength decreases. When annealed at 750 ℃, the brittle intermetallic compounds formed seriously weaken the interfacial bonding strength. When annealed at 550 ℃, the composite plate has the best comprehensive mechanical properties, with tensile strength of 625 MPa, total elongation of 25.2%, and shear strength of 291 MPa.
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基本信息:
DOI：10.13289/j.issn.1009-6264.2024-0594
中图分类号:TG156.2
引用信息:
[1]冯莹莹,单杰,廖宏义,等.退火温度对预制波纹轧制钛/钢复合板组织和性能的影响[J].材料热处理学报,2025,46(10):1-11.DOI:10.13289/j.issn.1009-6264.2024-0594.
基金信息:
国家自然科学基金(52105322)