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对不同成分的低Si连续TRIP钢的力学性能进行研究。研究发现,采用以Al代Si的思路来开发低Si连续退火TRIP钢是可行的,但是对成分中C和Si的含量有一定要求,其成分体系满足0.20%C-0.50%Si才能满足780MPa级TRIP钢对性能要求。在对力学性能研究的基础上,利用彩色金相、扫描电镜、透射电镜等方法对0.20%C-0.50%Si系TRIP钢微观组组织进行了观察。发现与传统高Si系TRIP钢相比,这种低Si含Al的TRIP钢其铁素体晶粒偏大,而残余奥氏体分布则没有显著差异。
The mechanical properties of low Si continuous TRIP steels with different compositions were studied. It is feasible to develop low Si continuous annealed TRIP steel based on the idea of Al-Si. However, the content of C and Si in the composition is required, and the composition system satisfies 0.20% C-0.50% Si to meet the requirement of 780MPa grade TRIP steel performance requirements. Based on the study of mechanical properties, the microstructure of 0.20% C-0.50% Si TRIP steel was observed by means of color metallography, scanning electron microscopy and transmission electron microscopy. It is found that the ferrite grains of this low Si Al-containing TRIP steel are larger than those of the conventional high-Si TRIP steel, while the residual austenite distribution is not significantly different.