摘要
通过对一种商业用管线钢连续冷却相变曲线 (CCT)的测定 ,研究了过冷奥氏体的相变规律 .在分析显微组织形成规律的基础上 ,确定了能够在实验用钢中获得针状铁素体组织的控制热加工工艺 (TMCP)制度 ,即制定两阶段多道次控制轧制和冷却速度为 30℃ /s控制冷却的工艺制度 ,并利用力学试验及微观分析手段 ,进一步分析了针状铁素体组织的微观结构特征和力学性能 .结果表明 ,针状铁素体组织中彼此咬合的细小针状片条束。
The phase transformation of super cooled austenite was investigated for a commercial pipeline steel by measuring the continuous cooling transformation diagram (CCT). Based on the investigation on the formation of different microstructures, the thermo mechanical control process (TMCP) was decided to obtain acicular ferrite in the experimental steel, which was designed as a two stage controlled rolling followed by a controlled cooling with a cooling rate of 30 ℃/s. The microstructural characteristics and mechanical properties of the hot rolled steel were analyzed by means of mechanical testing and microstructural analysis. The experimental results showed that, in the microstructural characteristics of acicular ferrite the interwoven nonparallel ferrite laths, fairly high dislocation densities and fine dispersed precipitations can play important roles in the enhancement of strength and toughness of the material.
出处
《材料科学与工艺》
EI
CAS
CSCD
2001年第4期356-358,共3页
Materials Science and Technology
基金
国家 973新一代钢铁材料重大基础研究资助项目(G19980 6 15 11)
