HUANG Jun-xia
,
YE Xiao-ning
,
XU Zhou
钢铁研究学报(英文版)
The microstructure and mechanical properties evolution of AISI 301LN metastable austenitic stainless steels during cold rolling were investigated. A wide range of cold thickness reduction (10%-80%) was carried out in a four-high rolling mill at ambient temperature. The X-ray and Feritscope MP30 were used to identify the strain-induced α′-martensite phase and its volume fraction, respectively. The microstructure was observed by optical micrograph and the mechanical properties were determined by tensile tests and microhardness. The results show that the strain-induced α′-martensite nucleated at the shear bands intersections and the growth of α′-martensite occurred by the repeated nucleation of new embryos. The volume fraction of strain-induced α′-martensite increased with increasing the cold rolling reduction. In addition, the percentage increased in the tensile strength is the same as that of hardness. The ratio between the average tensile strength and the average microhardness was found to range between 2.82 and 3.17.
关键词:
metastable austenitic stainless steel
,
cold rolling
,
reduction
,
strength
袁鹏举，，吴迪，付常伟，赵宪明，霍喜伟
钢铁
阐述了轧材超快速冷却机制，利用东北大学试验装置对H型钢进行了超快速冷却试验研究，重点分析了莱钢Q235B，Q345B钢种轧后不同冷却速度、不同冷却方式对轧材组织和性能影响规律。试验表明：使用单段式冷却，冷速达到444.4℃/s时，屈服强度可提高205MPa；使用两段式冷却，一次冷却和二次冷却的冷速分别为385和297℃/s时，屈服强度可提高230MPa。2种冷却方式均能大幅度提高轧材强度，两段式冷却效果明显高于单段式冷却，为实现低成本生产H型钢及生产更高级别高强钢提供了技术支持。
关键词:
超快速冷却
,
intensity of cooling
,
strength
