摘要
通过热处理和热模拟试验研究控冷终止温度对钒氮微合金化500MPa级高强钢筋组织及相变的影响。利用热膨胀仪、金相分析、扫描电镜和硬度测试分析了实验钢筋的相变点和不同控冷终止温度时的组织和硬度。结果表明：控冷终止温度在700℃时，实验钢筋心部铁素体的晶粒尺寸最小，且心部组织的维氏硬度最高。综合分析控冷终止温度对试样组织形貌和硬度的影响，控冷终止温度在680～700℃对实验钢筋强度和塑韧性最有利。
The effects of final temperature of control cooling process on the microstructure and phase transformation of 500MPa high strength rebar produced by VN micro-alloying and controlled rolling and cooling technology were investigated based on the heat treatment and thermal simulation experiments. The phase transformation point, the microstructure and har dness under different final cooling temperature were analyzed using thermal expansion instrument, metallographic analysis, SEM and hardness test. The results indicate that the grain size of microstructure is smallest with 9. lum, and the Vickers hardness of the microstructure is highest, when the final cooling temperature is 700℃. Through comprehensive analysis of the effect of final cooling temperature on hardness and grain size and morphological variations of tested specimen, the best regime creating accepted mechanical properties of the specimen can be obtained at the final cooling temperature of 680℃-700 ℃.
出处
《热加工工艺》
CSCD
北大核心
2013年第20期210-213,共4页
Hot Working Technology
基金
国家自然科学基金资助项目(51261009)
昆明理工大学校人才项目(14118575)
