热处理工艺对30MnSi PC钢棒耐延迟断裂性能的影响  

Effect of Heat Treatment on Delayed Fracture Resistance of 30MnSi Pre-Stressed Concrete Steel Bar

作　　者：肖桂枝[1] 邸洪双[1] 

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110004

出　　处：《钢铁》2008年第1期68-72,共5页Iron and Steel

基　　金：国家自然科学基金资助项目(50474015);教育部博士点基金(20050145021)

摘　　要：对30MnSi PC钢棒进行了淬火回火处理,分析探讨了热处理工艺对高强度钢耐延迟断裂性能的影响。采用FIP试验作为PC钢棒耐延迟断裂性能的评价方法。研究发现,相同的回火工艺下30MnSi钢的耐延迟断裂性能随淬火温度的升高呈先升高后降低的趋势,950℃左右淬火其耐延迟断裂性能较好;在保证强度满足要求的前提下提高回火温度可以提高钢的耐延迟断裂性能。组织观察发现,经430℃左右回火后,30MnSi钢棒得到的回火索(屈)氏体组织均匀细小,碳化物弥散分布在马氏体板条界上,耐延迟断裂性能较好。可见,通过改变热处理制度改变组织形态,是改善30MnSi钢的耐延迟断裂性能的一种有效途径。In order to analyze and investigate the effect of heat treatment on delayed fracture resistance of 30MnSi PC steel bars FIP test was adopted. FIP test results show that the delayed fracture resistance of 30MnSi steel bar rises with quenching temperature under same tempering temperature. The steel bar quenched at 950 ℃have good delayed fracture resistance. It was observed that the delayed fracture resistance of 30MnSi steel bars increases with tempering temperature at a sufficient strength. Microstructuraf observation showed that the structure of 30MnSi steel bar after tempering at about 430 ~C ,which has good delayed fracture resistance is mainly composed of fine tempered sorbite （troostite） with carbide distributed along the lath martensite boundaries. It can be concluded that heat treatment is an effective way to improve delayed fracture of 30MnSi steel bar.

关 键 词：PC钢棒 延迟断裂 30MnSi 热处理 

分 类 号：TG162.8[金属学及工艺—热处理]