退火温度对含Nb高锰钢力学和阻尼性能的影响  

Influence of Annealing Temperature on Both Mechanical and Damping Properties of Nb-Alloyed High Mn Steel

作　　者：王玉 胡斌 刘星毅 张浩[1] 张灏云 官志强 罗海文[1] WANG Yu;HU Bin;LIU Xingyi;ZHANG Hao;ZHANG Haoyun;GUAN Zhiqiang;LUO Haiwen(School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083

出　　处：《金属学报》2021年第12期1588-1594,共7页Acta Metallurgica Sinica

基　　金：国家自然科学基金项目Nos.51831002,51861135302和51904028;中央高校基本科研业务费专项基金项目Nos.FRF-TP-18-002C2,FRF-DRY-19-013和06500151。

摘　　要：研究了含Nb高锰阻尼钢热轧后在750~1050℃区间退火后的组织、力学性能和阻尼性能。热轧时发生不均匀动态再结晶,形成轧向带状再结晶组织及带状之间的取向单一、大块状ε马氏体,后者在850℃以下退火不发生再结晶、950℃部分再结晶和1050℃时完全再结晶。未再结晶奥氏体冷却时相变为高密度位错大块状ε马氏体;而再结晶形成众多细小奥氏体晶粒后转变为取向不同的、位错少的细小片层状ε马氏体和残余奥氏体。因此,退火温度增加导致阻尼性能改善但强度下降,而950℃退火的部分再结晶样品则兼具高阻尼性能和高强度,因为再结晶与未再结晶奥氏体相变产物分别贡献了阻尼和力学性能。因此,通过调整Nb合金化和退火工艺来控制高锰钢奥氏体的再结晶程度,可实现力学和阻尼性能的不同程度配合。In the engineering design of machines and vehicles,the technologies involving vibration and noise reduction receive considerable attention as they can prevent undesirable fatigue failures and offer more comfort to the users.Compared with other damping alloys,high Mn steel has been intensively studied because its high strength and excellent damp capacity can be achieved simultaneously at a low cost.Particularly,it has a strong potential of circumventing the long-existing trade-off of strength and damping capacity for more applications in the new circumstance.In this study,the microstructures and damping and mechanical properties of a novel hot-rolled Nb-alloyed high Mn steel annealed at the temperature range of 750-1050 ℃ were investigated.Heterogeneous recrystallization occurred during hot rolling,resulting in the formation of recrystallized bands along the rolling direction,in which fine lamellar εmartensite grains were interwoven with austenite;the coarse unrecrystallized ε martensite blocks were located between the bands.The latter was reversely transformed to the coarse austenite with a single orientation,remained unrecrystallized,and transformed back to the coarse highly-dislocated ε martensite blocks during the annealing below 850 ℃.Conversely,the ε martensite blocks reversely transformed the austenite grains partially and completely recrystallized to form even more refined grains with multiorientations during annealing at 950 and 1050 ℃,respectively.Thus,the recrystallized austenite grains transformed to fine ε lamellar martensite,and the austenite grains were retained with multi-orientations,both having a low density of dislocation.Consequently,the higher annealing temperature led to higher damping capacity but lower strength;whereas,the partial recrystallization occurring during annealing at950 ℃ resulted in the best combination of mechanical and damping properties.Therefore,this indicates that tailoring the extent of recrystallization via the Nb-alloying and annealing process for high Mn st

关 键 词：高锰钢 退火温度 Ε马氏体 力学性能 阻尼性能 

分 类 号：TG135.7[一般工业技术—材料科学与工程]