加工工艺对F/M钢包壳管组织与力学性能的影响  

Effects of Processing Technologies on Microstructures and Mechanical Properties of F/M Steel Cladding Tubes

作　　者：潘钱付[1] 赵勇 牛犇 卓洪[1] 邱绍宇[1] 吴裕[1] 刘超红[1] PAN Qianfu;ZHAO Yong;NIU Ben;ZHUO Hong;QIU Shaoyu;WU Yu;LIU Chaohong(Key Laboratory for Reactor Fuel and Materials,Nuclear Power Institute of China,Chengdu 610213,China;Key Laboratory of Materials Modification by Laser,Ion and Electron Beams(Ministry of Education),School of Material Science and Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]中国核动力研究设计院反应堆燃料及材料重点实验室,四川成都610213 [2]大连理工大学材料科学与工程学院三束材料改性教育部重点实验室,辽宁大连116024

出　　处：《热加工工艺》2021年第11期45-50,54,共7页Hot Working Technology

摘　　要：对锻造态铁素体/马氏体(F/M)钢进行了两种不同挤压比的挤压-不同道次冷轧实验,研究不同工艺对F/M钢管材微观组织及力学性能的影响。结果表明,经热挤压、退火后,两条工艺路线制备的F/M钢管材均为马氏体组织,且细小的碳化物粒子在马氏体基体上均匀分布。在多道次轧制、退火过程中,大变形量的管材发生完全再结晶,微观组织是铁素体晶粒;而小变形量的管材发生部分再结晶,微观组织由铁素体和板条马氏体构成;在相同道次冷轧和退火后,发生了完全再结晶的管材强度较低塑性高,只发生部分再结晶的管材表现出高强度和低塑性。经过相同的正火和回火后,两条工艺路线制备的成品管中马氏体板条宽度为200~300 nm,室温屈服强度为590~610MPa,550℃时屈服强度为330~350 MPa。The extrusion-cold rolling experiments of forged ferritic/martensitic(F/M) steel were carried out by two different processes with different extrusion vatio and rolling pass. The effects of different processes on the microstructure and mechanical properties of F/M steel tubes were studied. The results show that after hot extrusion and annealing, the F/M steel tubes prepared by the two processes are martensite, and the fine carbide particles are uniformly distributed on the martensite matrix. During the multi-pass rolling and annealing process, the tube with large deformation is fully recrystallized, and the microstructure is ferrite grain;while the tube with small deformation is partially recrystallized and the microstructure is composed of ferrite and lath martensite. After cold rolling with same pass and annealing, the completely recrystallized tube has lower strength and higher plasticity, and the partially recrystallized tube has high strength and low plasticity. After the same normalizing and tempering, the width of martensite lath in the finished tube prepared by the two processes is 200-300 nm, and the yield strength at room temperature is 590-610 MPa, the yield strength at 550℃ is 330-350 MPa.

关 键 词：铁素体/马氏体钢 加工工艺 挤压-冷轧 

分 类 号：TG376[金属学及工艺—金属压力加工] TG335.12