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RELATIONSHIP BETWEEN CREEP PROPERTIES AND STRUCTURE OF STEEL 20Cr11MoVNbNB

FU Changpu HAN Yong , L(?) Shuangyun AN Yunzheng Shaanxi Mechanical Engineering Institute , Xi'an , ChinaPAN Jingda DU Wenfeng Beijing Heavy Electric Machine Works , China associate professor , Department of Materials , Shaanxi Mechanical Engineering Institute , Xi'an 710048 , China

金属学报(英文版)

Studies were made of the creep properties and structure change of steet 20Cr11MoVNbNB at 550-650℃.It is found that at 550℃ when creep stress>180 MPa there exists linear rela- tion with two different slopes β_1 and β-2 between transitional creep strain ε_β and creep time t~(1/3),and β_1(in initiol period)>β_2(in later period).The Creep rate of stable stage at 550℃ can be expressed by =Aσ exp(-Q_ /RT),where,n=4.7.A exp(-Q_ /RT)= 5.37×10~(-16).Apparent creep activation energy Q_ =430 kJ/mol at 550-650℃,which is much higher than the self-diffusion activation energy of atoms for matrix Fe.In creep process,as the creep stress and time increase,the total weight of precipitated phases and rela- tive weight of Cr,Mo and V increase,but those of Fe and Nb decrease in precipitated phases,

关键词: 20Cr11MoVNbNB , null , null , null , null

20Cr11MoVNbNB钢的蠕变性能与组织的关系

符长璞 , 憨勇 , 吕爽云 , 安运铮 , 潘景达 , 杜文峰

金属学报

研究了20Cr11MoVNbNB钢550—650℃的蠕变性能及组织的变化,发现在550℃,蠕变应力>180MPa时,过渡蠕变应变和蠕变时间的ε_β-ι~(1/3)关系中,呈现前期斜率β_1大于后期β_2的两段线性关系;550℃稳态蠕变速率可用■=Aσ~nexp(-Q_c/RT)来表示,其中n=4.7,Aexp(-Q_c/RT)=5.37×10_(-16);550—650℃的表观蠕变激活能Q_c=430kJ/mol,其值远大于基体Fe原子的自扩散激活能;发现在蠕变过程中,随蠕变应力和蠕变时间增加,沉淀相的总量和其中的Cr,Mo,V含量增加,Fe和Nb含量则下降。

关键词: 20CrIlMovNbNB , heat-resisting steel , creep , creep hardness , creep active energy

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