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ATOMIC DIFFUSION CONTROL DURING TEMPERING OF STEEL 20Cr11MoVNbNB

FU Changpu HAN Yong Shaanxi Mechanical Engineering Institute , Xi'an , China FU Changpu , associate professor , Department of Materials Engineering , Shaanxi Mechanical Engineering Institute , Xi'an 710048 , China

金属学报(英文版)

Studies were made of the effect of tempering at temperatures from 25 to 750℃ for 0.5 to 100 h on changes of hardness,precipitated phase and its alloying element content as well as activation energy of tempering for quenched steel 20Cr11MoVNbNB.Tempering of the steel at temperatures below 400℃ may be controlled by the diffusion of C atoms in α-Fe,and above 400℃,by diffusion of Cr,also Mo or V,in α-Fe.

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

ON THE SWERVING OF STRENGTH CURVE FOR STEEL 20Cr11MoVNbNB

FU Changpu ZHA NG Jinwang Shaanxi Mechanical Engineering Institute , Xi′an.ChinaPAN Jingda D U Wenfeng Beijing Heavy Electric Machine Works , Beijing , China

金属学报(英文版)

Study was made on the swerving of the curves of strength and hardness vs L-M parameter P=T(20+lgt)for steel 20Crl 1MoVNbNB aged at 550.600 and 650℃ for 0—5000 h,T being aging temperature in K and taging time in h.The swerving seems to be due to:(1)the coarsening of the mean size of principal precipitate M_(23)C_6,(2)the precipitation of Laves phase MoFe_2;(3)the decrease of Mo content in matrix and(4)the recovery and recrystallization of the matrix phase.

关键词: L-M parameter , null , null , null , null

20Cr11MoVNbNB钢蠕变孔洞及蠕变裂纹的研究

符长璞 , 符亚林 , 陈宇航

金属学报

研究了20Cr11MoVNbNB马氏体热强钢在550—65℃范围内蠕变孔洞的形成及蠕变裂纹的发展发现蠕变孔洞主要在原奥氏体晶界和原板条马氏体边界上的淬火未溶大颗粒Nb（C，N）及M23C6碳化物处形成，孔洞在原奥氏体晶界形成倾向不占优势：蠕变裂纹沿垂直应力方向横穿原奥氏体晶界及原板条马氏体边界向晶内扩展，最终导致穿晶断裂.

关键词: 20Cr11MoVNbNB钢 , creep cavity , creep crack , transgranular fracture

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