12Cr1 MoV钢连续冷却过程中P的晶界偏聚  

Segregation of P at Grain-boundary of 12Cr1MoV Steel in Continuous Cooling Process

作　　者：杨尚林[1] 李莉[1] 田无边[1] 杨亚卓 李庆芬[1] 

机构地区：[1]哈尔滨工程大学机电工程学院,黑龙江哈尔滨150001

出　　处：《材料热处理学报》2003年第4期33-36,83,共4页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金资助 (59971 0 4 2 ) ;国防科工委基础研究资助 (J1 60 0E0 0 1 )

摘　　要：采用分步冷却工艺 ,研究了连续冷却过程中 12Cr1MoV钢中P的非平衡晶界偏聚过程 ,实际测得在 813K恒温 4 5h时 ,P在晶界的偏聚量为 4 1at% ,相应的理论计算等效时间te(813K) =4 2 5 5 8h时 ,P在晶界的偏聚量为 4 4at% ,表明实验结果与理论计算值相吻合。从而说明晶界偏聚的等效时间理论能很好地解释分步冷却工艺中P的非平衡晶界偏聚动力学和分步冷却工艺加速脆化的机理。By step cooling process, the non-equilibrium segregation process of P at grain-boundary of 12Cr1MoV steel in continuous cooling process is investigated. The measured value of segregation of P at grain-boundary is 4\^1 at % for the steel at 813K isothermal holding 45h, and the corresponding calculated result is 4\^4 at % while the effective time is 42\^558h. The results show that the experimental data accords with the calculated result. This indicates the theoretic segregation model at grain-boundary can be used to explain the dynamical segregation process of P at grain-boundary in step cooling process and the mechanism of accelerating embrittlement of step cooling.

关 键 词：分步冷却 连续冷却 晶界偏聚 等效时间 临界时间 

分 类 号：TG142.1[一般工业技术—材料科学与工程]