Effects of Phosphorus Grain Boundary Segregation and Hardness on the Ductile-to-Brittle Transition for a 2.25CrMo Steel  

作　　者：宋申华 

机构地区：[1]Department of Materials Science and Engineering, Shenzhen Graduate School, Harbin Institute of Technology

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2007年第1期1-6,共6页武汉理工大学学报（材料科学英文版）

基　　金：Funded partly by the National Natural Science Foundation of China (No. 50331020).

摘　　要：The combined effect of phosphorus grain boundary segregation and hardness on the ductile-to-brittle transition was examined for a P-doped 2.25CrlMo steel by using Auger electron spectroscopy in conjunction with hardness measurements, Charpy impact tests and scanning electron microscopy. With prolonging time at 540 ~C after water quenching from 980℃, the segregation of phosphorus increases and the hardness decreases. The DBTT （FATT） increases with increasing phosphorus segregation and decreases with decreasing hardness. The effect of phosphorus segregation is dominant until 100 h aging and after that the hardness effect becomes dominant. This effect makes the DBTT （FATT） decrease with further prolonging ageing time although the segregation of phosphorus still increases strongly.The combined effect of phosphorus grain boundary segregation and hardness on the ductile-to-brittle transition was examined for a P-doped 2.25CrlMo steel by using Auger electron spectroscopy in conjunction with hardness measurements, Charpy impact tests and scanning electron microscopy. With prolonging time at 540 ~C after water quenching from 980℃, the segregation of phosphorus increases and the hardness decreases. The DBTT （FATT） increases with increasing phosphorus segregation and decreases with decreasing hardness. The effect of phosphorus segregation is dominant until 100 h aging and after that the hardness effect becomes dominant. This effect makes the DBTT （FATT） decrease with further prolonging ageing time although the segregation of phosphorus still increases strongly.

关 键 词：SEGREGATION grain boundary high strength low alloy steel EMBRITTLEMENT FRACTURE 

分 类 号：TG111[金属学及工艺—物理冶金]