稀土元素Ce对X80管线钢DWTT性能影响研究

Study on Effects of Rare Earth Element Ce on DWTT(Drop Weight Tear Test)Properties of X80 Pipeline Steel

文章以X80管线钢为研究对象,在实验室开展稀土元素Ce对管线钢DWTT性能影响研究。研究结果表明,稀土元素Ce的添加有利于提高试验钢的低温韧性,-40℃时添加稀土元素Ce后的试样冲击功达到210 J,与未添加稀土的试样相比增幅达到19.3%。添加稀土元素Ce有利于降低管线钢的韧脆转变温度。不添加稀土元素的试样焊后热影响区的冲击功为189 J,添加稀土元素Ce后的试样热影响区冲击功达到216 J,增幅为14.3%。

In this paper,the effects of rare earth element Ce on DWTT properties of pipeline steel are studied in laboratory by taking X80 pipeline steel as the research object.The study results showed that the addition of rare earth element Ce could help to improve the low temperature toughness of test steel.The impact energy of sample after adding rare earth element Ce could reach 210 J at-40℃,which is increased by 19.3%compared with that of sample without adding rare earth.The addition of rare earth element Ce could help to reduce the ductile-brittle transition temperature of pipeline steel.The impact energy of heat affected zone after welding for sample without adding rare earth element is 189 J and the impact energy of heat affected zone for sample after adding rare earth element Ce could reach 216 J,which is increased by 14.3%.