The impact toughness of a nitride-strengthened martensitic heat resistant steel  

作　　者：ZHANG WenFeng YAN Wei SHA Wei WANG Wei ZHOU QiangGuo SHAN YiYin YANG Ke 

机构地区：[1]Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016 [2]University of Science and Technology of China,Hefei 230026 [3]Graduate School of Chinese Academy of Sciences,Beijing 100049 [4]School of Planning,Architecture&Civil Engineering,Queen's University Belfast,Belfast BT95AG,UK

出　　处：《Science China(Technological Sciences)》2012年第7期1858-1862,共5页中国科学（技术科学英文版）

基　　金：supported by the National Basic Research Program of China (Grant No. 2010CB630800);the National Natural Science Foundation of China (Grant No. 51001102)

摘　　要：The nitride-strengthened martensitic heat resistant steel is precipitation strengthened only by nitrides.In the present work,the effect of nitride precipitation behavior on the impact toughness of an experimental steel was investigated.Nitrides could hardly be observed when the steel was tempered at 650℃.When the tempering temperature was increased to 700℃ and 750℃,a large amount of nitrides were observed in the matrix.It was surprising to reveal that the impact energy of the half-size samples greatly increased from several Joules to nearly a hundred Joules.The ductile-brittle transition temperature(DBTT) was also discovered to decrease from room temperature to 50℃ when the tempering temperature was increased from 650℃ to 750℃.The nitride precipitation with increasing tempering temperature was revealed to be responsible for the improved impact toughness.

关 键 词：nitride-strengthening MARTENSITE heat resistant steel PRECIPITATION DBTT impact toughness 

分 类 号：TG457.11[金属学及工艺—焊接] TG142.41[一般工业技术—材料科学与工程]