氮对Mn18Cr18N护环钢高温力学性能的影响  

Effect of Nitrogen on Mechanical Properties of Retaining Ring Steel Mn18Cr18N at High Temperature

作　　者：陈慧琴[1] 刘建生[1] 郭会光[2] 

机构地区：[1]北京航空材料研究院,北京100095 [2]太原科技大学,太原030024

出　　处：《特殊钢》2005年第6期20-22,共3页Special Steel

摘　　要：护环是汽轮发电机的重要部件.用Gleeble-1500热模拟试验机研究了成分(%)为:(1) 0.53C-16.98Mn-3.17Cr,(2) 0.12C-19.57Mn-19.27Cr-0.60N和(3) 0.06C-18.58Mn-19.15Cr-0.69N 3种护环钢在800～1 200 ℃的高温变形应力-应变曲线以及含N护环钢的高温塑性-断面收缩率.结果表明,随钢中氮含量的增加,动态再结晶需要的临界变形量越大,相应的变形抗力逐渐增大;含N钢在1 050 ℃塑性最大,高温塑性随钢中氮含量的增加而减小,因此改善变形方式以提高工艺塑性是防止热裂,提高护环质量的有效途径.The retaining ring is an important component of turbogenerator. The high deformation stress-strain curves of three kind of retaining ring steel-0.53C-16.98Mn-3.17Cr（1）, 0.12C-19.57Mn-19.27Cr-0.60N（2） and 0.06C-18.58Mn-19.15Cr-0.69N（3） and the high temperature plasticity-reduction of area of containing nitrogen retaining ring steel at temperature 800～1200℃ have been studied by Gleeble-1500 thermal simulation machine. The results showed that with increasing nitrogen content in steel, the critical deformation value for dynamic recrystallization increased in order to gradually increase corresponding deformation force ; the maximum reduction of area of containing nitrogen steel was at 1050℃, and the high plastic deformation region shrunk with increasing nitrogen content in steel. Therefore modifying deformation model to increase process plasticity is an available way to increase the quality of retaining ring.

关 键 词：氮 Mn18Cr18N护环钢 高温力学性能 MN18CR18N 护环钢 氮含量 热模拟试验机 高温塑性 汽轮发电机 断面收缩率 

分 类 号：TG113.25[金属学及工艺—物理冶金]