NF709R耐热钢高温长时时效后的组织和性能
Microstructure and Mechanical Properties of NF709R Refractory Steel after Prolonged Aging at High Temperature
摘 要
采用显微组织分析和力学性能测试等方法研究了NF709R钢在700 ℃长时(10 000 h)时效后的显微组织和力学性能的变化。结果表明: 在700 ℃时效过程中, 钢中析出相主要有M23C6、MX和Z相; 在4~3 400 h过程中, 晶内细小的MX相、Z相和晶界处M23C6相的共同作用使钢的高温屈服强度逐渐升高; 3 400~6 000 h过程中生成的M23C6碳化物疏松, 晶界强度降低, 使钢的高温屈服强度降低; 6 000~10 000 h过程中, 各种析出相变化不大, 高温屈服强度缓慢下降; 时效态室温塑性和韧性下降是由于M23C6相在晶界上长大、聚集成链状, 使晶界变宽所致。
高温时效
力学性能
析出相
NF709R refractory steel
high temperature aging
mechanical properties
precipitation phase
Abstract
Microstructure and mechanical properties changes of NF709R steel after long time aging at 700 ℃ were studied by microstructure analysis and mechanical properties test. The results show that the main precipitation phases in NF709R steel were M23C6, MX and Z at 700 ℃ aging. During 4-3 400 h, the high temperature yield strength of the steel raised gradually because of the fine MX phase in grains, Z phase and M23C6 in grain boundaries; and during 3 400-6 000 h aging, the high temperature yield strength decreased because of the loosening M23C6 which weaken grain boundaries strength; and during 6 000-10 000 h aging, the high temperature yield strength of the steel decreased slowly and all precipitation changed little. The M23C6 phases which grew up on the grain boundaries, gathered into chain and widened the grain boundaries resulted in the room ductility and toughness of NF709R steel as aging decreased.
中图分类号 TG142.1
所属栏目
基金项目
收稿日期 2010/4/26
修改稿日期 2010/10/20
网络出版日期
作者单位点击查看
备注王斌(1984-), 男, 山东寿光人, 硕士研究生。
引用该论文: WANG Bin,CHENG Shi-chang,ZHOU Yun,WANG Jing-zhong,BAO Han-sheng,LIU Zheng-dong. Microstructure and Mechanical Properties of NF709R Refractory Steel after Prolonged Aging at High Temperature[J]. Materials for mechancial engineering, 2011, 35(5): 72～76
王斌,程世长,周芸,王敬忠,包汉生,刘正东. NF709R耐热钢高温长时时效后的组织和性能[J]. 机械工程材料, 2011, 35(5): 72～76
共有人对该论文发表了看法，其中：
人认为该论文很差
人认为该论文较差
人认为该论文一般
人认为该论文较好
人认为该论文很好
参考文献
【1】刘正东, 程世长, 包汉生, 等.超超临界火电机组用锅炉钢技术国产化问题[J].钢铁, 2009, 44(6):1-7.
【2】刘正东, 程世长, 干勇, 等.中国600 ℃蒸汽参数火电机组用锅炉钢管国产化研制进展[J].钢铁, 2010, 45(10):1-8.
【3】陆燕荪.从超临界机组的发展透视研发新材料的紧迫性[J].发电设备, 2006(3):149-151.
【4】赵中平, 姚珉芳.超级超临界机组开发讨论[J].动力工程, 2000, 20(2):640-644.
【5】MARUYAMA K, SAWADA K, KOIKE J. Strengthening mechanisms of creep resistant tempered martensitic steel[J].ISIJ International, 2001, 41(6):641-653.
【6】缪筱玲.超超临界锅炉用奥氏体不锈钢管NF709[J].东方锅炉, 2005(4):7-11.
【7】TSKAHASHI T, KIKUCHI M. Development of high-strength 20Cr-25Ni(NF709) steel for USC boiler tubes[J].Nippon Steel Technical Report, 1988, 38:26-33.
【8】SOURMAIL T, BHADESHIA H K D H. Microstructural evolution in two variants of NF709 at 1 023 and 1 073 K[J].Metallurgical and Materials Transactions A, 2005, 36:23-34.
【2】刘正东, 程世长, 干勇, 等.中国600 ℃蒸汽参数火电机组用锅炉钢管国产化研制进展[J].钢铁, 2010, 45(10):1-8.
【3】陆燕荪.从超临界机组的发展透视研发新材料的紧迫性[J].发电设备, 2006(3):149-151.
【4】赵中平, 姚珉芳.超级超临界机组开发讨论[J].动力工程, 2000, 20(2):640-644.
【5】MARUYAMA K, SAWADA K, KOIKE J. Strengthening mechanisms of creep resistant tempered martensitic steel[J].ISIJ International, 2001, 41(6):641-653.
【6】缪筱玲.超超临界锅炉用奥氏体不锈钢管NF709[J].东方锅炉, 2005(4):7-11.
【7】TSKAHASHI T, KIKUCHI M. Development of high-strength 20Cr-25Ni(NF709) steel for USC boiler tubes[J].Nippon Steel Technical Report, 1988, 38:26-33.
【8】SOURMAIL T, BHADESHIA H K D H. Microstructural evolution in two variants of NF709 at 1 023 and 1 073 K[J].Metallurgical and Materials Transactions A, 2005, 36:23-34.
相关信息
