600℃长期时效对ZG1Cr10MoWVNbN耐热钢组织的影响  

Effect of long-term aging at 600℃ on the microstructure of ZG1Cr10Mo WVNb N martensitic heat-resistant steel

作　　者：赵成志[1] 赵义瀚[2] 金天文 张贺新[1] 

机构地区：[1]哈尔滨工程大学材料科学与化学工程学院,黑龙江哈尔滨150001 [2]哈尔滨汽轮机厂有限责任公司设计研究院,黑龙江哈尔滨150046

出　　处：《哈尔滨工程大学学报》2015年第10期1413-1416,1420,共5页Journal of Harbin Engineering University

基　　金：黑龙江省自然科学基金重点资助项目(ZJG0605-02);哈尔滨市科技成果转换资助项目(2013DB4AG009)

摘　　要：由于ZG1Cr10Mo WVNb N耐热钢在长期高温环境下工作,其长期高温时效性能将变得非常重要。采用600℃下保温17 000 h的长期时效热处理工艺,并对时效前后碳化物显微组织性能变化及析出物对力学性能的影响进行了研究。结果表明,600℃长期时效后,马氏体板条变宽、板条间的界面变得模糊;时效前后,ZG1Cr10Mo WVNb N钢的力学性能有不同程度的下降,其中塑性指标和冲击功下降较大;时效后,在马氏体板条内析出的Nb C碳化物颗粒尺寸仍保持细小,是主要的高温强化相,使钢保持良好的高温性能,可减少合金高温性能的衰退,析出相M23C6碳化物,明显长大,导致马氏体组织出现劣化,强度降低。Because ZG1Cr10 Mo WVNb N heat-resistant steel works under high temperature for a long term,its longterm high temperature aging performance is very important. After a test on a sample of long-term aging heat treatment process under 600℃ for 17 000 hours,the carbide microstructure＇s change in performance before and after the aging test were compared,along with the influence of precipitates on mechanical properties. The results show that after the 600℃ long-term aging process,the martensite lath becomes wider,the interface between laths becomes blurred; before and after the aging,the ZG1Cr10 Mo WVNb N steel＇s mechanical properties decrease to a varying extent,among which the plastic index and the impact power is reduced more obviously; after the aging,the sizes of Nb C carbide granules precipitated are still small,manifesting the main phase after reinforcement under high temperature,it is beneficial to keeping steel＇ s better performance under high temperature,reducing the performance decaying of alloy under high temperature,the precipitated M23C6 carbide becomes coarsened obviously,which leads to worsening of martensite and reducing in strength.

关 键 词：ZG1Cr10MoWVNbN 耐热钢 力学性能 时效 显微结构 

分 类 号：TG142.73[一般工业技术—材料科学与工程]