Effect of Long-Term Aging at 620 T on Structure and Mechanical Properties of a New Ferrite Heat Resistant Steel 1Cr11Co3W3MoVNbNB

Special Steel ›› 2010, Vol. 31 ›› Issue (5): 67-70.

Effect of Long-Term Aging at 620 T on Structure and Mechanical Properties of a New Ferrite Heat Resistant Steel 1Cr11Co3W3MoVNbNB

Liu Xinquan^1,2 , Yang Gang² , Wu xinghui¹ , Xiang Jinzhong¹ , Yang Muxin²

1. School of Physical Science and Technology, Yunnan University, Kunming 650091 ；
2. Institute for Structural Materials, Central Iron and Steel Institute, Beijing 100081；

Received:2010-05-19 Online:2010-10-01 Published:2022-11-12
Contact: Yang Gang

620 ℃长期时效对新型铁素体耐热钢1Cr11Co3W3MoVNbNB组织和力学性能的影响

刘新权^1,2，杨钢²，吴兴惠¹，项金钟¹，杨沐鑫²

1. 云南大学物理科学技术学院，昆明 650091 ；
2. 钢铁研究总院结构材料研究所，北京 100081;

通讯作者: 杨钢
作者简介:刘新权(1973-)，男，硕士研究生，铁素体耐热钢研究.
基金资助:
国家高技术研究发展计划(863 )项目 (2009AA03Z509)

Abstract

Abstract: The effect of long-term aging at 620 ℃ on structure and mechanical properties of a new ferrite heat resistant steel 1Cr11Co3W3MoVNbNB (%： 0.10C, 11.08Cr, 3.20Co, 2.54W, 0.52Ni, 0.15Mo, 0.09Nb, 0.21N, 0.014B) oil-quenched at 1100 °C + high temperature tempered at 720 ℃. has been studied by using X-ray diffraction method, optical, scanning electron and transmission electron microscope. Results show that with aging at 620 ℃ for 2000 h, the aging time isn't obvious effect on the mechanical properties of the steel at ambient and at 620 °C ; during aging the main precipitated phases are M₂₃C₆, Nb(CN) and M₃B₂, and the structure of steel is stable and the lath sub-structure has not changed obviously; The elements Mo, W and V in solid solution mainly precipitate into precipitated phase in aging process and the elements Nb and B mainly precipitate in high temperature tempering and in initial period of aging.

Key words: Ferrite-Heat-Resistant Steel, Long-Term-Aging, Structure, Mechanical Mroperty

摘要： 采用X射线衍射、光学显微镜、扫描电镜和透射电镜研究了620℃长期时效对1100℃油淬+720℃高温回火的新型铁素体耐热钢1Cr11Co3W3MoVNbNB(%:0.10C、11.08Cr、3.20Co、2.54W、0.52Ni、0.15Mo、0.09Nb、0.021N、0.014B)的显微组织和力学性能的影响。结果表明,620℃ 2000 h时效下,时效时间对室温及620℃力学性能影响不大,时效过程中主要有M₂₃C₆、Nb(CN)和M₃B₂三类析出相,板条亚结构没有明显的变化,显微组织稳定;固溶的Mo、W、V主要在时效过程中"脱溶"进入析出相,Nb、B主要在高温回火以及时效初期"脱溶"。

关键词: 铁素体耐热钢, 长期时效, 组织, 力学性能

Liu Xinquan , Yang Gang , Wu xinghui , Xiang Jinzhong , Yang Muxin. Effect of Long-Term Aging at 620 T on Structure and Mechanical Properties of a New Ferrite Heat Resistant Steel 1Cr11Co3W3MoVNbNB[J]. Special Steel, 2010, 31(5): 67-70.

刘新权, 杨钢, 吴兴惠, 项金钟, 杨沐鑫. 620 ℃长期时效对新型铁素体耐热钢1Cr11Co3W3MoVNbNB组织和力学性能的影响[J]. 特殊钢, 2010, 31(5): 67-70.

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