Effects of Aging Treatment on Microstructure and Impact Toughness of HR3C Alloy

Zhao Xinbao; Hou Benrui; Yang Zheng; Dang Yingying; Yuan Yong; Zhang Jinhui

doi:10.15980/j.tzzz.2017.07.005

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Effects of Aging Treatment on Microstructure and Impact Toughness of HR3C Alloy
Vol. 37, Issue 7, Pages: 711-715(2017)
Published： 2017 ，
DOI： 10.15980/j.tzzz.2017.07.005

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[1]赵新宝,侯本睿,杨征,党莹樱,袁勇,张晋辉.时效处理对HR3C合金微观组织和冲击韧度的影响[J].特种铸造及有色合金,2017,37(07):711-715.

Zhao Xinbao, Hou Benrui, Yang Zheng, et al. Effects of Aging Treatment on Microstructure and Impact Toughness of HR3C Alloy. [J]. Special Casting & Nonferrous Alloys 37(7):711-715(2017)
[1]赵新宝,侯本睿,杨征,党莹樱,袁勇,张晋辉.时效处理对HR3C合金微观组织和冲击韧度的影响[J].特种铸造及有色合金,2017,37(07):711-715. DOI： 10.15980/j.tzzz.2017.07.005.

Zhao Xinbao, Hou Benrui, Yang Zheng, et al. Effects of Aging Treatment on Microstructure and Impact Toughness of HR3C Alloy. [J]. Special Casting & Nonferrous Alloys 37(7):711-715(2017) DOI： 10.15980/j.tzzz.2017.07.005.

摘要

采用高温热处理炉对超超临界电站锅炉用HR3C合金进行短时时效和650℃×500h时效

研究了时效对合金微观组织和冲击韧度的影响。结果表明

短时时效后

晶内存在少量一次大块NbCrN相

同时有少量细小的Z相析出。在650℃×500h时效后

晶内析出更多细小的Z相

经短时时效

合金晶内的Z相更多

其弥散强化提高了合金的显微硬度;晶界析出M23C6相并进一步粗化长大

晶界附近有弥散块状的M

相析出。长期时效后

固溶态和短时时效态合金的冲击韧度降低

断口沿晶断裂。

Abstract

HR3Calloy was treated with aging treatment and long-term aging at 650 ℃for 500 hto analyze influence of aging treatment on the microstructure and impact toughness.The results reveal that a few large bulky NbCrN phase an be observed with precipitation of a little tiny Z-phase particles at innergrain after aging treatment.More Z-phase is precipiated in alloy with aging treatment after long-term aging at 650 ℃ for 500 h

which improves the microhardness by dispersedly strengthening effects.Meanwhile

type carbides are coarsened along the grain boundaries

while some M

particles are distributed randomly inside the austenitic grain.The impact toughness values of HR3 Calloy with solid solution treatment or aging treatment are decreased after long-term aging

and the fracture morphologies of the notched impact specimens are characterized by intergranular fracture mode.