K480铸造镍基高温合金900 ℃高温时效过程中晶界粗化行为研究

曾强; 燕平; 邵冲; 赵京晨; 韩凤奎; 张龙飞

doi:10.3724/SP.J.1037.2012.00428

金属学报 >

2013 , Vol. 49 >Issue 1: 63 - 70

DOI: https://doi.org/10.3724/SP.J.1037.2012.00428

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K480铸造镍基高温合金900 ℃高温时效过程中晶界粗化行为研究

曾强 ,
燕平 ,
邵冲 ,
赵京晨 ,
韩凤奎 ,
张龙飞

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1. 钢铁研究总院高温材料研究所, 北京 100086
2. 钢铁研究总院高温合金新材料北京重点实验室, 北京 100086

曾强, 男, 1974年生, 高级工程师, 博士

收稿日期: 2012-07-17

修回日期: 2012-09-27

网络出版日期: 2013-01-11

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INVESTIGATION ON COARSENING BEHAVIORS OF SERRATED GRAIN BOUNDARIES IN K480 NICKEL BASE SUPERALLOY DURING LONG TERM AGING AT 900 ℃

ZENG Qiang ,
YAN Ping ,
SHAO Chong ,
ZHAO Jingchen ,
HAN Fengkui ,
ZHANG Longfei

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1. High Temperature Materials Research Department, Central Iron and Steel Research Institute, Beijing 100086
2. Beijing Key Laboratory of Advanced High Temperature Materials, Central Iron and Steel Research Institute, Beijing,100086

Received date: 2012-07-17

Revised date: 2012-09-27

Online published: 2013-01-11

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摘要

铸造K480镍基高温合金经固溶、时效处理后, 在900 ℃长期时效3000 h. 分别用OM和SEM对合金的晶界组织进行了观察, 用EDS对合金中相的成分进行了测量. 结果显示, K480合金的晶界为曲折的锯齿形晶界, 该晶界由含碳化物晶界及含γ’晶界两部分构成. 随着时效时间的延长, 两部分晶界均发生粗化. 其中含碳化物晶界中的MC碳化物分解形成M₆C相和η相,并随时间长大; 而含γ’晶界中不连续γ’相逐渐相连并形成γ’相条带. 含碳化物晶界的粗化比要高于含γ’晶界, 且随时效时间延长, 二者的差异变大. 用Johnson-Mehl-Avrami-Kolmogorov (JMAK)方程量化了时效过程中碳化物晶界和γ’晶界随时效时间的粗化行为, 实验数据与计算结果吻合, 表明二者的粗化行为随时间的演变规律是遵循着JMAK方程的变化形式.

关键词： 镍基高温合金; 锯齿形晶界; 粗化行为; 长期时效; JMAK方程

本文引用格式

曾强 , 燕平 , 邵冲 , 赵京晨 , 韩凤奎 , 张龙飞 . K480铸造镍基高温合金900 ℃高温时效过程中晶界粗化行为研究[J]. 金属学报, 2013 , 49(1) : 63 -70 . DOI: 10.3724/SP.J.1037.2012.00428

Abstract

Serrated grain boundaries in conventional cast nickel base superalloys can enhance high temperature mechanical properties of the alloy due to a large number of precipitates arranged in grain boundaries, which effectively inhibited the movement of dislocations. During service at elevated temperatures, the ripening, coalescence or degeneration process may occur in these precipitates, resulting in the coarsening of grain boundaries with time. This paper aims to investigate the coarsening kinetics and microstructure evolution of serrated grain boundaries in a conventional nickel base superalloy during long term aging. After solution and aging heat treatment, a long term aging treatment at 900 ℃ for 3000 h was carried out on a cast K480 nickel base superalloy. The microstructure of grain boundaries (GBs) was observed using OM and SEM respectively, and phase composition was measured using EDS. The results showed that the GBs of K480 alloy were the irregular serrated GBs composed of carbide GBs andγ’ GBs respectively, both of which coarsened with aging time. During the course of aging, the MC carbides in the carbide GB were decomposed with the formation of new phases of M₆C carbide andη phase; the discontinuous large-sizedγ’ particles in the γ’ GB were coalesced with each other along the GB direction with aging time andγ’ bands formed after aging treatment.The coarsening ratio of the carbide GB was higher than that ofγ’ GB at the beginning of aging treatment and the difference in these two values became larger with increase in aging time. A Johnson-Mehl-Avrami-Kolmogorov (JMAK) type of function was employed to quantify the evolution of coarsening behaviors of the two kinds of GBs with aging time. The good agreement between calculated results and experimental data indicated that the coarsening behaviors of carbide GB andγ’ GB in the serrated GB were evolved as a JMAK type of function of aging time in K480 nickel base superalloy long term aged at 900 ℃.

Key words：

nickel base superalloy

; serrated grain boundary; coarsening behavior; long term aging, JMAK type of function

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