GH4738合金高温扩散退火工艺

doi:10.13251/j.issn.0254-6051.2020.10.010

金属热处理 ›› 2020, Vol. 45 ›› Issue (10): 48-53.DOI: 10.13251/j.issn.0254-6051.2020.10.010

GH4738合金高温扩散退火工艺

苏醒¹, 史松宜¹, 吕旭东^1,2

1.钢铁研究总院高温材料研究所, 北京 100081;
2.北京钢研高纳科技股份有限公司, 北京 100081

收稿日期:2020-07-24 出版日期:2020-10-25 发布日期:2020-12-29
通讯作者: 吕旭东,教授,E-mail: lxdong0700@163.com
作者简介:苏醒(1994—),男,硕士研究生,主要研究方向为变形高温合金,E-mail: su1136625114@163.com。

High-temperature diffusion annealing process of GH4738 alloy

Su Xing¹, Shi Songyi¹, Lü Xudong^1,2

1. High-temperature Materials Institute, Central Iron and Steel Research Institute, Beijing 100081, China;
2. Beijing CISRI-GAONA Materials & Technology Co., Ltd., Beijing 100081, China

Received:2020-07-24 Online:2020-10-25 Published:2020-12-29

摘要/Abstract

摘要： 借助于Thermal-calc热力学软件计算了合金的平衡凝固相图,以此为依据制定了高温扩散退火处理的试验参数。利用OM和SEM观察了GH4738合金的铸态偏析状况,并用EPMA技术研究了合金铸态以及不同高温扩散退火制度下的元素偏析规律。结果表明,铸态合金中Ti元素偏析最为严重,高温扩散退火处理后Ti元素偏析得到明显改善,经1200 ℃×50 h的高温处理后效果最为显著,同时计算了残余偏析指数随温度的变化曲线,计算结果和试验结果基本吻合。

关键词: GH4738合金, 元素偏析, 扩散退火, 电子探针

Abstract: Equilibrium solidification phase diagram of GH 4738 superalloy was calculated by using Thermal-calc software, based on which experimental parameters of homogenization treatment was established.The segregation of as-cast GH4738 superalloy was observed by using OM and SEM ,the laws of element segregation in the as-cast alloy with as-cast and different diffused annealing state at different temperatures were studied by using EPMA technique.The results show that Ti element segregation is the most serious in the as-cast alloy, the segregation of Ti element is significantly improved after the alloy treated by high-temperature diffusion annealing process, and the effect is the most significant after annealing at 1200 ℃ for 50 h. Meanwhile, the change curves of the residual segregation index versus temperature is calculated, and the calculated results are basically in accord with the experimental results.

Key words: GH4738 alloy, element segregation, diffusion annealing, EPMA

中图分类号:

TG132.3

苏醒, 史松宜, 吕旭东. GH4738合金高温扩散退火工艺[J]. 金属热处理, 2020, 45(10): 48-53.

Su Xing, Shi Songyi, Lü Xudong. High-temperature diffusion annealing process of GH4738 alloy[J]. Heat Treatment of Metals, 2020, 45(10): 48-53.

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GH4738合金高温扩散退火工艺

High-temperature diffusion annealing process of GH4738 alloy

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