固溶处理对GH3625合金板材组织及性能的影响

doi:10.11896/j.issn.1005-023X.2018.02.017

《材料导报》期刊社

2018, Vol. 32

Issue (2): 243-248 https://doi.org/10.11896/j.issn.1005-023X.2018.02.017

物理材料研究｜材料

固溶处理对GH3625合金板材组织及性能的影响

丁雨田,孟斌,高钰璧,高鑫,豆正义,马元俊

兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,兰州 730050

Effect of Solution Treatment on the Microstructure and Mechanical Properties of GH3625 Superalloy Sheet

Yutian DING,Bin MENG,Yubi GAO,Xin GAO,Zhengyi DOU,Yuanjun MA

State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050

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摘要

通过OM、SEM、EDS能谱分析和万能拉伸试验机以及洛氏硬度计等手段研究了固溶处理对GH3625合金板材组织和力学性能的影响。结果表明:固溶处理后合金的晶粒基本上呈等轴状态,且内部存在大量退火孪晶;当固溶温度高于1 130 ℃时,合金中的碳化物几乎完全溶解到基体中;在8901 190 ℃固溶时,晶粒尺寸随温度的升高而增加,且晶粒长大激活能Q_g为227.18 kJ/mol;在不同的固溶温度下,晶粒尺寸与GH3625合金的室温力学性能符合Hall-Petch关系,合金的强化机制主要为细晶强化;随着温度的升高,GH3625合金板材的断裂方式由脆性断裂逐渐演变为明显的韧性断裂。

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	丁雨田
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关键词: GH3625合金板材固溶处理孪晶晶粒尺寸断裂

Abstract:

The influence of solution treatment on microstructure and mechanical properties of GH3625 alloy sheet were investigated by OM, SEM, EDS, universal testing machine and Rockwell hardness tester and other means. The results indicated that the grains were equiaxed and there were a large number of annealing twins after the solution treatment. As solution treatment temperature was more than 1 130 ℃, the carbides in alloy almost completely dissolve into the matrix. Grain size was prompted by temperature increasing in the range of 890 ℃ to 1 190 ℃, and the energy (Q_g) of grain growth was 227.18 kJ/mol. At different solution temperature, the grain size and room-temperature mechanical properties of GH3625 alloy accord with Hall-Petch relation. The main strengthening mechanism was fine grained strengthening. With the increase of temperature, the fracture mode of GH3625 alloy sheet was changed from brittle fracture to ductile fracture.

Key words: GH3625 superalloy sheet solution treatment twins grain size fracture

出版日期: 2018-01-25 发布日期: 2018-01-25

ZTFLH:

TG146.1 ⁺5

基金资助: 国家自然科学基金(51661019);甘肃省重大科技专项项目(145RTSA004)

引用本文:

丁雨田,孟斌,高钰璧,高鑫,豆正义,马元俊. 固溶处理对GH3625合金板材组织及性能的影响[J]. 《材料导报》期刊社, 2018, 32(2): 243-248.
Yutian DING,Bin MENG,Yubi GAO,Xin GAO,Zhengyi DOU,Yuanjun MA. Effect of Solution Treatment on the Microstructure and Mechanical Properties of GH3625 Superalloy Sheet. Materials Reports, 2018, 32(2): 243-248.

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https://www.mater-rep.com/CN/10.11896/j.issn.1005-023X.2018.02.017 或 https://www.mater-rep.com/CN/Y2018/V32/I2/243

表1 实验材料的化学成分(质量分数/%)

图1 GH3625合金原始显微组织

图2 不同温度热处理后GH3625合金的组织

图3 不同固溶温度下GH3625合金板材的析出相分布情况

图4 固溶温度对晶粒尺寸的影响

图5 GH3625合金晶粒尺寸与固溶温度的关系

图6 固溶温度对力学性能的影响

图7 不同固溶处理温度下GH3625合金的Hall-Petch关系

图8 GH3625合金板材的原始断口形貌

图9 不同温度固溶处理后GH3625合金的断口形貌

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