均匀化态GH3625合金熔化和凝固过程中的相变

doi:10.11901/1005.3093.2016.624

材料研究学报

2017, Vol. 31

Issue (11): 853-859 DOI: 10.11901/1005.3093.2016.624

研究论文

本期目录 | 过刊浏览

均匀化态GH3625合金熔化和凝固过程中的相变

丁雨田, 豆正义(

), 高钰璧, 高鑫, 李海峰, 刘德学

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

Phase Transformation during Metling and Solidifying Process of Homogenized Superalloy GH3625

Yutian DING, Zhengyi DOU(

), Yubi GAO, Xin GAO, Haifeng LI, Dexue LIU

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

引用本文:

丁雨田, 豆正义, 高钰璧, 高鑫, 李海峰, 刘德学. 均匀化态GH3625合金熔化和凝固过程中的相变[J]. 材料研究学报, 2017, 31(11): 853-859.
Yutian DING, Zhengyi DOU, Yubi GAO, Xin GAO, Haifeng LI, Dexue LIU. Phase Transformation during Metling and Solidifying Process of Homogenized Superalloy GH3625[J]. Chinese Journal of Materials Research, 2017, 31(11): 853-859.

全文: PDF(3649 KB) HTML

摘要:

使用差示扫描量热仪(DSC)、共聚焦激光扫描显微镜(CLSM)、扫描电镜(SEM)、和能谱分析仪(EDS)等手段研究了均匀化态GH3625合金在熔化和凝固过程中的组织演变以及主要相的溶解和析出。结果表明：定制的二段式均匀化工艺基本上消除了GH3625合金中的低熔点laves相和微观元素偏析;均匀化态GH3625合金的初熔温度明显提高,熔化先发生在晶界、表面、缩孔及碳化物(NbC)区域;GH3625合金的凝固过程分为三个阶段,主要发生了L→γ、L→γ+MC和L→γ+laves的结晶反应;γ相的形核属于非均匀形核,使溶质原子易偏聚于晶界,从而在枝晶间不可避免的形成了元素偏析和相偏析,其中低熔点laves相的析出类型主要与冷却速率有关。

关键词 ：金属材料, GH3625合金, 共聚焦激光扫描显微镜, 均匀化态, 熔化, 凝固

Abstract：

The microstructure evolution, and the dissolution and precipitation of the main phase of the homogenized superalloy GH3625 during melting and solidifying process were investigated by means of differential scanning calorimetry (DSC), confocal laser scanning microscopy (CLSM), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The results show that the twostep homogenization process is effective for eliminating the laves phase of low-melting point and the segregation in micro-scale for alloying elements of the superalloy GH3625; The initial melting temperature of the homogenized superalloy GH3625 is obviously improved, and the melting occurs firstly in the regions such as grain boundary, surface, shrinkage cavity and carbide (NbC) etc.. The solidification process of the alloy GH3625 can be divided into three stages, and which correspond to mainly the crystallization reactions such as L→γ, L→γ+MC and L→γ+laves. The nucleation of γ phase belong to heterogeneous nucleation, so that solute atoms easily segregate at grain boundaries, which in the dendrites inevitably formed elemental segregation and phase segregation. The precipitation type of the low melting point laves phase is mainly related to the cooling rates.

Key words： metallic materials superalloy GH3625 confocal laser scanning microscopy homogenized melting solidification

收稿日期: 2016-10-25

基金资助:资助项目国家自然科学基金(51661019)和甘肃省重大专项(145RTSA004)

作者简介:

丁雨田,男,1962年生,教授

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https://www.cjmr.org/CN/10.11901/1005.3093.2016.624 或 https://www.cjmr.org/CN/Y2017/V31/I11/853

表1 GH3625合金铸锭的化学成分(质量分数,%)

图1 GH3625合金均匀化前后的组织

表2 GH3625合金铸锭主要元素在不同位置的含量(%)及偏析系数(K)

图2 GH3625合金的DSC曲线

表3 凝固过程中各相反应温度(10 K/min)

图3 GH3625合金熔化和凝固过程中的组织变化

图4 GH3625合金凝固过程中的液相分数与温度和时间的关系

图5 GH3625合金的凝固组织

表4 两种情况下GH3625合金凝固后的参数对比

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