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金属学报  2019, Vol. 55 Issue (6): 720-728    DOI: 10.11900/0412.1961.2018.00491
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B含量对K417G合金凝固过程中组织演变和力学性能的影响
刘巧沐1,黄顺洲1,刘芳2,杨艳3,南宏强3,张东3,孙文儒2()
1. 中国航发四川燃气涡轮研究院 成都 610500
2. 中国科学院金属研究所 沈阳 110016
3. 金川集团股份有限公司镍钴资源综合利用国家重点实验室 金昌 737100
Effect of Boron Content on Microstructure Evolution During Solidification and Mechanical Properties of K417G Alloy
Qiaomu LIU1,Shunzhou HUANG1,Fang LIU2,Yan YANG3,Hongqiang NAN3,Dong ZHANG3,Wenru SUN2()
1. AECC Sichuan Gas Turbine Establishment, Chengdu 610500, China
2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3. Laboratory of Nickel and Cobalt Resources Comprehensive Utilization, Jinchuan Group Co. , Ltd. , Jinchang 737100, China
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摘要: 

研究了B含量对K417G合金凝固过程中相析出以及铸态组织和力学性能的影响。研究不仅证实了B显著促进元素偏析以及凝固后期(γ+γ')共晶析出,还发现B对K417G合金凝固早期基体γ相的析出和长大具有明显影响。B降低基体γ相的析出温度,抑制γ相的形核,并阻碍γ相生长。当B含量低于0.036%时,由于B降低γ相形核率,导致K417G合金的晶粒组织随B含量增加明显粗化。当B含量增加至0.060%时,尽管B仍然降低γ相形核率,但由于其阻碍γ相枝晶的早期生长,使熔体内部过冷度升高,局部发生晶粒细化。B对K417G合金力学性能的影响决定于硼化物的晶界析出形态,当B含量低于0.036%时,硼化物以颗粒状在晶界析出并对晶界产生强化作用,合金的900 ℃拉伸性能和900 ℃、315 MPa持久性能随B含量的增加而显著提高。当B含量达到0.060%时,共晶态硼化物在(γ+γ')前沿析出,导致共晶态硼化物与(γ+γ')的界面显著弱化,拉伸和持久性能显著降低。

关键词 K417G合金B凝固过程显微组织力学性能    
Abstract

Boron is a key element in superalloys and many other metallic materials for strengthening the grain boundaries. However, it also has harmful effect on aggravating the solidification segregation of the alloys. Although the mechanism for the influences of B on the alloys has been studied extensively, it is still required to study in some alloys currently because the compositive effects of boron in different alloys are sometimes distinct. K417G, a cast superalloy with good comprehensive properties, has been applied in aero engines of China. In the present work, the effects of boron content on the microstructure evolution during the solidification and the mechanical properties of the as cast K417G alloy have been investigated, providing some fundamental information for the control of boron addition in the alloy. It has been found that boron aggravated the elemental segregation and promoted the eutectic (γ+γ') precipitation at the final stage of the solidification of K417G alloy. In addition, boron decreased the precipitation temperature, and hence reduced the nucleation rate of the γ matrix. When the boron content was below 0.036%, the grain size was increased with the increment of B content, which is caused by the decreased nucleation of the γ phase. When the B addition was increased up to 0.060%, the grain was refined at some local places, because the growth of the dendrites was inhibited and the γ phase could nucleate at the inner part of the subcooled liquids. The mechanical properties of K417G alloy were significantly influenced by the precipitation of the boride at the grain boundaries. The borides were precipitated as fine particles at the grain boundaries when the B addition was below 0.036%, and the tensile properties at 900 ℃ and the stress rupture properties at 900 ℃ and 315 MPa were markedly improved with the increasing B content in this addition range. When the B content was increased to 0.060%, the boride was precipitated as eutectic form in front of the eutectic (γ+γ'). The tensile and stress rupture properties were decreased due to the weak cohesion between the eutectic (γ+γ') and the eutectic form borides.

Key wordsK417G alloy    B    solidification process    microstructure    mechanical property
收稿日期: 2018-11-01      出版日期: 2019-04-29
ZTFLH:  TG27  
通讯作者: 孙文儒     E-mail: wrsun@imr.ac.cn
Corresponding author: Wenru SUN     E-mail: wrsun@imr.ac.cn
作者简介: 刘巧沐,男,1984年生,高级工程师,博士

引用本文:

刘巧沐,黄顺洲,刘芳,杨艳,南宏强,张东,孙文儒. B含量对K417G合金凝固过程中组织演变和力学性能的影响[J]. 金属学报, 2019, 55(6): 720-728.
Qiaomu LIU,Shunzhou HUANG,Fang LIU,Yan YANG,Hongqiang NAN,Dong ZHANG,Wenru SUN. Effect of Boron Content on Microstructure Evolution During Solidification and Mechanical Properties of K417G Alloy. Acta Metall Sin, 2019, 55(6): 720-728.

链接本文:

http://www.ams.org.cn/CN/10.11900/0412.1961.2018.00491      或      http://www.ams.org.cn/CN/Y2019/V55/I6/720

图1  不同B含量K417G合金铸态组织的OM像
图2  不同B含量K417G合金(γ+γ')共晶析出相形貌的OM像
图3  K417G合金中B含量与(γ+γ')共晶析出量之间的关系
图4  B含量对硼化物在K417G合金晶界及(γ+γ')共晶前沿析出的影响
图5  不同B含量K417G合金的DSC曲线
图6  B含量对K417G合金900 ℃拉伸性能的影响
图7  K417G合金900 ℃拉伸试样宏观断口及其纵截面形貌的SEM像
图8  不同B含量K417G合金900 ℃、315 MPa持久性能
图9  K417G合金900 ℃、315 MPa持久试样宏观断口及纵截面形貌的SEM像
图10  K417G合金拉伸断口显微组织及纵截面形貌的SEM像
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