Please wait a minute...
金属学报  2019, Vol. 55 Issue (6): 720-728    DOI: 10.11900/0412.1961.2018.00491
  本期目录 | 过刊浏览 |
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
全文: PDF(54241 KB)   HTML
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     
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:

https://www.ams.org.cn/CN/10.11900/0412.1961.2018.00491      或      https://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
[1] Garosshen T J, Tillman T D, McCarthy G P. Effects of B, C, and Zr on the structure and properties of a P/M nickel base superalloy [J]. Metall. Mater. Trans., 1987, 18A: 69
[2] Yan B C, Zhang J, Lou L H. Effect of boron additions on the microstructure and transverse properties of a directionally solidified superalloy [J]. Mater. Sci. Eng., 2008, A474: 39
[3] Shulga A V. Boron and carbon behavior in the cast Ni-base superalloy EP962 [J]. J. Alloys Compd., 2007, 436: 155
[4] Zhao G D, Yu L X, Yang G L, et al. The role of boron in modifying the solidification and microstructure of nickel-base alloy U720Li [J]. J. Alloys Compd., 2016, 686: 194
[5] Hu Q, Liu L, Zhao X B, et al. Effect of carbon and boron additions on segregation behavior of directionally solidified nickel-base superalloys with rhenium [J]. Trans. Nonferrous Met. Soc. China, 2013, 23: 3257
[6] Whitesell H S, Overfelt R A. Influence of solidification variables on the microstructure, macrosegregation, and porosity of directionally solidified Mar-M247 [J]. Mater. Sci. Eng., 2001, A318: 264
[7] Hong H U, Kim I S, Choi B G, et al. On the mechanism of serrated grain boundary formation in Ni-based superalloys with low γ′ volume fraction [A]. Superalloys 2012 [C]. Hoboken, NJ: John Wiley & Sons, Inc., 2012: 53
[8] Alam T, Felfer P J, Chaturvedi M, et al. Segregation of B, P, and C in the Ni-based superalloy, Inconel 718 [J]. Metall. Mater. Trans., 2012, 43A: 2183
[9] Zhang H R, Ojo O A. TEM analysis of Cr-Mo-W-B phase in a DS nickel based superalloy [J]. J. Mater. Sci., 2008, 43: 6024
[10] Zhang H R, Ojo O A, Chaturvedi M C. Nanosize boride particles in heat-treated nickel base superalloys [J]. Scr. Mater., 2008, 58: 167
[11] Blavette D, Duval P, Letellier L, et al. Atomic-scale APFIM and TEM investigation of grain boundary microchemistry in Astroloy nickel base superalloys [J]. Acta Mater., 1996, 44: 4995
[12] Yang F, Hou J S, Gao S, et al. The effects of boron addition on the microstructure stability and mechanical properties of a Ni-Cr based superalloy [J]. Mater. Sci. Eng., 2018, A715: 126
[13] Hosseini S A, Abbasi S M, Madar K Z, et al. The effect of boron and zirconium on wrought structure and γ-γ' lattice misfit characterization in nickel-based superalloy ATI 718Plus [J]. Mater. Chem. Phys., 2018, 211: 302
[14] Kontis P, Alabort E, Barba D, et al. On the role of boron on improving ductility in a new polycrystalline superalloy [J]. Acta Mater., 2017, 124: 489
[15] Wang C S, Guo Y A, Guo J T, et al. Microstructural stability and mechanical properties of a boron modified Ni-Fe based superalloy for steam boiler applications [J]. Mater. Sci. Eng., 2015, A639: 380
[16] Du B N, Sheng L Y, Lai C, et al. Evolution and structure characterization of the carbide and boride during creep in a Ni-based superalloy [J]. Rare Met. Mater. Eng., 2017, 46: 2123
[16] (都贝宁, 盛立远, 赖 琛等. 一种镍基高温合金蠕变过程中碳、硼化物的演变行为及结构表征 [J]. 稀有金属材料与工程, 2017, 46: 2123)
[17] Yu Z H, Zhang Y, Zhai Y N, et al. The research progress of the role of C, B and Hf in nickel-based superalloy [J]. Foundry, 2017, 66: 1076
[17] (余竹焕, 张 洋, 翟娅楠等. C、B、Hf在镍基高温合金中作用的研究进展 [J]. 铸造, 2017, 66: 1076)
[18] Zhang H W, Qin X Z, Li X W, et al. Incipient melting behavior and its influences on the mechanical properties of a directionally solidified Ni-based superalloy with high boron content [J]. Acta Metall. Sin., 2017, 53: 684
[18] (张洪伟, 秦学智, 李小武等. 一种高硼定向凝固合金的初熔行为及其对力学性能的影响 [J]. 金属学报, 2017, 53: 684)
[19] Du B N, Shi Z W, Yang J X, et al. M5B3 boride at the grain boundary of a nickel-based superalloy [J]. J. Mater. Sci. Technol., 2016, 32: 265
[20] Wu B P, Li L H, Wu J T, et al. Effect of boron addition on the microstructure and stress-rupture properties of directionally solidified superalloys [J]. Int. J. Miner. Metall. Mater., 2014, 21: 1120
[21] Hu Z Q, Sun W R, Song H W. A new method for strengthening wrought superalloys-micro-alloying with phosphorus and boron [J]. Eng. Sci., 2005, 3(4): 1
[22] Zhu Y X, Zhang S N, Zhang T X, et al. A new way to improve the superalloys [A]. Superalloys 1992 [C]. Warrendale, PA: TMS, 1992: 145)
[23] High Temperature Material Branch of the Chinese Society for Metals. China Superalloys Handbook (Volume Two) [M]. Beijing: Standards Press of China, 2012: 93
[23] (中国金属学会高温材料分会. 中国高温合金手册, 下卷 [M]. 北京: 中国标准出版社, 2012: 93)
[1] 黄远, 杜金龙, 王祖敏. 二元互不固溶金属合金化的研究进展[J]. 金属学报, 2020, 56(6): 801-820.
[2] 耿遥祥, 樊世敏, 简江林, 徐澍, 张志杰, 鞠洪博, 喻利花, 许俊华. 选区激光熔化专用AlSiMg合金成分设计及力学性能[J]. 金属学报, 2020, 56(6): 821-830.
[3] 赵燕春, 毛雪晶, 李文生, 孙浩, 李春玲, 赵鹏彪, 寇生中. Fe-15Mn-5Si-14Cr-0.2C非晶钢微观组织与腐蚀行为[J]. 金属学报, 2020, 56(5): 715-722.
[4] 姚小飞, 魏敬鹏, 吕煜坤, 李田野. (CoCrFeMnNi)97.02Mo2.98高熵合金σ相析出演变及力学性能[J]. 金属学报, 2020, 56(5): 769-775.
[5] 梁孟超, 陈良, 赵国群. 人工时效对2A12铝板力学性能和强化相的影响[J]. 金属学报, 2020, 56(5): 736-744.
[6] 李源才, 江五贵, 周宇. 温度对碳纳米管增强纳米蜂窝镍力学性能的影响[J]. 金属学报, 2020, 56(5): 785-794.
[7] 杨柯,史显波,严伟,曾云鹏,单以银,任毅. 新型含Cu管线钢——提高管线耐微生物腐蚀性能的新途径[J]. 金属学报, 2020, 56(4): 385-399.
[8] 蒋一,程满浪,姜海洪,周庆龙,姜美雪,江来珠,蒋益明. 高强度含NNi奥氏体不锈钢08Cr19Mn6Ni3Cu2N (QN1803)的显微组织及性能[J]. 金属学报, 2020, 56(4): 642-652.
[9] 李秀程,孙明煜,赵靖霄,王学林,尚成嘉. 铁素体-贝氏体/马氏体双相钢中界面的定量化晶体学表征[J]. 金属学报, 2020, 56(4): 653-660.
[10] 钱月,孙蓉蓉,张文怀,姚美意,张金龙,周邦新,仇云龙,杨健,成国光,董建新. NbFe22Cr5Al3Mo合金显微组织和耐腐蚀性能的影响[J]. 金属学报, 2020, 56(3): 321-332.
[11] 王桂芹,王琴,车宏龙,李亚军,雷明凯. Si对铸造超高铬高碳双相钢组织及性能的影响[J]. 金属学报, 2020, 56(3): 278-290.
[12] 曹育菡,王理林,吴庆峰,何峰,张忠明,王志军. CoCrFeNiMo0.2高熵合金的不完全再结晶组织与力学性能[J]. 金属学报, 2020, 56(3): 333-339.
[13] 于雷,罗海文. 部分再结晶退火对无取向硅钢的磁性能与力学性能的影响[J]. 金属学报, 2020, 56(3): 291-300.
[14] 周霞,刘霄霞. 石墨烯纳米片增强镁基复合材料力学性能及增强机制[J]. 金属学报, 2020, 56(2): 240-248.
[15] 肖宏,许朋朋,祁梓宸,吴宗河,赵云鹏. 感应加热异温轧制制备钢/铝复合板[J]. 金属学报, 2020, 56(2): 231-239.