|
|
Effects of Re-Melting Processes on the Tensile Properties of K452 Alloy at High Temperature |
Jinxia YANG1(),Futao XU1,Donglin ZHOU2,Yuan SUN1,Xingyu HOU1,Chuanyong CUI1 |
1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China 2 Harbin Dongan Engine Group Corporation LTD., Harbin 150066, China |
|
Cite this article:
Jinxia YANG,Futao XU,Donglin ZHOU,Yuan SUN,Xingyu HOU,Chuanyong CUI. Effects of Re-Melting Processes on the Tensile Properties of K452 Alloy at High Temperature. Acta Metall Sin, 2017, 53(6): 703-708.
|
Abstract K452 alloy is a nickel-based cast superalloy having the good tensile properties at high temperature and excellent corrosion resistance. It has been applied as a blade material of engines when environmental temperature is not above 950 ℃. It is found that the tensile properties of the alloy have become more scattered and unstable although its chemical compositions are not changed. Hence, the tensile properties of the alloy were studied in order to increase its stability at high temperature and improve its applied properties. Tensile specimens were prepared using the different re-melting processes. Tensile tests were done at 900 ℃. When the pouring temperature was 1430 ℃, tensile properties were not only lower than expected, but also had great degree of dispersion, i.e., the vales of ultimate strengths changed in the range of 410 MPa and 510 MPa, and the elongations changed in the range of 3.5% and 22.0%, the average contents of O and N were the highest among three tested conditions. The highest N content was 0.0028%. And the shrinkage area was higher than those in other two re-melting processes. When the pouring temperature was 1500 ℃, the tensile properties were improved, and their changing scopes became small, the average contents of O and N decreased, the shrinkage area decreased. When the refining temperature was 1590 ℃ and the holding time was 5 min, both average contents of O and N were decreased greatly, the shrinkage was not seen in the fracture surfaces. And the tensile properties were improved. Furthermore, their changing scopes were very small.
|
Received: 05 July 2016
|
Fund: Supported by National Natural Science Foundation of China (No.11332010) |
[1] | Guo J T, Yuan C. China Superalloys Handbook, Book 3: Cast Superalloy et al [M]. Beijing: China Standard Press, 2012: 222 | [1] | (郭建亭, 袁超. 中国高温合金手册, 下卷: 铸造高温合金等 [M]. 北京: 中国标准出版社, 2012: 222) | [2] | Guo J T.Materials Science and Engineering for Superalloys, Book 3: Materals and Engineering Application for Superalloy [M]. Beijing: Science Press, 2010: 328 | [2] | (郭建亭. 高温合金材料学, 下册: 高温合金材料与工程应用 [M]. 北京: 科学出版社, 2010: 328) | [3] | Qin X Z.Microstructure and property stability of cast Ni-base superalloys K452 and K446 during long-term thermal exposure [D]. Shenyang: Institute of Metal Research, Chinese Academy of Sciences, 2008 | [3] | (秦学智. 铸造高温合金K452和K446在长期时效期间的组织和性能的演变 [D]. 沈阳: 中国科学院金属研究所, 2008) | [4] | Pope D P, Ezz S S.Mechanical properties of Ni3Al and nickel-base alloys with high volume fraction of γ'[J]. Int. Met. Rev., 1984, 29: 136 | [5] | Sieb?rger D, Knake H, Glatzel U.Temperature dependence of the elastic moduli of the nickel-base superalloy CMSX-4 and its isolated phases[J]. Mater. Sci. Eng., 2001, A298: 26 | [6] | Copley S M, Kear B H.A dynamic theory of coherent precipitation hardening with application to nickel-base superalloys[J]. Trans. Metall. Soc. AIME, 1967, 239: 984 | [7] | Bettge D, ?sterle W, Ziebs J.Temperature dependence of yield strength and elongation of the nickel-base superalloy IN 738 LC and the corresponding microstructural evolution[J]. Z. Metallkd., 1995, 86: 190 | [8] | Chu Z K.Investigation of mechanical property and deformation mechanism of DZ951 alloy [D]. Shenyang: Institute of Metal Research, Chinese Academy of Sciences, 2008 | [8] | (储昭贶. DZ951合金力学性能及变形机制的研究 [D]. 沈阳: 中国科学院金属研究所, 2008) | [9] | He L Z, Zheng Q, Sun X F, et al.Low ductility at intermediate temperature of Ni-base superalloy M963[J]. Mater. Sci. Eng., 2004, A380: 340 | [10] | Milligan W W, Antolovich S D.Yielding and deformation behavior of the single crystal superalloy PWA 1480[J]. Metall. Trans., 1987, 18A: 85 | [11] | Wang J, Zhou L Z, Sheng L Y, et al.The microstructure evolution and its effect on the mechanical properties of a hot-corrosion resistant Ni-based superalloy during long-term thermal exposure[J]. Mater. Des., 2012, 39: 55 | [12] | Qin X Z, Guo J T, Yuan C, et al.Precipitation and thermal instability of M23C6 carbide in cast Ni-base superalloy K452[J]. Mater. Lett., 2008, 62: 258 | [13] | Qin X Z, Guo J T, Yuan C, et al.Decomposition of primary MC carbide and its effects on the fracture behaviors of a cast Ni-base superalloy[J]. Mater. Sci. Eng., 2008, A485: 74 | [14] | Qin X Z, Guo J T, Yuan C, et al.Thermal stability of primary carbides and carbonitrides in two cast Ni-base superalloys[J]. Mater. Lett., 2008, 62: 2275 | [15] | Yang J X, Zheng Q, Ji M Q, et al.Effects of refining processes on metallurgical defects and room temperature' tensile properties of superalloy IN792[J]. Rare Met. Mater. Eng., 2012, 41: 692 | [15] | (杨金侠, 郑启, 纪曼青等. 精炼工艺对IN792合金冶金缺陷和拉伸性能的影响[J]. 稀有金属材料与工程, 2012, 41: 692 | [16] | Yang J X, Zheng Q, Sang Z R, et al.Effects of melting treatments on the mechanical properties of reverted DZ40M alloy[J]. Acta Metall. Sin., 2010, 46: 1511 | [16] | (杨金侠, 郑启, 桑志茹等. 熔体处理对DZ40M返回合金力学性能的影响[J]. 金属学报, 2010, 46: 1511) | [17] | Niu J P.Investigation on super refining Ni-based superalloy by vaccum induction melting [D]. Shenyang: Institute of Metal Research, Chinese Academy of Sciences, 2002 | [17] | (牛建平. 镍基高温合金超纯净真空感应熔炼工艺的研究 [D]. 沈阳: 中国科学院金属研究所, 2002) | [18] | Niu J P, Yang K N, Jin T, et al.Desulphurization during VIM refining Ni-base superalloy[J]. Acta Metall. Sin., 2001, 37: 499 | [18] | (牛建平, 杨克努, 金涛等. Ni基高温合金的真空冶炼脱硫[J]. 金属学报, 2001, 37: 499) | [19] | Niu J P, Yang K N, Jin T, et al.Denitrogenation during VIM refining Ni-base superalloy[J]. Acta Metall. Sin., 2001, 37: 943 | [19] | (牛建平, 杨克努, 金涛等. 真空感应熔炼超纯净镍基高温合金脱氮的研究[J]. 金属学报, 2001, 37: 943) | [20] | Yuan C, Guo J T, Wang T L, et al.Effect of revert proportion on microstructure and property of a cast cobalt-base superalloy K640S[J]. Acta Metall. Sin., 2000, 36: 961 | [20] | (袁超, 郭建亭, 王铁利等. 返回料添加比例对铸造钴基高温合金K640S组织与性能的影响[J]. 金属学报, 2000, 36: 961) | [21] | Li C.Metallurgy Mechanism [M]. Harbin: Harbin Institute of Technology Press, 1996: 196 | [21] | (李超. 金属学原理 [M]. 哈尔滨: 哈尔滨工业大学出版社,1996: 196) | [22] | Yang J X, Sun Y, Jin T, et al.Microstructure and mechanical properties of a Ni-based superalloy with refined grains[J]. Acta Metall. Sin., 2014, 50: 839 | [22] | (杨金侠, 孙元, 金涛等. 一种细晶铸造镍基高温合金的组织与力学性能[J]. 金属学报, 2014, 50: 839) |
|
No Suggested Reading articles found! |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
|
Shared |
|
|
|
|
|
Discussed |
|
|
|
|