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金属学报  2017, Vol. 53 Issue (6): 703-708    DOI: 10.11900/0412.1961.2016.00286
  本期目录 | 过刊浏览 |
重熔工艺对K452合金高温拉伸性能的影响
杨金侠1(),徐福涛1,周动林2,孙元1,侯星宇1,崔传勇1
1 中国科学院金属研究所 沈阳 110016
2 哈尔滨东安发动机集团有限公司 哈尔滨 150066
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
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摘要: 

采用不同重熔工艺制备K452合金试样, 测试试样在900 ℃下的拉伸性能。结果表明:当浇注温度为1430 ℃时, 试样的抗拉强度从410 MPa变化到 510 MPa,延伸率从 3.5% 变化到 22.0%,实验数据较分散;试样中O和N平均含量较高,尤其N含量达0.0028%之多;断口上存在大量疏松。当浇注温度提高到1500 ℃时,拉伸性能得到提高,试样中O和N的平均含量有所降低,断口上疏松减少。当合金经过1590 ℃保温5 min的高温净化处理,浇注温度仍为1500 ℃时,试样的拉伸性能大幅度提高,O和N的平均含量明显降低,断口上没有观察到疏松,实验数据具有较好的一致性。

关键词 高温合金拉伸性能疏松    
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.

Key wordssuperalloy    tensile property    shrinkage
收稿日期: 2016-07-05      出版日期: 2017-03-16
基金资助:国家自然科学基金项目No.11332010

引用本文:

杨金侠,徐福涛,周动林,孙元,侯星宇,崔传勇. 重熔工艺对K452合金高温拉伸性能的影响[J]. 金属学报, 2017, 53(6): 703-708.
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, 2017, 53(6): 703-708.

链接本文:

http://www.ams.org.cn/CN/10.11900/0412.1961.2016.00286      或      http://www.ams.org.cn/CN/Y2017/V53/I6/703

Process No. T1 / ℃ τ / min T2 / ℃
1 1500 3 1430
2 1500 3 1500
3 1590 5 1500
表1  重熔工艺参数
图1  重熔工艺No.1浇注的试样No.5的断口形貌
Sample No. wO / % wN / % T / ℃ Rm / MPa A / %
1 - - 901 455 4.0
2 0.0019 0.0028 898 410 Brittle fracture
3 0.0015 0.0018 903 485 4.0
4 - - 900 495 12.0
5 0.0017 0.0015 902 455 3.5
6 - - 899 450 19.0
7 0.0011 0.0013 903 510 20.0
8 0.0010 0.0009 899 495 22.0
9 - - 900 480 8.4
10 - - 898 490 6.5
Average 0.00141 0.00171 900.4 471.5 11.04
Changed scope 0.0010~0.0019 0.0009~0.0028 898~903 410~510 3.5~22.0
表2  重熔工艺No.1浇注的K452合金中O和N含量及拉伸性能
图2  重熔工艺No.1浇注的试样No.7的断口形貌
图3  重熔工艺No.2浇注的No.1试样断口形貌
Sample No. wO / % wN / % T / ℃ Rm / MPa A / %
1 0.0011 0.0009 900 490 10.0
2 0.0007 0.0009 897 470 20.0
3 0.0011 0.0006 903 490 17.6
4 0.0009 0.0009 902 530 16.5
5 0.0012 0.0013 899 505 12.0
6 0.0010 0.0009 903 495 17.6
Average 0.0010 0.00091 900.7 495 15.61
Changed scope 0.0007~0.0012 0.0006~0.0013 897~903 470~530 10.0~20.0
表3  重熔工艺No.2浇注的K452合金中O和N含量及拉伸性能
Sample No. wO / % wN / % T / ℃ Rm / MPa A / %
1 0.0007 0.0006 902 500 23.0
2 0.0005 0.0006 899 530 23.5
3 0.0005 0.0004 903 500 24.0
4 0.0008 0.0006 901 490 23.0
5 0.0009 0.0004 902 490 18.0
6 0.0005 0.0006 900 500 19.5
Average 0.00065 0.0005 901.3 501.6 21.67
Changed scope 0.0005~0.0009 0.0004~0.0006 899~903 490~530 18~24
表4  重熔工艺No.3浇注的K452合金中O和N含量及拉伸性能
图4  重熔工艺No.3浇注的试样No.4的断口形貌
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