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材料研究学报  2016, Vol. 30 Issue (2): 141-148    DOI: 10.11901/1005.3093.2015.204
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脱芯工艺对钴基高温合金DZ40M组织和性能的影响
佟健1, 陈甲祺2, 郑志1, 于永泗3, 宁礼奎1, 刘恩泽1()
1. 中国科学院金属研究所 沈阳 110016
2. 中国人民解放军驻430厂军代表室 西安 710021
3. 大连理工大学材料科学与工程学院 大连 116024
Effect of Leaching Process for Ceramic Core on Micro-structure and Mechanical Property of Investment Cast Co-base Superalloy DZ40M
TONG Jian1, CHEN Jiaqi2, ZHENG Zhi1, YU Yongsi3, NING Likui1, LIU Enze1,*()
1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. Representative Office of PLA in 430, Xi'an 710021, China
3. School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
引用本文:

佟健, 陈甲祺, 郑志, 于永泗, 宁礼奎, 刘恩泽. 脱芯工艺对钴基高温合金DZ40M组织和性能的影响[J]. 材料研究学报, 2016, 30(2): 141-148.
Jian TONG, Jiaqi CHEN, Zhi ZHENG, Yongsi YU, Likui NING, Enze LIU. Effect of Leaching Process for Ceramic Core on Micro-structure and Mechanical Property of Investment Cast Co-base Superalloy DZ40M[J]. Chinese Journal of Materials Research, 2016, 30(2): 141-148.

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摘要: 

研究了硅基和铝基陶瓷型芯脱除工艺对DZ40M钴基高温合金的组织和性能的影响.结果表明, 硅基陶瓷型芯脱芯处理24 h后, DZ40M合金的组织和性能没有显著变化; 经铝基陶瓷型芯脱芯处理300 h后, DZ40M合金的组织变化不明显, 但是力学性能显著下降.在合金试样外层厚度约1 mm的环形区发生脆化, 是其在脱芯处理过程中被充氢而发生氢脆引起的.

关键词 金属材料DZ40M合金脱芯工艺显微组织力学性能氢脆    
Abstract

Effect of the leaching process of SiO2- and Al2O3-based ceramic core on the microstructure and mechanical property of the investment cast Co-based superalloy DZ40M is investigated. It is shown that after immersion in the leaching medium for SiO2-based ceramic core for 24 h, the microstructure and mechanical property of the alloy does not vary evidently; although after immersion in the leaching medium for Al2O3-based ceramic core for above 300 h, the microstructure variation of DZ40M alloy is not evident, but its mechanical property decreased remarkably, which may be due to the occurrence of an embrittled layer of about 1 mm in thickness on the alloy surface. The embrittled layer is caused by hydrogen embrittlement resulted from charging hydrogen during immersion in the leaching medium for Al2O3-based ceramic core.

Key wordsmetallic materials    DZ40M alloy    core leaching technology    microstructure    mechanical properties    hydrogen embrittlement
收稿日期: 2015-04-13     
ZTFLH:  TG142  
图1  DZ40M合金的铸态组织
图2  硅基脱芯工艺处理24 h后DZ40M合金组织
图3  硅基脱芯处理24 h后DZ40M合金表面的微观组织
图4  硅基脱芯处理24 h后DZ40M合金表面的XRD谱
Leaching time
/h
Tensile strength/MPa Yield strength/MPa Reduction
of area/%
Elongation
/%
0 603 465 7 7
300 630 450 11.5 11.5
600 595 460 5 6.5
表1  硅基脱芯工艺处理不同时间后样品的室温拉伸性能
图5  硅基脱芯处理前后DZ40M合金试样的室温拉伸断口
Leaching
time/h
Rupture
life/h
Reduction of
area/%
Elongation
/%
0 64.55 83.35 46.20
12 85.4 90.28 60.40
24 89.87 87.38 62.73
表2  DZ40M合金经硅基脱芯工艺处理不同时间后在980℃, 83 MPa条件下的持久性能
图6  硅基脱芯处理24 h后DZ40M室温断口的高倍微观组织
图7  在980℃/83 MPa条件下持久样品的断口形貌
图8  铝基脱芯工艺处理后DZ40M合金的微观组织
图9  铝基脱芯处理600 h后试样表面附近的组织
图10  铝基脱芯处理试样表面的XRD谱
Element O Al Ti Cr Fe Co Ni W
Black corroded product 56.79 1.25 4.29 26.02 2.41 4.24 4.62 --
Dark grey corroded product 61.01 3.87 0.38 27.66 1.75 3.70 1.33 0.28
表3  经600 h铝基脱芯处理试样表面腐蚀产物的EDS分析结果
图11  铝基脱芯处理后的DZ40M合金室温断口形貌
图12  铝基脱芯处理600 h后室温拉伸试样断口附近的纵剖面组织
Leaching time/h Rupture life/h Reduction of area/% Elongation/%
0 64.55 46.2 83.35
300 1.12 12.94 16.67
600 0.92 9.83 12.33
表4  DZ40M合金经铝基脱芯工艺处理不同时间后在980℃/83 MPa条件下的持久性能
图13  铝基脱芯不同时间处理后持久试样的断口形貌
Leaching process As-cast Si-based core leaching
medium for 24 h
Al-based core leaching
medium for 300 h
Hydrogen content /×10-6 0.6 1.4 168
表5  脱芯处理前后DZ40M合金试样中的平均氢含量
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