邓莉萍,鲁世强,汤斌兵.热暴露对Cr-12Nb-4.4Ni合金组织及性能的影响[J].稀有金属材料与工程,2019,48(12):4068~4073.[Deng Liping,Lu Shiqiang,Tang Binbing.Effect of Thermal Exposure on Microstruture and Properties of Cr-12Nb-4.4Ni Alloy[J].Rare Metal Materials and Engineering,2019,48(12):4068~4073.]
热暴露对Cr-12Nb-4.4Ni合金组织及性能的影响
投稿时间:2018-09-13  修订日期:2018-10-20
中文关键词:  Cr基合金  Laves相  热暴露  Ni  晶体缺陷
基金项目:国家自然科学基金(51074092),江西省自然科学基金(20161BAB206113),江西省教育厅落地计划项目(KJLD14056),江西省教育厅科技计划(GJJ160677)
中文摘要:
      对机械合金化+热压制备的Cr-12Nb-4.4Ni合金在1200℃下分别热暴露30,50,100h,研究了热暴露不同时间后合金的组织和性能的变化。结果表明:合金由Cr固溶体和NbCr2构成,Ni主要存在于NbCr2中,热暴露过程中物相稳定;随着热暴露时间的延长,合金中Cr固溶体颗粒长大而NbCr2颗粒尺寸变化不大,Ni优先取代Cr的位置,松弛了NbCr2结构,Cr/NbCr2两相界面处压应力的增加,促进了Cr固溶体中位错的出现和NbCr2颗粒中层错/孪晶密度的增加。随着热暴露时间的延长,合金的室温压缩强度,屈服强度和塑性应变虽略有降低,但仍能保持较高的强度和良好的塑性,热暴露100h后,其压缩强度,屈服强度和塑性应变仍有2170MPa,1406MPa和9.5%。Cr-12Nb-4.4Ni合金热暴露100h后仍具有良好的断裂韧性。
Effect of Thermal Exposure on Microstruture and Properties of Cr-12Nb-4.4Ni Alloy
英文关键词:Chromium-base alloy  Laves phase  thermal exposure  Ni  crystal defects
英文摘要:
      The Cr-12Nb-4.4 Ni alloy, prepared by mechanical alloying and hot pressing, was thermally exposed at 1200℃ for 30, 50 and 100 h, respectively. Then, the microstructure and properties of the thermally exposed Cr-12Nb-4.4Ni alloy were studied. The results show that the phase constituent is stable during the thermal exposure process. It consists of Cr solid solution (Crss) and NbCr2, and Ni is mainly presented in NbCr2. Grain size of Crss increases with the thermal exposure time, while grain size of NbCr2 particle has no obvious change. The NbCr2 structure becomes loose due to the replacement of Cr by Ni. The increase of compressive stress in the phase interface of Cr/NbCr2 promotes the emergence of dislocations in Cr matrix and the increase of stacking fault/ twinning fault in NbCr2 particles. With the thermal exposure time, the compressive strength, yield strength and plastic strain of the Cr-12Nb-4.4 Ni alloy decrease slightly while the alloy still remains relatively high room temperature strength and good plastic during the thermal exposure process. After thermal exposure for 100h, the compressive strength, yield strength and plastic strain are 2170MPa, 1406MPa and 9.5%, respectively. The Cr-12Nb-4.4 Ni alloy can keep good fracture toughness after thermal exposure for 100h.
作者单位E-mail
邓莉萍 南昌航空大学 denglp790331@aliyun.com 
鲁世强 南昌航空大学  
汤斌兵 南昌大学  
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