热暴露时间对Cr-9Nb合金组织与性能的影响

林彦; 鲁世强; 邓莉萍; 虞文; 肖璇; 姚敬

doi:10.15980/j.tzzz.2013.05.023

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热暴露时间对Cr-9Nb合金组织与性能的影响
Effect of Thermal Exposure Time on Microstructures and Properties of Cr-9Nb Alloy
2013年33卷第5期页码：458-461
纸质出版日期： 2013 ，
DOI： 10.15980/j.tzzz.2013.05.023

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[1]林彦,鲁世强,邓莉萍,虞文,肖璇,姚敬.热暴露时间对Cr-9Nb合金组织与性能的影响[J].特种铸造及有色合金,2013,33(05):458-461.

Lin Yan, Lu Shiqiang, Deng Liping, et al. Effect of Thermal Exposure Time on Microstructures and Properties of Cr-9Nb Alloy[J]. Special Casting & Nonferrous Alloys, 2013,33(5):458-461.
[1]林彦,鲁世强,邓莉萍,虞文,肖璇,姚敬.热暴露时间对Cr-9Nb合金组织与性能的影响[J].特种铸造及有色合金,2013,33(05):458-461. DOI： 10.15980/j.tzzz.2013.05.023.

Lin Yan, Lu Shiqiang, Deng Liping, et al. Effect of Thermal Exposure Time on Microstructures and Properties of Cr-9Nb Alloy[J]. Special Casting & Nonferrous Alloys, 2013,33(5):458-461. DOI： 10.15980/j.tzzz.2013.05.023.

摘要

研究了Cr-9Nb合金在800℃真空环境下热暴露不同时间后组织与性能的变化。结果表明

随着热暴露时间的延长

合金的显微组织存在一定的粗化现象

致密度在前50h时有一定的增加

之后趋于平稳;维氏硬度变化不大

断裂韧度在热暴露100h后降至6.02MPa·m1/2;屈服强度、抗压强度及塑性应变在热暴露前10h时有一定的增加

之后有一定的下降

其中塑性应变下降较明显

热暴露100h后合金仍有高达1536MPa的屈服强度和2203MPa的抗压强度。

Abstract

Influences of thermal exposure time on the microstructure and properties of Cr-9Nb alloy with exposure in vacuum condition at 800 ℃ were investigated.The results show that the microstructure of the alloy is coarsened to some extent with the increase of thermal exposure.Relative density is increased slightly in the first 50 h and then tended to be stable.Change of Vickers hardness can be ignored in a whole time and fracture toughness is decreased to 6.02 MPa·m1/2 after 100 h thermal exposure.The yield strength

compressive strength and plastic strain are increased to a peak value in initial 10 h

and then declined.Besides

the plastic strain is decreased obviously from 18.3% to 10.3% after 100 h thermal exposure.In addition

alloy still keep a high yield strength of 1 536 MPa and compressive strength of 2 203 MPa.