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。
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.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2013年第5期458-461,共4页
Special Casting & Nonferrous Alloys
基金
国家自然科学基金资助项目(51074092)
江西省自然科学基金资助项目(20114BAB216012)
江西省研究生创新基金资助项目(YC2011-S099)
南昌航空大学研究生科技创新基金资助项目(YC2011010)
