冷却速度对铸造Fe-20Cr-2.5Mo-1Ni铁磁性合金性能的影响  

Influence of Cooling Rate on Properties of Fe-20Cr-2.5Mo-1Ni Cast Ferromagnetic Alloys

作　　者：晏尚华 陈康为 李宁[1] 颜家振[1] 石浩江[1] 董鑫 曹美娇 Yan Shanghua;Chen Kangwei;Li Ning;Yan Jiazhen;Shi Haojiang;Dong Xing;Cao Meijiao(School of Manufacturing Science and Engineering,Sichuan University,Chengdu 610065;Changcheng Special Steel Company,Pangang Group,Jiangyou,Sichuan 621701)

机构地区：[1]四川大学制造科学与工程学院,成都610065 [2]攀钢集团江油长城特殊钢有限公司,四川江油621701

出　　处：《特钢技术》2018年第1期4-7,43,共5页Special Steel Technology

摘　　要：铸造Fe-20Cr-2.5Mo-1Ni合金试样在真空条件下进行1000℃保温1h阻尼化热处理后,分别进行随炉冷却、真空气淬与水淬处理。通过TA Q800动态机械分析仪(DMA)等设备研究了合金在不同冷却速度处理之后的阻尼性能和力学性能变化,并分析冷却速度对合金微观结构、磁畴结构的影响。结果表明,冷却速度的快慢对铸造Fe-20Cr-2.5Mo-1Ni合金晶粒尺寸与相组成没有影响,合金为单相铁素体。然而,随炉冷却的试样中发现尺寸较大的FeCr(σ)析出相,水淬试样σ脆性相较少,冲击性能提高。此外,随炉冷却试样磁畴结构呈细小的针状结构与90°结构,水冷试样磁畴结构为细小的树枝状结构与针状结构。随冷却速度的提高,内应力和磁畴结构发生变化使内耗值降低。The samples of Fe-20Cr-2.5Mo-1Ni alloy were heat treated by furnace cooling, vacuum gas quenching and water quenching respectively after holding at 1000 ℃ for 1 h under vacuum atmosphere. The damping performance,mechanical properties and the effect of different cooling rates on the microstructure and magnetic domain structure of the alloys were investigated by means of TA Q800 dynamic mechanical analyzer（DMA） etc. The results show that the cooling rate has no effect on the grain size and phase compositin of the Fe-20Cr-2.5Mo-1Ni cast alloy, and the phase of the alloys is ferrite of single phase. Moreover, large size FeCr（σ） precipitated phase was observed in the sample cooled in furnace, while the water cooled sample with less σ phase and showed high impact toughness. In addition, the magnetic domain structure of the sample cooled in furnace was needle-like coarse structure and that of the sample cooled in water was small dendritic structure. The internal friction values decreased with the magnetic domain structure change and internal stress.

关 键 词：Fe-Cr基阻尼合金 冷却速度 力学性能 阻尼性能 微观结构 

分 类 号：TG136.1[一般工业技术—材料科学与工程]