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模锻件折叠的形成及防止邵阳高等专科学校(422004)宁爱林模锻件有许多种缺陷,其中最常见,也是最令人头痛的是折叠。某些模锻件,能否解决其折叠问题,往往就是能否生产的问题。为此,本文分门别类地分析了模锻件折叠的形成,并指出其预防方法。1拔长工步图1a... 相似文献
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强化均匀化对7B04铝合金铸态组织与性能的影响 总被引:8,自引:4,他引:8
研究了强化均匀化 (大幅度延长均匀化时间 ,略高于传统均匀化温度 )对 7B0 4铝合金铸态组织和性能的影响。结果表明 :在 4 6 8℃× 4 8h的均匀化制度下 ,材料的铸态组织得到明显的改善 ,非平衡凝固形成的多相组织基本上转变成均匀化组织 ,材料的伸长率较传统均匀化提高 14 % ,为后续压力加工和热处理奠定了基础。 相似文献
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采用复合强韧化工艺,对7A04铝合金的组织和性能进行了研究。结果表明,通过熔体净化、晶粒细化、强化均匀化、锻造及分级固溶处理能明显改善和提高7A04高强铝合金的综合性能,而且可以大大减少均匀化处理的保温时间。 相似文献
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The effects of heat treatment on the microstructure and mechanical properties of two alloys, namely Al- 12.2%Zn-2.48%Cu-2.0%Mg-0.15%Zr-0. 166%Ag(alloy 1), and Al-9.99%Zn-1.72%Cu-2.5%Mg-0.13%Zr(alloy 2) were investigated. The results show that low temperature aging after promotive solution treatment can increase elongation without the loss of strength for the studied alloys. The optimum aging treatment (T6) for alloy 1 and alloy 2 is 100 ℃/80 h and 100 ℃/48 h, respectively. Compared with other heat treatment alloys, alloy 1 and alloy 2 show super-high tensile strength up to 753 MPa and 788 MPa, remaining 9.3% and 9.7% elongation under T6 condition, respectively. During aging, trace addition of Ag enhances the formations of GP zone and metastable phase, and stabilizes GP zone and metastable phase to a higher temperature. Trace addition of Ag prolongs the aging time of reaching the peak strength and delays over-aging condition of the alloy. However, trace addition of Ag promotes the formation of coarse constituent in the alloy and consumes hardening alloying elements of Zn and Mg. Moreover, the addition of the transition element Zr in 7000 series super-high alloy forms incoherent Al3 Zr dispersoid which can serve as nucleation sites for nonuniform precipitation of η phase during aging process. The higher the aging temperature, the greater the tendency for nonuniform precipitation of η phase. 相似文献
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过时效温度对2024铝合金形变后的再结晶行为和力学性能的影响 总被引:2,自引:2,他引:0
采用力学性能检测和透射电镜(TEM)观察,研究了过时效温度对2024铝合金形变后的再结晶行为和合金力学性能的影响。结果表明:过时效温度对合金力学性能的影响较大,在250~350℃的过时效温度范围内,随温度升高,合金强度提高,350℃时效时合金的性能最好,此时σb=580MPa,δ5=9.2%,比传统处理工艺(T62)分别提高32%和84%。其原因是过时效温度间接地影响了合金随后固溶再结晶的晶粒大小。因此,为了达到细化晶粒的目的,必须严格控制过时效温度。 相似文献