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签到天数: 195 天 连续签到: 1 天 [LV.7]常住居民III
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发表于 2019-1-19 21:35:40
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可以参看《EN 1563-2012球墨铸铁件标准》附录A,“A.2.3 Graphite structure
3 z, j0 |7 J" I; IThe graphite structure should be mainly of form V and VI in accordance with EN ISO 945-1.
2 t3 q; Y/ C& T3 T* y/ ^Due to the increased silicon content, these solid solution strengthened ferritic spheroidal graphite cast irons
. T8 d/ O! A1 fmay show some compacted graphite (form III) in heavy sections. However ferritic matrices are, also for higher/ E1 M* L8 y% H" ~ `
levels of solution strengthening by silicon, much less sensitive to reduced nodularity than cast irons+ ?2 _) ~; s% i* `
strengthened by substantial amounts of pearlite.A level of approximately 20 % of form lll can be accepted, provided the remainder is mainly of form V and VI,
) b4 }: |) L9 Yto fulfil the minimum tensile properties specified in this European Standard.”固溶强化铁素体球墨铸铁,消除碎块状石墨困难,在工艺上增加一些措施(冷却速度、浇注温度、CE、孕育、预处理,控制促进碎块状石墨微量元素,添加抑制碎块状石墨微量元素)可以缓解。 |
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