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21.已知铁的体心立方晶格的致密度为0.68,面心立方晶格为0.74,碳在哪一种晶格中的溶解度大?为什么?22.有一铝板,用凿子打一孔,然后400℃退火,观察孔的周围晶粒变化情况,并解释其原因。23.有一薄钢板,深冲成型后发现表面光洁度变差,呈桔皮状,试说明其产生的可能原因。24.冷、热加工后都形成纤维组织,它们有何区别?25.分析铁和锡在室温形变后的组织,并解释其原因。26.纯金属在什么条件下结晶,才会形成树枝状晶体?
21. It is known that the density of the body-centered cubic lattice of iron is 0.68, the face-centered cubic lattice is 0.74, and the solubility of carbon in which lattice is large? Why? 22. There is an aluminum plate with a chisel to make a hole, Then annealed at 400 ° C to observe the change of crystal grains around the hole and explain the reason. 23. There is a thin steel plate, after deep-drawn molding surface finish deteriorated, showing orange peel, try to explain the possible causes. 24. Cold and hot forming are formed after the fibrous tissue, what is the difference between them? 25. Analysis of iron and tin at room temperature after deformation of the organization, and explain the reasons. 26. Under what conditions pure metal crystallization, will form dendritic crystals?