It is pivotal to improve the formation and distribution of carbides in the solidification microstructure of composite rolls of high speed steel 采取必要的措施，预先改善铸态高速钢中原始碳化物的大小和分布在复合轧辊用高速钢中是很为关键的。
The strength of extension of low carbon ductile cast iron can reach 750mpa in casting state , the impact ductility can reach 20j / cm2 . the diameter of graphite nodule is 5 - 20 ( am , the base body is consisted of pearlite - 低碳球铁在铸态下的抗拉强度可达750mpa ，冲击韧性可达20j cm ~ 2 ，其中石墨球直径在5 20 m ，基体以珠光体为主，有少量的铁素体与渗碳体。
5 . the comprehensive capacities of the azsm alloy were markedly promoted than that of the as - cast azsm alloy which was aged at 200 ? , air - cooled and furnace - cooled after solid - solution , aged at 90 ? and aged in nature after solid - solution 5 )铸态azsm合金经200时效3小时、固溶4小时后空冷和炉冷、 400固溶-水淬90时效和自然时效的综合性能较铸态有显著的提高。
Increasing the cooling velocity and additions of nb and zr can refine the a - fe dendrites in as - cast alloys , decrease the amount of a - fe phase after homogenization treatment . as a result , the magnetic . properties were improved 提高铸锭的凝固速度及添加nb和zr可以促进铸态合金内- fe相的晶粒细化及均匀分布，减少均匀后残留的- fe相，提高均匀化的效率和质量，从而提高磁体的矫顽力。
Pure rare earth elements , lanthanum and cerium , are added to pure copper , then the inner mechanism and influence of rare earth addition on its absorptivity in copper casting microstructure specific resistance and mechanical properties are studied in this paper 在纯铜中加入纯稀土元素la 、 ce ，研究稀土元素在纯铜中的作用机理、吸收率的影响因素以及稀土元素对铸态组织、导电性、力学性能的影响。
Abstract : this paper points out that the properties of casting t reated by vibrating ageing is superior in comparing with that in the as ca st state and heat ageing state through analyzing the residual tress distri buting , mechanical properties and resistance to deformation 文摘:对铸件的铸态、热时效态和振动时效态在内应力分布，力学性能及抗变形能力方面的特性进行分析对比，发现振动时效态均优于前2者。
5 . under the experimental conditions , the tensile strength of directional solidification cu - cr alloy is markedly higher than the casting cu - cr alloy . and the analysis of rupture part on sem shows the gliding series of directional solidification cu - cr alloy is more than the casting cu - cr alloy 5实验条件下定向凝固cu - cr合金的抗拉强度明显高于铸态cu - cr合金，扫描电镜( sem )断口表明定向凝固cu - cr合金断口滑移系多于铸态cu - cr合金。
Through analyzing the phase composition and microstructure of sm2fe17 - xnbx alloys ( x = 0 . 5 , 1 , 2 , 3 ) , we study the influence of the addition of element nb on the microstructure of sm2fe17 alloys . the results show that the as - cast structure of sm2fe17 - xnbx alloys can be improved effectively 本文重点研究了添加过渡族nb元素对sm - fe合金相组成和微结构的影响，实验研究发现：添加微量的nb元素可以有效的改善sm - fe合金铸态组织的显微结构。
The age hardening characteristic of as - cast cu20ni20mn and cu20ni35mn alloys and the interface characteristic between the alloy and cast tungsten carbide were studied , and on the basis of this study , composites of cu - ni - mn alloy reinforced with different volume fraction ( 0 - 45vol . % ) and different size ( 42 - 362 m ) of cast tungsten carbide particles were made by vacuum hot - pressing liquid sintering technology . pin on disk two body abrasion tests have been performed with different size of sic abrasive under different loads 本文研究了铸态cu20ni20mn和cu20ni35mn合金的时效硬化特性及其与铸造碳化钨的界面特性，并在此基础上以不同尺寸( 42 362 m )的铸造碳化钨颗粒为增强体，采用真空热压液相烧结技术制备了不同颗粒含量( 0 45vol . )的铸造碳化钨颗粒增强cu - ni - mn合金基复合材料；以不同粒度的sic为磨料，在不同载荷条件下利用销?盘磨损试验机测试了复合材料的二体磨料磨损性能。
Sintering speed increased greatly with the help of great quantity of heat of the molten iron , the great quantity of heat sent out from the carbonizing reaction and a little quantity of liquid , this sintering type is an instantaneous sintering , the sintering compacting can carry completely in a few minutes , the degree of sintering compacting is very high . ( 6 ) the vc - fe surface composite has high rigidity , it ' s rigidity exceeds 60hrc , under condition of dry sliding friction and overloading 铸造烧结时，过热铁水的巨大热流密度冲击、粉料压坯中的碳化反应的放热以及压坯中少量液相的产生使压坯的烧结速度大大提高，此时属瞬间液相烧结，在十几分钟内烧结过程即可完成，可达到很高的致密化程度。 ( 6 )铸态下vc一fe表面复合材料具有很高的硬度，其铸态硬度) 60hrc 。
