Low temperature toughness is remarkably improved by grain refinement.
晶粒细化显著提高了钢的低温冲击韧性。
It is shown that equal channel angular extrusion is a new method of grain refinement.
实验证明：等通道转角挤压技术是细化晶粒的新方法。
And the precipitation of Nb has the effect of precipitation hardening and grain refinement.
钢中铌的沉淀析出具有沉淀强化和晶粒细化的作用。
The most effective approach for grain refinement is to lower the finish rolling temperature.
降低终轧变形温度对组织细化是最有效的。
The results show that the instrument can reach the demand of ultrasonic peening grain refinement.
试验结果表明该设备可以满足超声表面晶粒细化冲击的要求。
The grain refinement rate of the ingots increases with the increase of ultrasonic application time.
随着超声处理时间的增加，铸锭的细化率急剧增加。
The mechanism of the self grain refinement of metals has been studied onthe heredity theory of metals.
根据金属遗传原理探讨了晶粒自身细化机理。
One of the main reasons of grain refinement is that radiation increases for hot steel with magnetic field.
强磁场作用于相变时引起的高温钢辐射散热系数的增加是导致晶粒细化的主要原因之一。
The main factors that affect the grain refinement are heating and cooling rate, holding time and cycle index.
影响细化效果的主要因素有：加热速度、保温时间、冷却速度和循环次数。
The grain refinement strengthening not only enhances strengthening of steel, but improves toughness and plastic.
而其中的细晶强化不但可以提高钢的强度，而且还可以提高其塑性和韧性。
The strengthening mechanism was proved as the result of the combination of surface deformation and grain refinement.
其强化机理为表面强化效应及品粒细化效应相结合。
The morphology of the powders was studied by SEM and EDS, on which the discussion of grain refinement mechanisms is based.
利用SEM和能谱分析，研究了其微观形貌的变化，并对球磨粉末的晶粒细化机理进行了一定的研究。
The modeling results can be used to investigate the grain refinement mechanism for the electrolytic low-titanium aluminium alloy.
对于研究电解低钛铝基合金的细化机理提供了数值基础。
On the basis of the above, gear steel's hardenability, grain refinement and nonmetal inclusion control elaborate have been discussed.
在此基础上对钢的淬透性影响因素、晶粒细化及非金属夹杂物控制等进行了详细研究。
The grain refinement and formation of intermetallic play an important role for improving the performance in the laser cladding layer.
激光熔覆层中的晶粒细化和金属间化合物的形成对性能的提高起到重要作用。
The grain refinement begins from the center ellipsoidal zone, and then gradually expands to the vertical edge zone and conical contact zone.
细化首先开始于易变形区，再相继扩展到纵向棱边区和接触锥形区。
The effects of modification, grain refinement, polystyrene pattern, pouring temperature on aluminum alloy porosity in LEC process is studied.
探讨了铝液变质、晶粒细化、浇注温度及聚苯乙烯模样等对消失模铝铸件针孔的影响。
The experimental results show that the grain refinement effects of titanium added to pure aluminum by different methods are all very obvious.
结果表明，不同加钛方式对纯铝都有较强的细化作用；
The mechanism of grain refinement during cast-rolling process with ultrasonic treatment is discussed, and the presented problems are pointed out.
探讨超声波空化现象及声流作用对铸轧铝板带组织细化作用的机制。指出目前超声波铝铸轧过程中存在的问题。
In the final heat treatment using circular quenching grain refinement effect is good, three times quenching refinement of grain can achieve 10 levels.
在最终热处理采用循环淬火晶粒细化效果好，三次淬火细化的晶粒可达到10级。
It was also found out that proper re element addition could increase the toughness of the weld metal and improve its microstructure by grain refinement.
适量的稀土元素可改善焊缝金属组织的形态、细化晶粒、提高韧性。
The present situation of development and application of master alloy refiners and mechanism of grain refinement in aluminum alloys was analyzed and discussed.
分析讨论了中间合金对铝合金晶粒细化处理的研究与应用现状及其细化机理；
It reviews the optimization measures of Al-Si piston alloy, including kinds, chemical composition, grain refinement, modification, alloying and heat treatment.
评述了铝硅活塞合金的种类，化学成分，晶粒细化，变质处理，合金化和热处理工艺等优化手段。
The research about the effects of mechanical physics, physical fields, grain refiners on the grain refinement of Aluminum and alloys is analyzed and discussed;
分析讨论了机械物理、物理场、晶粒细化剂对铝及合金晶粒细化处理的研究及其细化机理；
The grain refinement of aluminium with no alloy pollution can be achieved by adding rapidly solidified sheet into aluminium melt with same chemical composition.
采用快速凝固技术获得激冷片，将其加入同成分铝液中以实现对铝的无合金污染的晶粒细化。
Through the microstructure observation and hardness test of extrusion specimen, the grain refinement effect of AZ31 magnesium alloy under ECAP process was studied.
对挤压后的试样进行显微组织观察、硬度测试，研究等通道挤压工艺（ECAP）对AZ31镁合金的晶粒细化效果。
Superalloys is a sort of hardly cutting material, the influence of grain refinement to machinability of superalloys was studied through contrasting different grain.
高温合金属于难加工材料，本文对比研究了高温合金样件晶粒度对其加工性能的影响。
Surface grain refinement of turbine blades in Ni based superalloy K18 were studied by comparison of experimental results in different alloys and mold surface materials.
选用K 18合金和纯金属镍及不同的面层细化料，通过实验对比研究了镍基高温合金叶片表面晶粒细化机理。
In order to improve the cold fatigue, hot fatigue and mechanical fatigue resisting performance of the moving blade, grain refinement is required for the casting surface.
为了提高动叶片的抗冷热疲劳和抗机械疲劳的性能，铸件表面需进行晶粒细化。
In order to improve the cold fatigue, hot fatigue and mechanical fatigue resisting performance of the moving blade, grain refinement is required for the casting surface.
为了提高动叶片的抗冷热疲劳和抗机械疲劳的性能，铸件表面需进行晶粒细化。
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