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。
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 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。
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 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。
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。
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 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。
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。
The mechanism of refining the pure Al and its alloys is discussed. The grain refinement efficiency and characteristics of the most popular grain refiners are also discussed.
从细化机理入手论述了铝及其合金的细化效果以及常用的晶粒细化剂的优缺点。
The results show that, increasing cooling rate, pre-deformation and grain refinement are useful for spreading of the non-equilibrium microstructure around the primary grains.
结果表明：增加冷却速率、预变形处理和晶粒细化有利于初始凝固组织中存在的非平衡组织的分散细化。
The grain refinement mechanisms of undercooled DZ125 superalloy melt were systematically investigated by the method of molten salt purification combined with cycled superheating.
采用熔盐净化剂与循环过热相结合的方法，对DZ125高温合金晶粒细化机制进行了系统研究。
The ways and the mechanisms of grain refinement in Cu-Base shape memory alloys are especially described. The effect of grain refinement on mechanical and memorial properties are discussed.
介绍了铜基形状记忆合金的晶粒细化方法及机理，论述了晶粒细化对铜基形状记忆合金力学性能和记忆性能的影响。
The results indicate, the main factor for grain refinement is cooling intensity, its polar odds is 57.946 and reliability is 99%. The next facts are preservation time and pouring temperature.
研究结果表明，冷却强度是晶粒细化的最主要因素，极差为57.946，可信度达到99%，其次是保温时间与浇注温度。
Advantages: it can destroy the ingot casting, steel grain refinement, and eliminating the defect in microstructure, thus making steel tissue close-grained, with improved mechanical properties.
优点：可以破坏钢锭的铸造组织，细化钢材的晶粒，并消除显微组织的缺陷，从而使钢材组织密实，力学性能得到改善。
The characteristics of strain enhanced transformation and ferrite grain refinement are investigated under different processing parameters by thermal simulating tests of Q235 plain carbon steel.
在热模拟单向压缩实验中，通过形变参数的变化考察了Q 235碳素钢应变强化相变的基本规律及铁素体晶粒细化效果。
The main mechanism of magnesium alloy refinement are dynamic recrystallization and intragranular refinement, when the grain refinement is to a certain extent, the grain will no longer be refined.
镁合金细化机理主要为动态再结晶细化和晶内细化两种机制，当晶粒细化到一定程度，晶粒将不再细化。
Grain refinement during asymmetric rolling was studied. The result showed that the grains of asymmetric rolled product are finer than that of symmetric rolled product in the same reduction.
研究了不对称轧制晶粒细化问题，结果表明，与对称轧制相比，在相同的变形量下不对称轧制可以使晶粒更细。
Grain refinement during asymmetric rolling was studied. The result showed that the grains of asymmetric rolled product are finer than that of symmetric rolled product in the same reduction.
研究了不对称轧制晶粒细化问题，结果表明，与对称轧制相比，在相同的变形量下不对称轧制可以使晶粒更细。
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