针状体

当聚乙二醇的相对分子质量为2000时，制备的水杨酸针状体的直径范围为500nm~5μm。

Needle-like salicylic acid crystallites with diameters ranging from 500 nm to 5 μ m were prepared using polyethylene glycol with average molecular weight of 2000 as crystal growth inhibitor .

以相对分子质量为600的聚乙二醇为水杨酸晶体生长抑制剂时，制备的水杨酸针状体的直径范围为100nm~5μm。

When polyethylene glycol with average molecular weight of 600 was used as crystal growth inhibitor , needle-like salicylic acid crystallites with diameters ranging from 100 nm to 5 μ m were prepared .

针状包裹体是由于原料中的PbO杂质引起组分过冷而造成氧化铅和氟氧化铅小颗粒的定向排列。

The needle like inclusions are formed through constitutional supercooling due to the contamination of oxygen or lead oxide impurities in the raw materials .

试验结果表明，该钢电子束焊接接头焊缝为典型的粗大针状马氏体加残余奥氏体组织，HAZ（热影响区）为中温组织；

The tests results show that the microstructure of the welding line under the as welded condition is typical coarse spiculate martensite and retained austenite ;

此作用较小的原因与近β型Ti-1023合金水冷时细针状马氏体α〃析出倾向小及等温变形时位错等晶体缺陷密度较低有关。

The reason is that the martensite α″ is less after water quenching , and the density of dislocations and other crystal defects are lower after isothermal forging .

氟化铅晶体中针状包裹体的特征及形成机理

Characteristics and Forming Mechanism of Needle Inclusions in Lead Fluoride Crystals

硅灰石功能性针状粉体具有广泛的开发应用前景。

Wollastonite acicular powder possesses widely developing and applying foreground .

增大焊接电流使焊缝区组织粗大，晶粒内部针状马氏体增多，接头硬度、强度和塑性都有所提高。

Hardness and strength and ductility of weld joint had been increased .

激光淬火后齿面组织为理想的针状马氏体，齿面硬度高、疲劳强度高。

The laser-hardened tooth face has high hardness and high contact fatigue strength .

热影响区的金相结构均为细小的针状马氏体结构。

The smaller grains and needle-like α martensitic structure were found in the heat-affected zone .

在沉淀硬化的回火温度（485℃）下，淬火针状马氏体仍显示出原马氏体针；

At tempering temperature ( 485 ℃) of deposition hardening , the microstructure still shows martensites needle .

热影响区组织为少量针状马氏体+珠光体+网状渗碳体。

The microstructure in heat affected zone consists of a small quantity of acicular martensite , pearlite and cementite .

在小能量冲击磨损下表层有细针状马氏体析出，亚表层有大量滑移线形成，较高锰钢有更高的加工硬化能力。

There is faint needle martensite in the specimen surface , but there are the slip lines under the specimen surface .

结果表明：激光处理后表面迅速熔化和冷却，组织由珠光体+片状石墨组织转化为不同粗细的针状马氏体与残余奥氏体组织；

The results show that the structure of the surface change from pearlite + sheet graphite to speculate martensite of various thickness ;

窖泥老化常在窖壁出现白色颗粒状或针状结晶体，出现绿色或红色物质等现象。

Pit mud aging appears as the existence of white granule or acicular crystals on pit walls and further the emergence of green or red substances .

本文根据偏光显微镜观察，把存在于立方氟化铅晶体中的包裹体分为三种类型：针状包裹体、板状包裹体和无规则形包裹体。

Based on the observation with polarizing microscope , the inclusions in cubic PbF 2 crystals are classified as three types : needle like , tabular and irregular shape inclusions .

完全硬化区由细小针状马氏体、残余奥氏体和少量点状碳化物组成，过渡区由马氏体和回火索氏体（珠光体）组成；

The completely hardening region is composed of fine acicular martensites , residual austenites and a few dot-like carbonides and the transition region is made up of martensites and sorbites ( pearlite ) .

管材的化学成分符合质保书以及材料标准要求；但焊缝热影响区晶粒较母材粗大，并出现针状魏氏体组织。

The chemical constituents of the pipe are qualified to the standard requirement . However , the grain in the heat affected zone of weld is coarser than base metal , and the needle widmanstatten structure appears .

碳原子向晶界扩散引起界面附近钢侧柱状晶区，铁原子向钛中扩散引起界面附近钛侧无晶界区与针状马氏体区，钢表面脱碳加速这一过程的进行。

Columnar crystal areas are generated near the interface by carboatomic diffusing in to grain boundary , and acicular martensitic areas are generated near the interface by Fe atoms diffusing to Ti , and decarburation on steel surface promotes the process .

原因是奥氏体化温度较低的时候，奥氏体晶粒内化学成分不均匀，有利于马氏体按照孪晶的机制来形核和长大，从而形成外形不规则的针状马氏体。

The reason is when austenitizing temperature is low , the chemical composition of the austenite grain are uneven , Is it conducive to the martensite nucleation and growth according to the mechanism of the twin-martensite , thus forming the irregular acicular martensites .

如果氧化物杂质含量不是很高，则通过掺入过量脱氧剂、提高固液界面处的温度梯度和降低下降速度，可以比较有效地减少甚至消除晶体中的针状包裹体。

This type of inclusion could be avoided or reduced by doping with deoxidant , increasing temperature gradient near the interface between the crystal and the melt as well as slowing down the rate of crystal growth if the contents of oxide impurities are not very high .

结果表明，淬火加热温度偏高或加热时间过长，形成粗大的过热组织，即粗大针状马氏体和过热带状组织，导致后序磨削产生网状裂纹。

The cause of network cracks was analyzed . The results show that the overheated structures , that is , the coarse acicular martensite and overheated banded structures , because heating temperature is too high or holding time is too long , lead to network cracks after grinding .

冷却速度对Ti脱氧钢中针状铁素体形成的影响

Effect of cooling rate on the formation of acicular ferrite in Ti deoxidized steel

结果表明，焊缝金属化学成分和冷却速度是影响针状铁素体（AF）的主要因素，应力对焊缝金属相变的影响很小。

The composition and cooling rate of the weld metal are the main influencing factors on acicular ferrite .

针状铁素体/马氏体高强度低屈强比双相钢的EBSD研究

The EBSD Study on an Acicular Ferrite / Martensite Dual-Phase Steel with High Strength / Low Yield Ratio

X70微合金管线钢组织中针状铁素体细化机制的研究

Study on the grain refinement mechanism of low carbon micro-alloyed steels for line-pipe applications

研究结果表明，针状铁素体的微观结构特征，对提高具有针状铁素体为主的混合组织的管线钢的强韧性行为和抗H2S性能具有非常重要的作用。

Experimental results showed that the microstructural characteristic of acicular ferrite plays important roles in enhancement of strength toughness behavior and H2S corrosion resistance of pipeline steels with acicular ferrite dominated mixed microstructure .

等温淬火球墨铸铁（AustemperedDuctileIron）是采用等温淬火热处理工艺获得的针状铁素体和高碳奥氏体为主要基体组织的球墨铸铁，简称ADI。

ADI ( Austempered Ductile Iron ) is a kind of ductile iron with acicular ferrite and high carbon austenitic as its main base structure , which is obtained by the austempering process .

X70针状铁素体管线钢的优点暨恶劣环境下油气输送管道工业的发展

The Advantage of Spicular Ferrite Pipeline Steel X70 The Development of Transmitting Oil Gas Pipeline Industry in Atrocious Weather

结果表明：均匀细小的针状铁素体为主的显微组织具有优良的抗SSCC性能；

The result showed that the microstructure dominated by fine and homogeneous acicular ferrite had the better resistance to SSCC .