渗碳体

过共析钢温变形过程中的组织演变Ⅱ.渗碳体的球化及Al的影响

MICROSTRUCTURE EVOLUTION OF HYPEREUTECTOID STEELS DURING WARM DEFORMATION ⅱ . Cementite Spheroidization and Effects of Al

结果表明，高锰钢基复合材料的显微组织由TiC颗粒，奥氏体和合金渗碳体组成。

The results show that microstructure of high manganese steel matrix composite is made of TiC particles , austenite and alloy cementite .

珠光体组织的疲劳裂纹扩展方式可分为A，B，C三种类型。A型为裂纹同时横切多层铁素体片和渗碳体片而扩展；

Observations were demonstrated of 3 different types of the fatigue crack propagation of pearlitic structure : type A & the crack intersects the multiple ferrites and cementites simultaneously ;

磁化力F是加速渗碳体溶解和碳扩散的驱动力，通过推导可以得出单位体积力F的表达式。

The magnetization force F , which is the driving force for the accelerating of the dissolution and diffusion of the carbon , can be given by formulas .

研究表明：在渗碳体（FeC）-奥氏体（A）界面，珠光体中渗碳体优先形核于A内凹处的内侧。

As showed in this investigation , the cementite nucleating in pearlite prevails at the inside of concave boundary of austenite on Cementite ( Fe_3C ) - Austenite ( A ) boundaries .

指出在QP钢的处理工艺中，淬火温度的选择和抑制渗碳体析出的重要性，并探讨了QP钢在汽车上的可应用领域。

The importance of the choice of quenching temperature and suppression of carbide precipitation for Q P process is pointed out and the application of Q P steel in vehicle is discussed .

La改变珠光体的形态、分布和数量，减小珠光体的片层间距和渗碳体的片厚。

The dissolved La in the steel has the effects of increasing the amount of ferrites , and reducing the pearlite lamellar spacing and the cementite thickness .

T12钢渗碳体球化处理及其显微组织

Spheroidizing Process for Cementite of Steel T12 and Its Microscopic Structure

SEM分析表明，施加强磁场能够显著地提高渗碳体分解和碳扩散的速度。

The SEM micrographs of the specimen annealed with and without the high magnetic field show that the dissolving of cementite and diffusion of carbon are increased greatly in the high magnetic field .

在C方式ECAP变形中，珠光体钢65Mn中的渗碳体以周期性的弯曲变形，周期性的剪切变形，剪切断裂等形式协调ECAP的强烈塑性变形。

In ECAP route C , in order to accommodate the severe shear deformation the deformation form of lamellae cementite in pearlitic steel include periodical bending , periodical shearing and shearing fracture etc .

若铸态组织中存在少量莱氏体，应770℃保温1h，以消除渗碳体，再进行740℃保温3h的石墨化退火处理。

As a little ledeburite in the cast structure existed , it was heated to eliminate the cementite 1 hour at 770 ℃, following the graphitizing annealing 3 hours at 740 ℃ .

Ti和C可以直接在液相中反应形成TiC，并可作为渗碳体的结晶核心，使一次渗碳体和共晶渗碳体发生粒化和细化，从而避免连续网状碳化物的形成。

The alloying elements Ti and C can form TiC directly in the melt which acts as nucleus of cementite and causes both primary and eutectic cementite granulated and refined . So the cementite network in this steel can be eliminated .

XRD分析显示强塑性变形引起SWRH72A钢丝中渗碳体回溶，部分碳原子溶入铁素体形成过饱和铁素体，过饱和铁素体中含碳量约0.34at%。

The XRD analysis shows that severe plastic deformation causes partial of cementite decomposition and dissolution of carbon into ferrite up to 0.34 at % .

通过TEM分析可知，针状铁素体组织典型的形貌为非常微细的亚结构、高位错密度以及部分细板条铁素体，基体上弥散分布着M/A岛和渗碳体。

TEM images showed that the typical morphology of acicular ferrite is a very fine sub-structure with high dislocation density and part of ultra-fine ferrite , of which the small M / A islands and cementite are dispersing on the matrix .

在不预热情况下，通过调整熔敷金属Cu和Ni的含量，改变铸铁激光熔敷层内奥氏体相与渗碳体相体积分数，分析了奥氏体相体积分数对熔敷层抗裂性的影响。

In the condition of no preheating , the contents of Cu and Ni in Cu-Ni-V-C laser cladding layers were changed to adjust the volume fractions of austenite and cementite , and the effect of volume fraction of austenite on the cracking resistance was analyzed .

在退火态45钢表面，Ni-P合金镀层优先在晶界及渗碳体表面形核.由于珠光体组织中含有渗碳体相且具有比较高的晶界密度，因而在沉积初期镀层优先形核和生长。

As the pearlite in it contains cementite phase and has high crystal boundary density , the nucleation and growth of deposits prefer to occur at the pearlite at the beginning during deposition on the surface of annealed 45 steel .

ECAP变形中珠光体组织中的片状渗碳体弯曲成波纹状，4道次后，大部分渗碳体片仍未断开，表现出很强的塑性变形能力。

The cementite in the pearlite was deformed into the wave morphology by ECAP , most of which were not broken after the fourth pass , so they had the great ability of plastic deformation .

对于完全是片层珠光体组织的T8钢，渗碳体片层表现出一定程度的塑性变形能力，并随片层间距的减小变形能力增强。

In specimens of eutectoid steel T8 , the cementite lamellae may be plastically deformed to some extent , and its tendency increases with the decrease of interlamellar spacing .

本文采用X射线衍射方法、元素分析和热重分析研究了工艺过程存在的黑色杂质，并做出了理论解释，认为黑色物质是炼钢工艺中的渗碳体（Fe3C），不是本工艺中产生的。

The reaction stops until pH reaches the end of point 4.2.The XRD , element-analysis and TG are applied in the study to explore the dark substance in the process . The substance is considered as cementile ( Fe3C ), which is not generated in this process .

用扫描电镜（SEM）、透射电镜（TEM）并结合图像分析方法研究了分别添加1wt%Mn和1wt%Si对Fe-0.8C共析珠光体钢重度冷轧及退火后显微组织以及渗碳体颗粒长大动力学的影响。

The influence of Mn and Si on microstructure and growth kinetics of cementite particles in severely cold-rolled and annealed Fe-0.8C steel was investigated by using scanning election microscopy , transmission election microscopy and an images analysis approach .

通过对SWRH82B盘条的拉伸断口进行分析，认为网状渗碳体和大颗粒脆性夹杂物等缺陷是引起断口异常的主要原因。

The main causes which lead to tensile abnormal fracture of SWRH82B steel rods are the network cementite and the big brittle inclusion .

对变质铸态中锰钢进行热力学计算、晶体结构分析，透射电镜与电子探针研究，发现SiO2完全可以作为层片状共生共晶体（共晶两相为奥氏体与合金渗碳体）的非自发核心。

By calculation of thermodynamics , analysis of crystal structure and study of TEM and eletron probe , it is first discovered that SiO_2 can be acted as one of the heterogeneous nuclei for lamellar intergrowth eutectic ( austenite and cementite ) crystallizing in modified as-cast medium manganese steel .

本文用FE3C8500程序计算了渗碳体的结构振幅，据此，说明了渗碳体的结构消光条件。

The structure amplitudes of Fe_3C are calculated by using the program FE3C8500 , then the condition of structure extinction is introduced in this paper .

锤头浇注后，于850℃开箱落砂油淬+260℃×2h回火，得到共晶渗碳体、少量片状石墨、马氏体及残余奥氏体的混合组织，硬度达HRC58～61，韧性满足使用要求。

The temperature of shakeout , and tempered at 260 ℃ for two hours . The eutectic cementite , a few of flake graphite , martensite and retained austenite were obtained . The hammer hardness reached the level of HRC58 ~ 61 and its toughness meets also the operating requirement .

除奥氏体铸铁外，多数铸铁在1040K附近比热容出现峰值，有些铸铁在490K附近存在渗碳体居里点，比热容在该处也出现峰值。

Most cast iron has maximum specific heat at about 1 040K expect austenitic cast iron . Some kind of cast iron have its cementite curie point at about 490K , their specific heat is the maximum there .

共析渗碳体结构与变形行为的透射电镜研究

TEM Investigation on the Microstructure and Deformation Behavior of Eutectoid Cementite

这为后来渗碳体的加速溶解和球化打下了基础。

This makes the accelerating dissolution and spheroidization of cementite easy .

在不断冷却的过程中，开始出现铁素体和渗碳体。

Ferrite and pearlite appear during the process of continuous cooling .

321/Qd370qD爆炸焊接界面渗碳体的微观结构

Microstructure of cementite beside interface in 321 / Qd370qD explosive welding

一个是碳化物（类似于渗碳体或合金渗碳体）。

The another is carbide ( similarly cementite or alloy cenentite ) .