回火马氏体

与调质回火马氏体组织不同，氧含量对铁素体-珠光体组织的疲劳性能没有明显的影响。

Unlike that of tempered martensite structure , there is little effect of oxygen content on the fatigue properties of ferrite-pearlite steel .

过热会造成在本体金属中形成过回火马氏体（OTM）或者欠回火马氏体（UTM）。

Overheating can result in over tempered martensite ( OTM ) or untempered martensite ( UTM ) formations in the base metal .

5Cr4Mo3SiMnVAl基体钢回火马氏体脆性

Tempered Martensite Embrittlement in a 5Cr_4 Mo_3 Si Mn VAl Matrix Steel

回火马氏体中孪晶应变场的陷阱能为74.4KJ／mol；

The one of twin from difference between bainite and martensite is 74 . 4KJ / mol.

10CrMo910热影响区和T91热影响区的组织分别为索氏体和细的回火马氏体，韧性较好。

The microstructures of heat affected zones of T91 / 10CrMo910 are tempered sorbite and thin tempered lath martensite and the toughness is good .

结果表明，送料节拍由原来的12个／min提高到20个／min；在回火马氏体基体上保留有少量小块状铁素体，保证了螺栓的高强度和高塑性的良好配合。

The results showed that if the feeding pace was increased to 20 pieces per minute from original 12 pieces per minute and some small granular ferrites was remained on the tempered martensite matrix , a good match of high strength and high plasticity of bolts can be obtained .

基体钢（65Nb）冷镦模具经超低温工艺处理后微观组织发生了变化，即从回火马氏体中析出碳化物微粒，残余奥氏体转变成马氏体并析出微细碳化物。

The microstructure change of matrix steel ( 65Nb ) cold heading die by cryogenic technological treatment is researched in this paper , i.e. the carbide micro granules are separated from tempering martensite , retained austenite changes to martensite and separates fine carbide .

细小弥散碳化物与回火马氏体脆性

Fine Dispersive Carbide and Tempered Martensite Embrittlement

钢中回火马氏体的形变亚结构

Deformation Substructure of Tempered Martensite in Steels

回火马氏体脆性的机制

Mechanism of temper martensite embrittlement

结果表明，冷轧工作辊在粗磨过程中因磨削过热，使其表层的回火马氏体转变为回火托氏体，改变了表面应力状态，导致表面出现裂纹。

It is supposed that superheat generated during rough grinding changes surface stress , resulting in the surface fissures .

焊缝显微组织主要是回火马氏体和块状δ铁素体组织。

The microstructure of the weld metal was found to be tempered martensite with a little of delta ferrite .

建立了磷在奥氏体晶界偏聚的模型。分析了回火马氏体脆性的机制。

Segregation model of austenite boundary are established , mechanism of tempered & martensite embrittlement and bainite transformation are analysed thermodynamically .

随着加工温度升高，工件表面逐渐产生回火马氏体，这是造成工件表面硬度下降的主要原因。

Tempered martensite was gradually generated as the cutting temperature increased , which is the main cause of the decrease in the hardness .

研究了热轧后水淬终止温度对自回火马氏体钢微观组织和力学性能的影响。

The effect of interrupted quenching temperature on the microstructure and mechanical properties of a direct quenched and self tempered martensitic steel has been investigated .

热影响区的显微组织主要为回火马氏体；熔合线结合良好，组织均匀。

The microstructure of the heat-affected zone is mainly tempered martensite , and with uniform distribution of grains and good combination in the fusion line .

应用透射电子显微术研究低碳及中碳合金钢回火马氏体的形变位错结构随拉伸加载过程的演变。

The evolution of deformation dislocation structure during the tensile loading was examined by transmission electron microscopy in the tempered martensite of low and middle carbon alloy steels .

研究结果表明，在硬质回火马氏体基体上均匀分布着适量（10～20%）细小条粒状软韧相铁素体对耐磨料磨损性是有益的。

Experimental results show that the fine distributed ferrite phase in a proper proportion ( 10-20 % ) in the hard matrix of tempered martensite benefits the abrasive wear resistance .

热处理后衬板的显微组织为针状回火马氏体+弥散分布的碳化物+残余奥氏体，其中碳化物大多为点球状和短杆状。

After 920 ℃ quenching + 350 ℃ tempering , the microstructure of test materials was acicular martensite + carbide + dispersed residual austenite , which carbide were mostly spherical or short pole shape .

试样经过正火+两次回火热处理后，组织由板条回火马氏体和弥散分布的逆变奥氏体组成，回火马氏体随含钛量增加逐渐减少，逆变奥氏体逐渐增加。

After normalizing + tempering twice , all samples are composited of lath tempered martensite and dispersed reverse austenite . The tempered martensite content gradually reduce with the increase of the titanium , and reverse austenite content increase .

实验结果表明，对于珠光体+铁素体、淬火马氏体及回火马氏体3种组织，珠光体+铁素体的超声波衰减系数最大，回火马氏体的最小；

The results show that the microstructures are related to the attenuation coefficients . Among pearlite plus ferrite , quenched martensite , and tempered martensite , α of pearlite plus ferrite is the biggest , α of tempered martensite is the smallest .

用电子衍衬技术研究了低碳回火马氏体在拉压对称疲劳过程中碳化物的变化及基体位错结构的回复，根据能量最小原理分析了碳化物与位错的交互作用。

The change in carbides and the recovery of dislocation structure in the matrix of tempered martensite during the process of fatigue have been studied with the help of a TEM . According to the principle of minimum energy , the interaction between carbides and dislocation was analyzed .

这两种分别被称为奥氏体回火和马氏体回火的工艺，能使产品具有特定所需的物理性能。

These processes , known as austempering and martempering , result in products having certain desirable physical properties .

这种短小的回火板条马氏体相对具有较低的疲劳缺口敏感性并可使屈服强度和伸长率同时提高。

This structure is of lower sensitivity to notch fatigue and makes the yield strength as well as elongation increase .

430℃回火，马氏体分解形成大量的渗碳体，合金的韧性最差。

Upon tempering at 430 ℃, the martensite decomposed to forma lot of cementite platelets concomitant with a significant drop in toughness .

显微组织为回火板条马氏体+下贝氏体+残余奥氏体+弥散碳化物，该组织是耐磨钢与破碎机原衬板相比较，机械性能提高的主要原因。

The Microstructure is tempered martensite + bainite + retained austenite + carbide dispersion . The microstructure is the main reason of the good comprehensive mechanical properties .

结果表明，经低温回火，马氏体－贝氏体复相组织中含15%～25%下贝氏体时，钢的强韧性及模具使用寿命显著提高。

The result shows that in case of bainite content of ( M + B ) duel phase structure was about 15 % ~ 25 % the strengthening and toughening and the service life of die is markedly increased .

在反复强力冲击工况条件下，回火得到回火马氏体，抗冲击剥落能力大为增加。

Tempering treatment resulted in formation of tempered martensite and the spalling resistance under repeated strong impact abrasion working conditions was largely improved .

高温回火后，马氏体的分解软化以及铁素体中位错密度减小是导致双相钢性能恶化的主要原因。

The decomposition of martensite and decrease of dislocation density in ferrite are the main reasons of deteriorating the mechanical properties of dual phase steel .

高温预回火可以退化马氏体、贝氏体的片（针）状形态，增加回火组织的分散度，从而推迟了片状奥氏体的形成。

Prior high-temperature temper can transform the morphology of lath martensite and needled bainite and promote dispersion of tempered structure , which is good for postponing formation of flake austenitic .