回火索氏体

钢筋典型的金相组织（Q235）表层为回火索氏体，过渡层为珠光体+铁素体且部分铁素体呈针状，心部为珠光体+铁素体，晶粒度8～10级；

The typical microstructure ( Q235 ): the surface layer is tempered sorbite ; the transition layer is pearlite and ferrite , and the partial ferrite is acicular ; the core is pearlite and ferrite and the grain fineness is 8 ~ 10 grade .

试验结果得出在600～680℃范围内，Nb能阻止变形马氏体组织的再结晶，时效组织主要为保持板条马氏体位向的回火索氏体，未发现粒状铁素体。

The test results showed that Nb could prevent recrystallization of deformed lath martensite structure at 600 ~ 680 ℃, and the aged structure was tempered sorbite kept lath martensite phase direction with no ferrite particles discovered .

结果表明，混合组织的接触疲劳寿命（No、Nf）高于单一回火索氏体组织。

Ex-perimental results show that contact fatigue life of mixed structure is better than that of single tem-pered sorbite .

用全反向恒应变幅试验方法，研究了C-Mn轨钢珠光体及回火索氏体的应变疲劳行为，探讨了塑性应变在应变疲劳中的作用。

Strain-fatigue properties of pearlite and tempered sorbite in a C-Mn eutectoid rail steel have been studied by fully reversed constant total strain amplitude and plastic strain behavior in strain fatigue process has been investigated .

经热处理后的试样组织均为回火索氏体。

After heat treatment , the microstructure of the steel is tempered sorbite .

回火索氏体钢轨钢循环应变行为与位错结构关系的研究

Relationship between Cyclic Strain Behavior of Tempered Sorbite in a Rail Steel and Its Dislocation Structures

用增量步进试验方法，研究了珠光体和回火索氏体共析轨钢的循环应力-应变行为。

Cyclic stress-strain behavior in pearlitic and tempered sorbitic eutectoid rail steels has been studied by Incremental Step Test technigue .

结果表明，宏观断口为脆性断裂，金相组织不仅有回火索氏体，还包含不应有的带状铁素体、魏氏体组织及明显的枝状晶和非金属夹杂物，从而导致钢的韧性降低。

The results show that the banded ferrite structure , widmanstatten structure , dendritical microstructure and nonmetallic inclusion which decreasing the toughness of the steel cause the brittle fracture .

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 ) .

本文设计旨在既保留回火索氏体组织又能细化晶粒的多次调质热处理工艺，以期使其耐磨性得到提高。

In this paper , repeated quenching and tempering processing was used to not only refine the grain size and but also keep the microstructure as tempered sorbite . Good wear resistance is also desired to be obtained by the processing .

高温回火后组织为回火索氏体。

After high temperature tempering the microstructure transform into tempered Sorbite .

考虑了塑性变形的存在情形，对回火屈氏体和回火索氏体两种材料试样的孔边前方应力应变场进行了弹塑性有限元分析。

In this paper , plastic variation is considered and the stress-strain fields beside the holes are analyzed by means of the elastic and plastic analysis of finite element for two WOL specimens of 40 CrNi steel of troostite and sorbite micro-structures .

结果表明，因中频淬火的不连续，使淬硬层出现了回火软区，组织为回火索氏体，降低了材料的硬度和疲劳极限，最终导致从动齿轮开裂。

The results showed that tempered soft zone in harden zone case produced in process of discontinuous medium frequency induction hardening which has microstructure of tempered sorbite and low hardness and low fatigue limit were major reason to cause driven gear cracking .

认为，根据各种回火组织的特性，船体钢的高温回火组织应归为回火索氏体。

Based on these , according to characteristic of steel tempering structure , high temperature tempering structure of hull steel is called tempered martensite .