回火索氏体(tempered sorbite)是马氏体于高温回火（500℃—600℃）时形成的，在光学金相显微镜下放大500~600倍以上才能分辨出来，其为基体铁素体内分布着碳化物（包括渗碳体）球粒的复合组织。
回火索氏体(tempered martensite)：将淬火钢在450-600℃进行回火，所得到的索氏体称为回火索氏体，是指马氏体在500~650℃..
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It is also found that the high-temperature wear resistance of tempered troostite is superior to tempered martensite and tempered sorbite.
回火屈氏体具有较好的高温磨损性能,回火马氏体和回火索氏体的磨损性相对较差。
参考来源 - 3Cr2W8V热作模具钢高温磨损行为的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
结果表明：回火索氏体是最佳的组织形态；微观硬度的不均匀性显著影响钢的表面加工质量。
The results indicated that the tempered sorbite was the optimum microstructure, the inhomogeneous distribution of micro hardness affected markedly the finish quality of the steel surface.
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).
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