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30CrMnSiA钢经1200℃加热淬火获得粗大的奥氏体晶粒，再于650℃保温后缓冷或500℃等温时，冲击韧性值降低．经不同程度脆化后再进行脱脆处理，冲击韧性将全部恢复，除脆化处理冲击试样的宏观和微观断口形貌分别为结晶状和沿晶外，韧化处理和脱脆处理的宏观断口上也存在有少量的与微口断口上为沿晶断口相对应的萘状断口．并且不论何种处理的冲击试样，当断口上出现沿晶断裂区时，其沿晶面上均存在有大量的质点和小孔洞．作者认为，高温回火脆性主要因置换型团溶杂质原子（P、Sb、Sn、As等）与间隙型固溶原子（C、N）一起在位错线上形成柯氏气团使晶内强化晶界相对弱化所致．
30CrMnSiA steel after quenching at 1200 ℃ to obtain coarse austenite grains, and then slow cooling at 650 ℃ or 500 ℃ isothermal, the impact toughness value decreases. After embrittlement treatment to varying degrees, the impact toughness will be fully recovered. The macroscopic and microscopic fracture appearances of the specimens subjected to the embrittlement treatment are the macroscopical There are also a few fracture on the micro-mouth fracture along the crystalline fracture corresponding to the naphthalene fracture. And no matter what kind of impact test specimen, when the fracture along the crystal fracture zone, there are a large number of particle along the crystal plane and small holes. The author believes that the high temperature temper brittleness is mainly due to replacement of cluster-like impurity atoms (P, Sb, Sn, As, etc.) and interstitial solid solution atoms (C, N) Grain boundary is relatively weakening.