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本文运用系列冲击试验法研究了临界区热处理对抑制Cr17Ni2钢高温回火脆性的效果。试验结果表明,Cr17Ni2钢在550℃回火后,延性一脆性转变温度上升。扫描电镜观察发现,随试验温度升高,常规热处理的冲击断口形貌由沿晶断裂变为韧窝型断裂,临界区处理试件由准解理断裂变为韧窝型断裂。俄歇电子谱仪分析结果表明,Cr17Ni2钢经常规处理后钢中磷、铬、镍在原奥氏体晶界偏聚显著。Cr17Ni2钢虽属含铬、镍较多的高合金钢,但本试验表明,临界区热处理可有效地抑制其高温回火脆性。
In this paper, a series of impact tests were used to study the effect of critical zone heat treatment on the suppression of high temperature temper brittleness of Cr17Ni2 steel. The experimental results show that the ductile-brittle transition temperature of Cr17Ni2 steel increases after tempering at 550 ℃. Scanning electron microscopy observations showed that with the increase of the test temperature, the impact fracture morphology of conventional heat treatment changed from intergranular fracture to dimple fracture, and the specimen in critical region changed from quasi-cleavage fracture to dimple fracture. Auger electron spectroscopy analysis results show that, Cr17Ni2 steel after conventional treatment of steel phosphorus, chromium, nickel in the former austenite grain boundary segregation significantly. Although Cr17Ni2 steel contains chromium and nickel more high-alloy steel, this experiment shows that the critical zone heat treatment can effectively suppress the high temperature temper brittleness.