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采用Gleeble 3500热模拟实验机研究了G20Cr Ni2Mo A轴承钢在连续冷却过程中的相变规律,结合膨胀曲线绘制出G20Cr Ni2Mo A钢连续冷却转变曲线,并对不同冷速下显微组织和维氏硬度进行分析。结果表明:在低速冷却时,在两相区先发生铁素体相变,随着冷速的增加,铁素体逐渐减少,基体内残留奥氏体增多,珠光体相变温度区间为600~700℃,贝氏体相变区间主要集中在400~600℃,马氏体转变温度为412℃,当冷速在0.5~5℃/s时,室温下获得贝氏体组织,当冷速大于10℃/s时室温下将获得马氏体组织。
The phase transformation of G20Cr Ni2Mo A bearing steel during continuous cooling was studied by Gleeble 3500 thermal simulation machine. The continuous cooling transformation curve of G20Cr Ni2Mo A steel was plotted with the expansion curve. The microstructure and Vickers Hardness analysis. The results show that the ferrite transformation takes place first in the two-phase zone at low speed, and the ferrite decreases gradually with the increase of cooling rate. The retained austenite increases in the matrix, the temperature range of pearlite transformation is 600 ~ At 700 ℃, the bainite transformation range mainly lies in the range of 400-600 ℃ and the martensite transformation temperature is 412 ℃. When the cooling rate is in the range of 0.5-5 ℃ / s, bainite structure is obtained at room temperature. When the cooling rate is more than Martensite will be obtained at room temperature at 10 ° C / s.