1Cr12Ni3Mo2VN耐热钢淬火工艺研究
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摘要
利用金相显微镜、扫描电镜和透射电镜等研究了1Cr12Ni3Mo2VN耐热钢的淬火工艺对组织的影响。结果表明,淬火温度1 030℃以上时,奥氏体晶粒显著长大,淬火后获得粗大的马氏体,抗拉强度和冲击韧度都显著降低;残余奥氏体发生热失稳分解是引起试验钢淬火缓冷后冲击韧度显著降低的主要原因。最佳淬火工艺为(1 010~1 030℃)×1 h油冷,试样具有优良的综合力学性能。
The quenching technology of 1Cr12Ni3Mo2 VN heat-resistant steel was investigated by metalloscopy and SEM and TEM. The results show that quenching temperature is above 1 030 ℃, the austenitic grain size will grow up significantly, and the matrix will get a thick martensite after quenching, and the tensile strength and impact toughness are significantly reduced; The thermal instability decomposition is the main reason to decrease the impact toughness after quenching and slow cooling. The best quenching process is 1 010~1 030 ℃ for 1 h and with oil cooling, the samples have excellent comprehensive mechanical properties.
The quenching technology of 1Cr12Ni3Mo2 VN heat-resistant steel was investigated by metalloscopy and SEM and TEM. The results show that quenching temperature is above 1 030 ℃, the austenitic grain size will grow up significantly, and the matrix will get a thick martensite after quenching, and the tensile strength and impact toughness are significantly reduced; The thermal instability decomposition is the main reason to decrease the impact toughness after quenching and slow cooling. The best quenching process is 1 010~1 030 ℃ for 1 h and with oil cooling, the samples have excellent comprehensive mechanical properties.
引文
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[3]崔忠圻,覃耀春.金属学与热处理.第2版[M].北京:机械工业出版社,2007.
[4]王立民,邰青安,杨钢,等.冷却速率对OCr 11 Ni2MoVNb钢冲击韧度和组织的影响[J].机械工程材料,2006,30(8):31-33.
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