ISSN:1003-8620

CN:42-1243/TF

主管:中信泰富特钢集团股份有限公司

主办:大冶特殊钢有限公司

特殊钢 ›› 2010, Vol. 31 ›› Issue (1): 57-59.

• 组织和性能 • 上一篇    下一篇

淬火冷却速度对耐热钢lCrl2Ni3Mo2VN组织和性能的影响

谢学林1, 杨钢2, 傅骏1, 王泽忠1, 雍歧龙2   

  1. 1 四川工程职业技术学院材料工程系,德阳618000;
    2钢铁研究总院结构材料研究所,北京100081
  • 收稿日期:2009-07-27 出版日期:2010-02-01 发布日期:2022-10-27
  • 作者简介:谢学林( 1972-),男,硕士,助理工程师,主要从事超(超)临界火电机组汽轮机叶片钢的开发研究。

Effect of Quenching Cooling Rate on Structure and Mechanical Properties of Heat-Resistant Steel lCrl2Ni3Mo2VN

Xie Xuelin1 ,  Yang Gang2,  Fu Jun1 , Wang Zezhong1 , Yong Qilong2   

  1. 1 Dept of Materials Engineering, Sichuan Engineering Vocational Technology College, Deyang 618000;
    2 Institute for Structural Materials, Central Iron and Steel Research Institute, Beijing 100081
  • Received:2009-07-27 Published:2010-02-01 Online:2022-10-27

摘要: 研究了1040℃1h油冷、炉冷(5℃/min)、1℃/min、0.5℃/min冷却后耐热钢1Cr12Ni3Mo2VN的组织和该钢1040℃1h不同冷却速度淬火+565℃2h空冷后的力学性能。试验结果表明,该钢4种冷却速度淬火均可得到马氏体组织,但油冷+回火的AKV2值为156.5 J,而5~0.5℃/min冷却+回火时为40.5~16.5 J。残余奥氏体发生热失稳分解是导致试验钢淬火缓冷后冲击韧性显著下降的主要原因;在淬火缓冷过程中720~820℃这一温度段,由于原奥氏体晶界上碳化物的大量析出,使残余奥氏体中合金元素和碳含量的显著减少,造成淬火组织中的残余奥氏体稳定性大幅度下降。

关键词: 耐热钢1Cr12Ni3Mo2VN, 淬火冷却速度, 组织, 力学性能

Abstract: Structure of heat-resistant steel 1 Crl2Ni3Mo2VN quenched at 1 040 T for 1 h oil cooling, furnace cooling (5 T/min) , 1 °C./min and 0. 5 °C/min cooling and mechanical properties of the steel quenched at 1 040 °C for 1 h with different cooling rate + tempered at 565 °C for 2 h have been studied. Test results show that martensite structure of the steel quenched with four cooling rate is obtained, but AKV2 value of the steel by quenching, oil cooling and tempering is 156. 5 J, while that by quenching, 5 ~0. 5 °C/min cooling and tempering is 40. 5 - 16. 5 J. The thermal decomposition of retained austenite in steel slow-cooled is main reasons for impact energy marked decreasing, i. e. during quenching slow- cooling at 720 ~ 820 °C, a large amount of carbide precipitates at original austenite grain boundary led to obvious decreasing alloying elements and carbon content in residual austenite and poor stability of residual austenite in quenched structure.

Key words: Heat Resistant Steel 1 Crl2Ni3Mo2VN, Quenching Cooling Rate, Structure, Mechanical Properties