加热速率对Cr8Mo2SiV冷作模具钢奥氏体化过程的影响  

Effect of heating rate on austenitization process of Cr8Mo2SiV cold working die steel

作　　者：贺帅[1] 李长生[1] 韩亚辉[1] 任津毅 金鑫[1] 王煜 HE Shuai;LI Chang-sheng;HAN Yan-hui;REN Jin-yi;JIN Xin;WANG Yu(State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang,Liaoning 110819,China)

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室

出　　处：《模具工业》2019年第12期28-31,共4页Die & Mould Industry

基　　金：国家重点研发计划项目（2016YFB0300400）

摘　　要：以高碳中铬的Cr8Mo2SiV莱氏体冷作模具钢为研究对象,采用Formastor-FII相变仪和差示扫描量热仪分析了不同加热速率下退火态钢的奥氏体化过程。结果表明,随着加热速率由2℃/min增大至40℃/min,根据膨胀法逆共析转变的起始和终了温度分别升高了34℃和51℃,逆共析转变温度区间由22℃增大至39℃,奥氏体均匀化温度也随之升高;根据差示法整个加热过程可以分为5个阶段,主要包括碳化物向奥氏体的转变、铁素体向奥氏体的转变以及奥氏体均匀化过程,2种方法分析得到的各临界温度点的值基本一致,试验结果可为冷作模具钢的工业化生产提供理论依据。Taking Cr8Mo2SiV ledeburite cold working die steel with high carbon and medium chromium as the research object, the austenization process of this kind of annealed die steel under different heating rates was analyzed by Formastor-FII phase transformation instrument and differential scanning calorimeter. The results showed that the initial and final temperatures of the reverse eutectoid transformation increased by 34 ℃ and 51 ℃ based on the thermal expansion method, respectively, with the increase in heating rate from 2 ℃/min to 40 ℃/min. The temperature ranges of this transformation increased from 22 ℃ to39 ℃, and the homogenized temperature of austenite increased. According to differential scanning calorimetry, the whole heating process could be divided into five stages including the transformation of carbides to austenite, the transformation of ferrite to austenite and the process of austenite homogenization. The critical temperature points obtained by the two methods were basically the same, and the results could provide a theoretical basis for the industrial production of cold working die steel.

关 键 词：冷作模具钢 奥氏体化 加热速率 碳化物 

分 类 号：TG162.4[金属学及工艺—热处理]