14Cr-1Mo-1.5V高铬白口铸铁的深冷硬化机理  

Hardening Mechanism for 14Cr-1Mo-1.5V Cast Iron Subjected to Cryogenic Treatment

作　　者：王均[1] 曾明[1] 杨宏山[1] 沈保罗[1] 刘浩怀[1] 高升吉[1] 黄四九 

机构地区：[1]四川大学材料科学与工程学院,四川成都610064 [2]四久稀土合金铸造厂,四川成都610211

出　　处：《钢铁研究学报》2007年第4期90-94,共5页Journal of Iron and Steel Research

摘　　要：采用X射线衍射、磁性法和硬度测量等方法研究了深冷处理对高铬白口铸铁显微组织和硬化行为的影响。结果表明,去稳+深冷处理铸铁的硬度比未深冷处理铸铁明显提高,从HRC 64.1提高到HRC 67.0。这是因为深冷处理使高铬白口铸铁的残余奥氏体量大大下降,马氏体的大量形成和细微二次碳化物的析出强化作用显著提高了高铬白口铸铁的硬度。深冷处理后铸铁组织中仍存在少量残余奥氏体。The effects of cryogenic treatment on the microstructure and the hardening behavior for high chromium cast iron were investigated by X-ray diffraction, magnetic method and hardness test. The results show that after cryogenic treatment, the sample bulk hardness has a great increase, from HRC 64. 1 for air-cooling treatment to HRC 67.0 for cryogenic treatment after holding half an hour at 1 000 ℃. The analysis of microstructure reveals that the retained austenite content of sample after cryogenics treatment decreases greatly and much fine secondary carbide precipitates from matrix. Martensite transformation and the secondary carbide precipitation are the cause of bulk hardness increase. The matrix has few retained austenites even after cryogenic treatment.

关 键 词：高铬白口铸铁 深冷处理 二次碳化物析出 马氏体相变 

分 类 号：TG156.91[金属学及工艺—热处理]