热处理对3Cr14Mn4B高铬铸铁硬化行为的影响  

Effects of Heat Treatment on Hardening Behavior of 3Cr14Mn4B High Chromium Cast Iron

作　　者：易勇[1] 王院生[2] 范洪远[2] 熊计[2] 王均[2] 

机构地区：[1]西南科技大学材料科学与工程学院 [2]四川大学制造科学与工程学院

出　　处：《特种铸造及有色合金》2011年第8期699-702,共4页Special Casting & Nonferrous Alloys

基　　金：先进建筑材料四川省重点实验室(西南科技大学)开放基金资助项目(09zxxk11)

摘　　要：通过对高铬铸铁3Cr14Mn4B的硬度和磁性的测量,研究了高铬铸铁经亚临界处理、去稳处理及深冷处理后的组织和硬度变化,分析了高铬铸铁残余奥氏体和马氏体的相组成对高铬铸铁硬度的影响。结果表明,高铬铸铁的显微组织主要由马氏体、少量的奥氏体和(Cr,Fe)7C3共晶碳化物组成。在亚临界处理的情况下,空冷时高铬铸铁的硬度随亚临界处理温度的增加而先升高后降低,深冷处理后的硬度高于空冷时的,但当温度高于550℃时,深冷处理后的硬度低于空冷时的。高铬铸铁的硬度随去稳处理温度的升高略有升高,并且经深冷处理后的试样硬度比空冷高。经不同的热处理后,高铬铸铁的硬度主要受铸铁基体的马氏体含量和马氏体中的含碳量的影响。最佳的热处理工艺是在550℃进行亚临界处理。Through measuring hardness and magnetic behavior of high chromium cast iron（3Cr14Mn4B）,microstructure and hardness change of the cast iron after sub-critical,destabilized and cryogenic treatment were examined to understand the effects of retained austenite and martensite on hardness of the cast iron.The results show that the microstructure of the high chromium cast iron is composed of martensite,a small amount of austenite and（Cr,Fe）7C3 eutectic carbide.In the condition of sub-critical treatment,the hardness of the cast iron is firstly increased and then decreased with increasing in sub-critical treating temperature at air cooling,which is lower than that of one at cryogenic treatment,however,it is higher than that at cryogenic treatment with sub-critical temperature more than 550 ℃.The hardness of the cast iron is slightly increased with destabilized temperature increase,which is higher at cryogenic treatment than that at air cooling.After different heat treatment,hardness of the high chromium cast iron is controlled by martensite content in cast iron matrix and carbide content in martensite phase.The optimized heat treatment process is sub-critical treatment at 550 ℃.

关 键 词：高铬铸铁 亚临界处理 去稳处理 深冷处理 硬化行为 

分 类 号：TG163[金属学及工艺—热处理]