铬含量对中碳锰铬钢珠光体相变组织和性能的影响  

Effect of chromium content on pearlite transformation microstructure and properties of medium carbon Mn- Cr steels

作　　者：闵永安[1] 邓传印 张铮[1] 吴晓春[1] 

机构地区：[1]上海大学材料科学与工程学院,上海200072

出　　处：《材料热处理学报》2014年第2期86-93,共8页Transactions of Materials and Heat Treatment

基　　金：国家"十一五"科技支撑计划(2007BAE51B04);上海市重点学科建设项目(S30107)

摘　　要：采用热膨胀仪测定了含Cr量分别为1 mass%和2.5 mass%的中碳锰铬钢55Mn2Cr、55Mn2Cr3的过冷奥氏体连续转变曲线,结合组织观察、硬度测定、动力学分析、热力学计算等研究了Cr元素含量对中碳锰铬钢珠光体相变过程、组织和硬度的影响。研究表明,55Mn2Cr3钢较高的淬透性和较大珠光体球化倾向缩小了其片状珠光体转变区;55Mn2Cr钢能在较宽冷速范围内、较低温度下获得细片珠光体,硬度330 HV左右。Continuous cooling transformation （CCT） curves of two medium carbon Mn-Cr steels, 55Mn2Cr and 55Mn2Cr3, with Cr content of 1 mass% and 2.5 mass% respectively, were tested by dilatometer. Based on the curves, the effect of Cr content on pearlite transformation, microstrueture and hardness of the Mn-Cr steels were studied by means of OM, SEM, hardness test, kinetic analysis and thermodynamic calculation. The results show that 55Mn2Cr3 steel has smaller transformation zone of lamellar pearlite, due to its higher hardenability and higher spheroidizing tendency during pearlite transformation ; while 55Mn2Cr steel has larger pearlite transformation zone and can display fine lamellar pearlite with hardness about 330 HV due to its lower pearlite transformation temperature.

关 键 词：非调质钢 相变 珠光体 节能 

分 类 号：TG142.21[一般工业技术—材料科学与工程]