加热温度对高钒高速钢中M2C碳化物分解转变行为的影响
Effect of Heating Temperature on Decomposition Transition Behavior of M2C Carbide in High-vanadium High-speed Steel
曹玉龙 1张赛康 2汪秀秀 3马崇圣 2李光强1
作者信息
- 1. 武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,武汉 430081;武汉科技大学省部共建耐火材料与冶金国家重点实验室,武汉 430081
- 2. 武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,武汉 430081
- 3. 东风商用车有限公司技术中心,武汉 430056
- 折叠
摘要
基于高耐磨性的需要,设计了一种W3Mo4Cr5V6高钒高速钢,利用SEM、EMPA等手段对该钢高温加热过程亚稳态M2C碳化物的分解转变行为进行了分析.结果表明,共晶碳化物M2C在高温加热过程会发生M2C+γ-Fe→M6C+MC+M7C3的转变,在富Mo、W的M2C相周围形成了大量富W、Mo的M6C及少量富V的MC和富Cr的M7C3.随着温度由950℃增至1 150℃,M2C高温转变逐渐趋于完全,且纤维状M2C比层片状M2C更易分解转变,最终,由呈断续网状分布于奥氏体晶界的层片或纤维状形貌向零星分布于晶界的颗粒状形貌过渡,可有效减少网状碳化物对晶界的危害.研究可为高速钢中晶界碳化物成分、形态控制及其热加工、热处理过程温度与时间等参数选择提供有效参考.
Abstract
Based on the need of high wear resistance,a new kind of high-vanadium high-speed steel named W3Mo4Cr5V6 was designed.The transformation behavior of metastable M2C carbides in the high temperature heating process of the steel was analyzed by means of SEM and EMPA.The results show that the cophortic M2C carbide will undergo M2C+γ-Fe→M6C+MC+M7C3 transition at high temperature heating process.A large number of W,Mo-rich M6C and a small amount of V-rich MC and Cr-rich M7C3 are formed around the Mo and W-rich M2C phase.With the increase of temperature from 950℃to 1 150℃,the high temperature transformation of M2C carbides gradually tends to be complete and the fibrous M2C is easier to decompose and transform than lamellar M2C,and the lamellar or fibrous morphology distributed in the aus-tenite grain boundary with discontinuous network is transformed into the granular morphology distributed at the grain boundary,which can effectively reduce the harm of network carbides to the grain boundary.The research can provide an effective reference for the composition and morphology control of carbides distributed at the grain boundaries of high-speed steel and the optimal selection of parameters such as temperature and time of hot processing and heat treatment process.
关键词
高速钢/电渣重熔/M2C碳化物/高温转变/成分分析Key words
High-speed Steel/Electroslag Remelting/M2C Carbide/High Temperature Transition/Component Analysis引用本文复制引用
基金项目
湖北省自然科学基金资助项目(2023AFB654)
钢铁冶金及资源利用省部共建教育部重点实验室拔尖人才培育项目(FMRU-lab202306)
出版年
2024
NETL
NSTL
万方数据