贝氏体基高硅高钒高速钢等温淬火制备及组织特点  

Austempering preparation of high silicon high vanadium high speed steel with bainite matrix and its microstructure characteristics

作　　者：张志勇 石如星 殷立涛 庞庆海 冷婉晴 徐流杰[4] Zhang Zhiyong;Shi Ruxing;Yin Litao;Pang Qinghai;Leng Wanqing;Xu Liujie(CITIC Heavy Industries Co.,Ltd.,Luoyang Henan 471039,China;Luoyang CITIC HIC Casting&Forging Co.,Ltd.,Luoyang Henan 471039,China;State Key Laboratory of Intelligent Mining Heavy Equipment,Luoyang Henan 471039,China;National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials,Henan University of Science and Technology,Luoyang Henan 471003,China)

机构地区：[1]中信重工机械股份有限公司,河南洛阳471039 [2]洛阳中重铸锻有限责任公司,河南洛阳471039 [3]智能矿山重型装备全国重点实验室,河南洛阳471039 [4]河南科技大学金属材料磨损控制与成型技术国家地方联合工程研究中心,河南洛阳471003

出　　处：《金属热处理》2023年第8期87-93,共7页Heat Treatment of Metals

基　　金：河南省重大科技专项(221100230200)。

摘　　要：采用砂型铸造方法制备高硅高钒高速钢,研究等温淬火温度对高硅高钒高速钢纳米贝氏体组织转变的影响。结果表明,通过提高硅含量至2.14%(质量分数),可以抑制贝氏体铁素体中渗碳体的析出,获得纳米贝氏体基体组织。贝氏体组织随等温淬火温度降低得到细化。等温淬火温度从300℃降低到250℃,贝氏体铁素体平均厚度降低30%,薄膜状残留奥氏体平均厚度降低27%,而从250℃到200℃,组织厚度则没有下降。随等温淬火温度降低,贝氏体转化量升高,贝氏体转变时间延长。等温淬火温度由300℃降低至250、200℃,残留奥氏体含量分别降低了34.7%、60.9%,贝氏体转变时间由300℃的84 h延长至200℃的96 h以上。After preparation by sand casting,the effect of austempering temperature on microstructure transformation of nano-bainite in a high silicon and high vanadium high speed steel was studied.The results show that by increasing the silicon content to 2.14%(mass fraction),the precipitation of cementite in bainitic ferrite can be inhibited,and the nano-bainite matrix structure can be obtained.With the decrease of austempering temperature,the bainite structure is refined.When the austempering temperature is decreased from 300℃to 250℃,the average thickness of bainitic ferrite and thin film retained austenite decreases by 30%and 27%,respectively.While from 250℃to 200℃,the microstructure thicknesses do not decrease.The bainite transformation amount increases and the transformation time is prolonged with the decrease of austempering temperature.The content of retained austenite decreases by 34.7%and 60.9%,respectively,when the austempering temperature decreases from 300℃to 250℃and 200℃,and the bainite transformation time increases from 84 h at 300℃to more than 96 h at 200℃.

关 键 词：高钒高速钢 高硅 等温淬火温度 纳米贝氏体 

分 类 号：TG113.1[金属学及工艺—物理冶金]