热轧+自回火工艺对P20塑料模具钢组织和性能的影响  

Effect of Hot Rolling and Self-tempering Process on Microstructure and Properties of P20 Plastic Die Steel

作　　者：王明娣 WANG Mingdi(Fujian Sanming Iron&Steel Group,Sanming 365000,China)

机构地区：[1]福建省三钢(集团)有限责任公司,福建三明365000

出　　处：《金属材料与冶金工程》2020年第2期32-36,41,共6页Metal Materials and Metallurgy Engineering

摘　　要：目前针对P20塑料模具钢的热处理工艺是正火+回火,由于此工艺生产时间较长,因此如何缩短工艺流程、降低能源消耗成为研究方向。本文中采用热膨胀仪、洛氏硬度仪、光学显微镜(OM)以及场发射扫描电镜(SEM)等设备研究了热轧+自回火工艺对于P20塑料模具钢组织及性能的影响。热模拟结果表明:实验钢500℃以下开始发生贝氏体转变,相变鼻尖温度约为430℃。轧制实验表明:在300~500℃的自回火过程中,试样的硬度值随自回火温度的升高而降低,不同位置的硬度波动范围为2HRC。The current heat treatment for P20 plastic die steel is normalizing and tempering however this process takes long time.Thus how to shorten the process and reduce energy consumption arouses research interests.This paper adopted thermal dilatometer,Rockwell hardness tester,optical microscope(OM)and field emission scanning electron microscope(SEM)to analyze the effect of hot rolling and self-tempering process on microstructure and properties of P20 plastic die steel.Results of the thermal simulation indicate that bainite transformation begins below 500℃and bainite temperature of the nasal tip is about 430℃.And rolling experiment shows that hardness of the sample decreases with the increase of the self-tempering temperature from 300℃to 500℃,and the hardness fluctuation range of different positions is 2 HRC.

关 键 词：P20塑料模具钢 热轧工艺 自回火 

分 类 号：TG335[金属学及工艺—金属压力加工]