摘要
进行了V、Ti元素含量不同的耐候钢的过冷奥氏体连续冷却转变热模拟试验并绘制了CCT曲线,研究了不同冷却速度以及V、Ti元素对耐候钢组织转变以及性能的影响。当V含量由0.03%提高至0.07%,马氏体转变开始温度Ms提高25℃,促进了马氏体相变。当Ti含量由0.03%提高至0.10%,扩大了贝氏体相变区、降低了贝氏体开始转变冷速,促进了贝氏体转变;同时,马氏体转变开始温度Ms降低22℃、马氏体转变终了温度Mf升高18℃,马氏体转变区域变窄,抑制了马氏体转变。随着冷却速率的提高,HV0.2硬度值逐渐增加。HV0.2硬度值主要受金相组织的尺寸和形貌影响,V、Ti的第二相析出物对HV0.2硬度值的影响不大。
Continuous cooling transformation thermal simulation experiment of weathering steel with various V or Ti contents was conducted, and effects of cooling rate and V or Ti element on microstructure transformation and property of weathering steel were investigated. When V content increases from0.03% to 0.07%, the martensite-start temperature increases 25 ℃, thereby promoting martensitic phase transformation. When Ti content increases from 0.03% to 0.10%, the bainitic phase transformation region expands, and the cooling rate with which bainite transformation starts decreases, thereby promoting bainitic phase transformation;meanwhile, martensite-start temperature decreases 22 ℃, and martensite-finish temperature increases 18 ℃, inducing martensitic phase transformation region shrinks,thereby restraining martensitic phase transformation. With the cooling rate increasing, HV0.2 hardness increases. HV0.2 hardness is mainly affected by the size and morphology of metallographic structure but fewer affected by second phase precipitates of V or Ti.
作者
崔凯禹
李正荣
赵征志
叶晓瑜
汪创伟
张开华
胡云凤
熊雪刚
Cui Kaiyu;Li Zhengrong;Zhao Zhengzhi;Ye Xiaoyu;Wang Chuangwei;Zhang Kaihua;Hu Yunfeng;Xiong Xuegang(State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization,Panzhihua 617000,Sichuan,China;School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150000,Heilongjiang,China;Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Beijing 100000,China)
出处
《钢铁钒钛》
CAS
北大核心
2022年第3期132-138,共7页
Iron Steel Vanadium Titanium
关键词
耐候钢
CCT曲线
钒
钛
贝氏体
马氏体
硬度
weathering steel
CCT curve
vanadium
titanium
bainite
martensite
hardness
