摘要
采用热模拟试验机、冲击试验机、金相显微镜和扫描电镜等方法,研究了线能量200、300、400 J/cm对船板钢粗晶热影响区组织、晶粒尺寸、夹杂物和低温冲击韧性的影响。结果表明:随着线能量的提高,船板钢的晶内针状铁素体减少,晶界铁素体、脆性侧板条铁素体组织增加,组织粗化;晶粒尺寸粗化,焊接粗晶热影响区低温冲击韧性下降。夹杂物统计分析显示船板钢夹杂物尺寸在3μm以下最多,占62%。扫描电子显微镜显示钛钙、钛铝镁、锆铝钙的氧化物复合夹杂在奥氏体晶内析出,从而促进晶内针状铁素体生成。
The effect of different heat input such as 200 J/cm, 300 J/cm and 400 J/cm on microstructure, grain size and low-temperature impact toughness of welding coarse grained heat affected zone( CGHAZ) for the ship plate steel was studied by thermo-mechanical simulator,impact tester, metallographic examination and scanning electron microscope. The results show that intragranular acicular ferrite decreases, grain boundary ferrite and brittle side lath ferrite increase, microstructure and grain size of welding CGHAZ are coarsened, low-temperature impact toughness of welding CGHAZ decrease with the increase of heat input. Statistical distribution of inclusions shows that the most of the inclusions in the steels are less than 3 μm,which occupies 62%. SEM shows that Ti-Ca, Ti-Al-Mg and Zr-Al-Ca composite oxide inclusions precipitate in austenite grain boundary, which induces intragranular ferrite.
作者
常开地
初仁生
孟振生
张清水
任群
来萍
CHANG Kaidi;CHU Rensheng;MENG Zhensheng;ZHANG Qingshui;REN Qun;LAI Ping(Shougang Research Institute of Technology,Beijing 100043,China)
出处
《金属材料与冶金工程》
CAS
2021年第6期53-57,共5页
Metal Materials and Metallurgy Engineering
