| 微量Zr添加对Mn-Mo-Nb-Cu-B钢晶粒长大倾向性的影响 |
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| 引用本文： | 郭佳,尚成嘉,郭爱民,郭晖,杨善武,贺信莱.微量Zr添加对Mn-Mo-Nb-Cu-B钢晶粒长大倾向性的影响[J].北京科技大学学报,2008,30(11). |
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| 作者姓名： | 郭佳 尚成嘉 郭爱民 郭晖 杨善武 贺信莱 |
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| 作者单位： | 1. 北京科技大学材料科学与工程学院,北京,100083
2. 北京科技大学材料科学与工程学院,北京,100083;武汉钢铁(集团)公司技术中心,武汉,430080 |
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| 基金项目： | 国家高技术研究发展计划(863计划)
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| 摘 要： | 设计了一种低碳Mn-Mo-Nb-Cu-Zr-B钢,经热处理工艺,采用中等冷速冷却,可得到以板条贝氏体为主,含粒状贝氏体和针状铁素体的混合组织,轧态屈服强度大于850MPa,达到X120管线钢的强度要求. TEM观察表明,0.015% Zr(质量分数)添加到钢中形成大量含Zr的复杂的碳氮化物,它们的形状不规则,尺寸约为80～200nm;从形态看,它们在高温形成,并且由于其熔点高,再加热到1200℃时,这种析出物中的Ti、Nb会有部分溶解,使其尺寸有所减小,利于控制奥氏体晶粒长大;其他近椭球形的(Ti,Nb)(C,N)则在加热时逐渐溶解直至消失. 由于这种含Zr析出物在钢的基体中均匀分布,加热到高温时,它们会明显阻碍晶界移动,从而使含Zr钢的奥氏体晶粒长大倾向性明显比不含Zr钢小. 可见,添加微量Zr能够起到提高钢材焊接性能的作用.
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| 关 键 词： | 低碳贝氏体钢 锆添加 晶粒长大 析出相 |
Effect of micro-zirconium addition on the carbonitride precipitation and austenite grain coarsening in Mn-Mo-Cu-Nb-B structure steel |
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| GUO Jia,SHANG Chengjia,GUO Aimin,GUO Hui,YANG Shanwu,HE Xinlai.Effect of micro-zirconium addition on the carbonitride precipitation and austenite grain coarsening in Mn-Mo-Cu-Nb-B structure steel[J].Journal of University of Science and Technology Beijing,2008,30(11). |
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| Authors: | GUO Jia SHANG Chengjia GUO Aimin GUO Hui YANG Shanwu HE Xinlai |
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| Institution: | GUO Jia1),SHANG Chengjia1),GUO Aimin1,2),GUO Hui1),YANG Shanwu1),HE Xinlai1)1) School of Material Science , Engineering,University of Science , Technology Beijing,Beijing 100083,China 2) Technology Center of Wuhan Iron , Steel (Group) Co.,Wuhan 430080,China |
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| Abstract: | Low carbon Mn-Mo-Nb-Cu-Zr-B steel was designed,which was processed by thermo-mechanical controlling and cooled at medium cooling rate,and the microstructures including an abundant of lath bainite,a number of granular bainite and a bit of acicular ferrite were obtained.The yield strength of the as-rolled steel plate exceeds the 850 MPa grade,which meets the need for the mechanical properties of X120 pipe line steel.As 0.015% Zr (mass faction) was added in the steel,a number of complex Zr-bearing carbonitride... |
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| Keywords: | low carbon bainite steels zirconium addition grain growth precipitates |
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