带状组织对S355J2W(H)耐候钢板冲击性能的影响  

Influence of Banded Structure on Impact Toughness of S355J2W(H) Weathering Steel Plate

作　　者：李春来 潘雪新[2] 郭继祥 曾令会 姜海昌[2] 王宏图 郭永硕 胡小峰[2] 付鸿[2] LI Chunlai;PAN Xuexin;GUO Jixiang;ZENG Linghui;JIANG Haichang;WANG Hongtu;GUO Yongshuo;HU Xiaofeng;FU Hong(Crrc Tangshan Co.,Ltd.,Tangshan 064099,China;Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;Chengdu Metro Operation Co.,Ltd.,Chengdu 610000,China)

机构地区：[1]中车唐山机车车辆有限公司转向架技术中心,河北唐山064099 [2]中国科学院金属研究所,辽宁沈阳110016 [3]成都地铁运营有限公司,四川成都610000

出　　处：《热加工工艺》2021年第6期46-49,共4页Hot Working Technology

基　　金：国家重点研发计划资助项目(2017YFB1201302)。

摘　　要：通过金相显微镜和扫描电镜对具有不同带状组织等级的S355J2W(H)耐候钢板的显微组织进行观察;测试了不同温度下该钢的冲击性能和拉伸性能。结果表明:带状组织对S355J2W(H)耐候钢板拉的冲击性能影响较大。带状组织严重的板材横向冲击性能比板材的纵向冲击功降低150 J左右,尤其是低温冲击韧性明显降低。其主要原因在于带状组织内珠光体局部应力集中而萌生裂纹,在受力情况下裂纹沿珠光体和铁素体界面扩展并开裂。The microstructure of S355J2W(H) weathering steel sheet with different band microstructure grades was observed by OM and SEM. The impact properties and tensile properties of S355J2W(H) weathering steel at different temperatures were tested. The results show that the band structure has great influences on the impact properties of the S355J2W(H) steel sheets. The transverse impact toughness of the steel sheet is 150 J lower than that of the longitudinal toughness, especially the low temperature impact toughness significantly reduces. The main reason is that the local stress concentration of pearlite in the banded structure results in the initiation of cracks and the crack propagates and fractures along the interface between pearlite and ferrite under the stress.

关 键 词：带状组织 冲击性能 S355J2W(H)耐候钢 微观组织 

分 类 号：TG142.1[一般工业技术—材料科学与工程]