| 引用本文: | 王小鹏,杜林秀,周民,杨星.800MPa级冷轧耐候双相钢连续冷却相变及组织性能研究[J].材料科学与工艺,2013,21(1):67-72.DOI:10.11951/j.issn.1005-0299.20130112. |
| WANG Xiao-peng,DU Lin-xiu,ZHOU Min,YANG Xing.Microstructure and mechanical properties of 800MPa grade cold rolled weathering dual-phase steel and its continuous cooling phase transformation[J].Materials Science and Technology,2013,21(1):67-72.DOI:10.11951/j.issn.1005-0299.20130112. |
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| 摘要: |
| 为了探索一种800MPa级冷轧耐候双相钢的连续冷却转变规律及退火后组织性能变化,利用Formaster-FⅡ全自动相变仪及连续退火模拟实验机,进行了连续冷却转变(CCT)曲线的测定及连续退火实验.结果表明:实验钢的过冷奥氏体在很低的冷却速度(0.5℃/s)下即可发生马氏体转变,而珠光体转变较少.当冷速为80℃/s时,仅发生马氏体转变；退火后实验钢显微组织中的马氏体呈带状分布,经最优工艺退火后实验钢的显微组织为多边形铁素体(79%)+块状马氏体(16%)+细小的残余奥氏体(5%),残余奥氏体主要分布于马氏体晶粒内部或铁素体的晶界处；实验钢屈服强度为387MPa,抗拉强度为863MPa,延伸率为18%,强塑积达到15534. |
| 关键词: 冷轧耐候钢 组织性能 带状组织 残余奥氏体 |
| DOI：10.11951/j.issn.1005-0299.20130112 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目( 50527402). |
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| Microstructure and mechanical properties of 800MPa grade cold rolled weathering dual-phase steel and its continuous cooling phase transformation |
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WANG Xiao-peng1,DU Lin-xiu1,ZHOU Min2,YANG Xing1
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(1.State Key Laboratory of Rolling& Automation,Northeastern University,Shenyang 110819,China;;2.CISDI Chongqing Iron & Steel making Plant Integration Co,Ltd.,Chongqing 401122,China)
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| Abstract: |
| In the present study,to reveal the continuous cooling transformation,microstructure and mechanical properties changes of a new developed weathering dual-phase steel,continuous cooling experiments and annealing experiments were performed by Formaster-FⅡ automatic expansion instrument and continuous annealing simulator.The results show that martensite transformation occur at very low cooling rates(0.5℃/s),and pearlite amount are seldom.The microstructure only consists of martensite when the cooling rate reaches 80℃/s;It is shown that the test steels have banded martensite structure after annealing.After optimal annealing process,the microstructure is composed of polygonal ferrite(79%)+massive martensite(16%)+fine retained austenite(5%),the retained austenite grains mainly located inside martenite grains or at ferrite boundaries,and the test steels have excellent mechanical properties:Rp0.2=387MPa,Rm= 863MPa,δ=18%,Rm×δ=15534. |
| Key words: cold rolled weathering steel microstructure and mechanical properties banded structure retained austenite |
