快速加热连续退火对超高强TRIP钢显微组织与力学性能的影响
EFFECTS OF RAPID HEATING CONTINUOUS ANNEAL ING ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF ULTRA HIGH-STRENGTH TRIP-AIDED STEEL
查看参考文献19篇
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文摘
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研究了快速加热连续退火工艺对V微合金化低Si含P系TRIP钢显微组织特征与力学性能的影响。结果表明,快速连续退火过程中,随着退火温度的升高,拉伸强度增加明显,然而为了保证其综合性能,并不能一味地提高其临界退火温度。加热速率80℃/s,退火温度为880℃时,残余奥氏体形态不仅仅局限于细小的块状结构;而且在贝氏体铁素体板条间能观察到大量的薄膜状残余奥氏体。细小、弥散的V(C,N))分布于铁素体或贝氏体基体中,大部分析出粒子直径在4—9 nm之间,实验钢具有优异的强度与塑性配合:Rm=1010 MPa,R_(P0.2)=690 MPa,δ=23。6%,n=0.27,r=1.17,强塑积达到23836 MPa。%。退火温度过高或过低,都会减少残余奥氏体的体积分数、改变其形貌并增大其尺寸,导致综合力学性能下降。 |
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其他语种文摘
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The effects of rapid heating continuous annealing on microstructure and mechanical properties of ultra-high strength and low silicon TRIP steel containing phosphorus and vanadium were investigated.The results show that the yield and tensile strengths are increased with increasing inter- critical annealing temperature during rapid continuous annealing.However,the intercritical annealing temperature can not increase blindly to ensure its excellent combined mechanical properties.When the heating rate is 80°C/s and intercritical annealing temperature is 880°C,the retained austenite not only contains fine blocky structure,but also a large amount of interlath retained austenite films. A great amount of V(C,N) precipitates exists within ferritic matrix,and the sizes of most of the precipates are in the range from 4 to 9 nm.The tested steel has excellent mechanical properties:R_m = 1010 MPa,-R_(p0.2)=690 MPa,(5=23.6%,n=0.27,r=1.17,the product of strength and ductility(R_m xδ) is 23836 MPa-%.If the intercritical annealing temperature is too high or too low,the comprehensive mechanical properties will be deteriorated since the volume fraction of retained austenite reduces, morphology changes and its size increase. |
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来源
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金属学报
,2012,48(2):176-182 【核心库】
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DOI
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10.3724/sp.j.1037.2011.00476
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关键词
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含V TRIP钢
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快速加热
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连续退火
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力学性能
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残余奥氏体
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地址
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1.
东北大学, 轧制技术及连轧自动化国家重点实验室, 沈阳, 110819
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莱芜钢铁集团有限公司, 莱芜, 271104
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0412-1961 |
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学科
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金属学与金属工艺 |
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基金
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国家自然科学基金
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国家973计划
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中央高校基本科研业务费专项资金
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文献收藏号
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CSCD:4521951
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