Z. Li
金属学报(英文版)
Effect of austempering on the transformation induced plasticity (TRIP) of hot rolled multiphase steel was investigated. Polygonal ferrite, granular bainite, and a large amount of stabilized retained austenite could be obtained in the hot rolled multiphase steel. Strain induced martensite transformation (SIMT) of retained austenite and TRIP effectively occur under straining owing to austempering after hot rolling, and mechanical properties of the present steel remain at a relatively high constant value for austempering at 400℃. The mechanical properties of the steel exhibited a good combination of tensile strength (791MPa) and total elongation (36%) because the stability of retained austenite is optimal when the steel is held for 20min.
关键词:
austempering
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null
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null
HU Guangli LIU Zhengtang WANG Ping HUA Wenjun KANG Mokuang Northwestern Polytechnical University
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Xi'an
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China HU Guangli
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Associate Professor
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Department of Materials Science and Engineering
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Northwestern Polytechnical University
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Xi'an
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China
金属学报(英文版)
The variations of microstructures and mechanical properties of steels 15CrMnMoV, 18Mn2CrMoB,18Cr2Ni4W,30CrMnSi,30CrMnSiNi2 and 40CrMnSiMoV,which were tempered at different temperatures after austempering and continuous cooling at given rates, have been investigated.Based on the experimental results,the behaviour and mechanism of tempered bainite embrittlement(TBE)have been discussed.Finally,the theoretical and prac- tical basis for selecting the optimum tempering temperature of steels with bainite structure af- ter heat treatment are proposed.
关键词:
austempering
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null
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null
王健
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刘金海
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赵雪勃
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李国禄
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彭云成
材料热处理学报
对球墨铸铁等温淬火过程中熔融硝盐结垢的组分及形成机制进行了研究,并提出了预防措施.结果表明,结垢的主要组分是Na2CO3、NaNO3、KNO3、NaNO2和Fe2 O3.其中,Na2CO3的含量为60％,这归因于NaNO2受热分解后生成的Na2O与盐池气氛中的CO2反应而产生的.Fe2 O3是工件表面氧化后氧化皮剥落产生的.用热稳定性较高的NaNO3代替NaNO2,可以提高硝盐整体的热稳定性,减少Na2CO3的生成,对防止硝盐变质起到一定的作用;还防止奥氏体化过程中铸件的氧化.
关键词:
等温淬火
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硝盐
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结垢
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形成机制
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球墨铸铁
艾地
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吴化
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刘云旭
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刘耀东
材料热处理学报
对新型的高碳低合金75Si2Mn1.5CrB钢进行了在200℃等温淬火工艺组织和力学性能的研究.利用激光显微镜、透射电子显微镜(TEM)和X射线衍射仪(XRD)对等温淬火处理的试验用钢进行了观察和分析.结果表明,75Si2Mn1.5CrB钢经920℃奥氏体化快冷至200℃等温处理后,组织为带有奥氏体薄膜的贝氏体铁素体、马氏体和残留奥氏体.75Si2Mn1.5CrB钢在200℃等温22 h时,其综合力学性能良好.
关键词:
高碳低合金钢
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贝氏体
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等温淬火
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组织
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力学性能
米振莉
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李志超
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范东亮
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王哲
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李煜
材料热处理学报
采用轧制结合Gleeble-3500热模拟试验机模拟连续退火,研究了以低温卷取和中间退火为主要特征的改进工艺对冷轧TRIP钢组织和力学性能的影响。结果表明,低温卷取有利组织细化,中间退火工艺在降低冷轧抗力的同时有利提高钢在最终退火后的残留奥氏体量。等温淬火温度不同时,贝氏体形态与残余奥氏体量均不同,在400～420℃时可获得较高体积分数的残余奥氏体。改进工艺配合适当热处理工艺参数（420℃×5 min）条件下,实验冷轧TRIP钢的抗拉强度达到1030 MPa,总伸长率保持20%,综合性能优良。
关键词:
TRIP钢
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工艺
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贝氏体等温淬火
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力学性能
