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鞍钢A220BH烘烤硬化冷轧钢板的开发 总被引:1,自引:0,他引:1
介绍了鞍钢A220BH烘烤硬化冷轧钢板的开发,研究了预应变,时效温度,保温时间对烘烤钢板硬化值的影响,测定了时效指数,试验证明,鞍钢生产的烘烤硬化钢板是屈服强度≥220MPa,具有适中烘烤硬化值及良好成形性汽车用钢板,能够灌汽车实际生产需要。 相似文献
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在高强度钢板中,超低碳烘烤硬化钢板(简称BH钢板)是新型优质汽车用薄板.在生产BH钢板时,需要有效地控制屈服强度,以保证较好的深冲性能.采用四方图识别了影响屈服强度的关键因素,包括化学成分、热轧参数、冷轧参数等;基于大量的生产过程历史数据,分别用回归分析、神经元网络、决策树三种不同方法进行分析,建立各关键输入变量(KIV)对屈服强度(KOV)影响的多变量模型.以神经元网络模型为例,进行了模型评价.以该模型为基础,在已知某些KIV取值的情况下,能够较为准确地预测BH钢成品的屈服强度,合格率提高7个百分点,取得了较好的经济效益. 相似文献
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《钢铁钒钛》2017,(5)
将C-Mn钢加热至800℃保温60 s后,随即快速冷却至300℃进行过时效处理以模拟连续退火工艺,最终获得铁素体和马氏体双相组织,然后进行预应变和烘烤处理以测量其BH2值。研究了预应变、烘烤温度和烘烤时间对780 MPa级冷轧双相钢微观组织演变和烘烤硬化性能的影响。结果表明,在0~2%范围内,BH2值随预应变增加而明显提高;在2%~8%范围内,BH2值随预应变增加而降低;预应变为2%时,BH2值达到最大值51 MPa。在140~300℃范围内,随着烘烤温度提高,在铁素体中形成的Cottrell气团和碳化物,以及马氏体中析出的碳化物数量增加,双相钢的烘烤硬化性能明显提高;烘烤温度为300℃时,BH2值达到最大值102 MPa。在5~240 min范围内,随烘烤时间的延长,促进了Cottrell气团的形成和碳化物的析出,BH2值逐渐增加。 相似文献
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测定了ULC-BH钢1 mm退火冷轧钢板(/%:0.002C,0.008Si,0.60Mn,0.043P,0.009S,0.031Al,0.071Ti)经2%~10%预应变,170℃20 min烘烤后的烘烤硬化(BH)值,通过内耗实验获得不同应变时效下的内耗谱线,利用X射线衍射技术测定位错密度,研究了Cottrell气团对ULC-BH钢烘烤硬化性能的影响。结果表明,随预应变量增加,ULC-BH钢的BH值增大;随预应变量增加,Snoek峰逐渐降低,而SKK峰逐渐升高;经2%、6%和10%预应变,位错密度增大,分别为3.9×1010/cm~2,8.4×1010/cm2和6.8×1011/cm2,相应的Cottrell气团密度逐渐减小。 相似文献
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This paper describes processes leading to local bake hardening (BH) effects in multiphase steels. The investigations are part of a comprehensive project which investigates the influence of the deformation path and of the temperature and duration of thermal treatments on strengthening in modern multiphase steels, in regard to both local and bulk properties of steel structures. Dual phase (DP), retained austenite steels (TRIP) ‐ both hot and cold rolled ‐ and complex phase (CP) steel are investigated to examine the effect of thermomechanical processing parameters on local bake hardening ability. For this purpose two ways to achieve a local BH effect, i.e. local deformation and local heat treatment, are studied, as well as ageing stability of the adjusted strength. Hardness increased after local deformation through bending as result of work hardening and bake hardening effect. The local heat treatment leads to an improvement of mechanical properties (hardness and strength) and to local strengthening of material. The stability of the local bake hardening effect could be confirmed. 相似文献
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研究了平整对罩式退火生产的BH钢板力学性能和自然时效性能的影响。结果表明,平整对BH钢的BH性能有显著影响,平整延伸率在1.0%~2.0%之间时BH值有最大值;平整使得BH钢的屈服强度先下降而后上升,屈服强度最小时的平整延伸率消除了钢板单向拉伸时的屈服点延伸现象;足够的平整延伸率是BH钢抗自然时效性能的有效保证。实验结果在工业生产中得到了应用。 相似文献
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汽车用含铜高强度薄钢板 总被引:4,自引:1,他引:3
介绍了最新开发的汽车用含铜高强度热轧薄板和冷轧薄板。在超低碳钢中添加1%以上的铜,利用含铜相的沉淀硬化,获得了高强度和优良成形性兼备的冷轧和热轧薄板。含铜热轧薄板是一种热处理强化类型钢,经时效热处理使铜析出,产生强烈沉淀硬化,钢的抗拉强度在原基础上提高200MPa以上。 相似文献
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Cold rolled, intercritically annealed TRIP steels will very likely be used as electrogalvanized sheet steel for passenger safety‐related automotive body parts. This implies that their properties during and after manufacturing, i.e. in the deformed and paint‐baked state, must be known to evaluate their actual in‐service properties. The ageing behaviour of electrogalvanized TRIP steels and the effect of controlled ageing of the complex microstructure by paint baking on the mechanical properties was therefore investigated. Electroplating tests showed that the H uptake during pretreatment and electrogalvanization is limited and that the paintability of the electroplated sheet steel is unaffected even after deformation induced transformation of the austenite. In addition, a strong bake hardening effect was found in the case of the CMnAlSi TRIP steel. Internal friction measurements indicated that a damping peak for interstitial C could be obtained but that the free C content was less than 1 ppm prior to paint baking. A BH mechanism for TRIP steels is proposed. 相似文献