共查询到19条相似文献,搜索用时 528 毫秒
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研究了平整率(0~3.3%)和自然时效对830℃退火0.7 mm超低碳烘烤硬化钢板(%:0.003 0C、0.008Nb-0.003 Ti、0.003 0N和0.0030C、0.012Nb-0.012Ti、0.004 2N)力学性能和烘烤硬化性能的影响。结果表明,最初随平整率增加,由于柯氏气团减少和位错密度增加,屈服强度降低;当0.008Nb-0.003 Ti钢平整率达到0.48%,0.012Nb-0.012Ti钢平整率达到0.26%时,屈服强度降至最低;平整率继续增加由于冷加工硬化增强,钢的屈服强度升高。平整率过低和过高,均会导致烘烤硬化性能下降。平整率控制在0.5%~1.5%时,钢板能获得较低的屈服强度、较高的断后伸长率和最大的烘烤硬化性能。钢板经自然时效3个月,烘烤硬化性能和延伸率下降。 相似文献
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EAF-CSP流程钛微合金化高强钢板的组织和性能研究 总被引:6,自引:1,他引:6
珠钢采用Ti微合金化技术在EAF—CSP流程上成功地开发出屈服强度为450~700MPa的高强度热轧钢板。系统地研究了试验钢的组织和性能.并分析了组织与性能的关系。结果表明,随钛含量增加或成品厚度减薄钢板的屈服强度显著提高,最高达到695MPa;钛的质量分数低于0.024%时对屈服强度影响不大;当钛的质量分数低于0.045%时.钢板屈服强度的提高主要来自于晶粒细化,而当钛的质量分数大于0.045%后,钢板强度的进一步提高来自于沉淀强化。 相似文献
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铌对低碳钢形变板条马氏体组织再结晶的影响 总被引:1,自引:0,他引:1
研究了0.05%C-0.12%Nb钢板1200℃固溶,10%冰盐水处理-15%冷轧变形600~680℃时效时Nb对钢中板条马氏体再结晶行为的影响。试验结果得出在600~680℃范围内,Nb能阻止变形马氏体组织的再结晶,时效组织主要为保持板条马氏体位向的回火索氏体,未发现粒状铁素体。该钢在固溶处理 15%冷变形 640℃时效后的屈服强度为712.5MPa,抗拉强度740.0MPa,延伸率邀19.5%,而该钢经固溶处理 640℃时效后的屈服强度为490.0MPa,抗拉强度562.5MPa,延伸率δs22.5%,发现未经15%冷轧变形的0.05%C-0.12%Nb钢在时效过程板条马氏体组织发生明显的相变再结晶,表明时效过程变形能促进Nb的碳氮化物弥散析出,阻止板条-马氏体相变再结晶,从而提高钢的强度。 相似文献
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试验研究了0.001%~0.035%微量Ti对成分(%)为:0.32~0.37C,0.59~0.82Mn,0.20~0.34Si,0.07~0.09V,0.0015~0.0036B的35VB螺栓钢强度、塑性、冲击韧性、淬透性和断口组织的影响。试验结果表明,当Ti含量≥0.024%时能显著提高35VB钢的淬透性,与含0.001%~0.002%Ti的35VB钢相比,含0.024%~0.035%Ti的35VB钢屈服强度和抗张强度分别提高200MPa,延伸率△δ提高1%,断面收缩率△ψ,提高10%,冲击功提高50J。钢中含0.024%~0.035%的微量Ti可进一步稳定和提高35VB螺栓钢的质量。 相似文献
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为顺应集装箱减重的发展趋势,珠钢在EAFCSP流程上开发了基于Ti微合金化的高强度耐大气腐蚀钢板生产技术,屈服强度最高达到570MPa。系统地研究了试验钢的组织和性能,并分析了组织与性能的关系。结果表明,当Ti含量小于0.045%时,钢板屈服强度的提高来主要自于晶粒细化,而当Ti含量大于0.045%后,钢板强度的进一步提高主要来自于Ti(C、N)沉淀强化。 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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以△r和制耳指数较低的各向同性钢为研究对象,探讨了平整对各向同性钢板屈服延伸、r值及△r的影响规律。结果表明,在未平整的情况下,各向同性钢屈服延伸很长,需要较大的平整率才能消除屈服延伸,垂直于轧向的屈服延伸最难消除。r值测量表明,平整明显降低钢板垂直于轧向的r值,从而造成钢板平整前△r值较高,平整后△r趋近于0。通过制耳试验进一步验证,平整前后钢板的制耳指数差别很小,表明其平面各向异性差别不大。平整前后△r的变化是由屈服延伸过长使r值测量不准确造成的。实质上,平整对r值没有如此明显的影响。 相似文献
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退火温度及平整量对03Al钢板组织性能的影响 总被引:4,自引:0,他引:4
微碳深冲钢板(03Al),是国内为适应汽车工业发展的需要,开发研制的新一代深冲钢板。在试制生产中发现有时屈服强度σs 偏高,n 值偏低,游离渗碳体析出超标等现象。针对在实际生产中出现的问题,在实验室中对试样进行不同的退火温度(600~750 ℃)和不同压下量的平整(0.4 % ~2.4 % )试验,对组织和力学性能进行观察和测量,分析各种工艺参数对渗碳体析出、晶粒尺寸和性能的影响。结果表明:680~710 ℃退火和0.9 % ~1.2 % 的平整量是保证性能的关键因素之一。 相似文献
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The tensile properties of steel after temper rolling are affected by the reduction; low-Si Al-killed sheet steel was taken to study the effect of temper rolling on the tensile properties. The results indicate that the yield strength first decreases with the increase of reduction, and then increases. The relationship between the yield strength and the reduction can be expressed using quadratic function. The tensile strength increases with the increase of the reduction, while the total elongation decreases with the increase of the reduction, and the relationship between them and the reduction can be expressed using power function. Under the same condition, the results also indicate that the yield strength and tensile strength of steels across the rolling direction are all larger than those along the rolling direction; there is no obvious distinction between the total elongation along the rolling direction and that across the rolling direction. 相似文献
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The tensile properties of steel after temper rolling are affected by the reduction;low-Si Al-killed sheet steel was taken to study the effect of temper rolling on the tensile properties.The results indicate that the yield strength first decreases with the increase of reduction,and then increases.The relationship between the yield strength and the reduction can be expressed using quadratic function.The tensile strength increases with the increase of the reduction,while the total elongation decreases with the increase of the reduction,and the relationship between them and the reduction can be expressed using power function.Under the same condition,the results also indicate that the yield strength and tensile strength of steels across the rolling direction are all larger than those along the rolling direction; there is no obvious distinction between the total elongation along the rolling direction and that across the rolling direction. 相似文献
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Peng-Heng Chang 《Metallurgical and Materials Transactions A》1984,15(4):671-678
The effects of two processing variables, prior cold reduction and temper rolling, on the mechanical properties of a continuously
annealed 0.05 pct C low alloy dual phase steel were studied. It was found that cold rolling affected the strength of the dual
phase steel through its influence on the recrystallized ferrite grain size. The correlation between yield strength and mean
free path in ferrite was shown to follow a Hall-Petch type relationship. Similarly, temper rolling also had a pronounced effect
on the yield strength of the steel. The effect was strongly dependent upon the previous overaging treatment; the lower the
overaging temperature, the stronger the effect. Basically, the effect of temper rolling on dual phase steel was not much different
from that on mild steel and HSLA in terms of the change in yield strength and yield point elongation. Another interesting
observation was the influence of quenching rate on the strength of the dual phase steel. A slower quenching rate in the heavier
gauge dual phase steel caused pearlite rims to form around martensite colonies and thus decreased the strength of the steel. 相似文献
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回火温度对Q960级高强结构钢组织及力学性能的影响 总被引:1,自引:0,他引:1
以屈服强度960MPa级高强调质结构钢板开发为目标,研究了在相同轧制及淬火条件下,回火温度对试验钢显微结构及力学性能的影响。结果表明:随回火温度的升高,试验钢强度下降,韧塑性总体上呈现升高趋势,其中在300~450℃范围内出现一个韧塑性能的恶化区。当回火温度为600℃时,试验钢呈回火索氏体组织,屈服强度为1030MPa,抗拉强度为1080MPa,伸长率为15.9%,-40℃冲击功达144J,各项指标均满足国标GB/T 16270—2009要求。并对试验钢的拉伸力学性能进行了探讨。 相似文献
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试验钢采用50 kg中频感应炉熔炼,并轧成13mm钢板。试验了R1-0.15MoNb,R2-0.15MoV,R3-0.35MoNbV,R4-0.35MoNbVB和R5-0.35MoNbVTiB耐火钢的轧制温度(1 010~1 050℃)对该钢性能的影响。结果表明,R3钢(/%:0.04C,1.12Mn,0.32Si,0.018P,0.023S,0.35Cr,0.35Mo,0.025Nb,0.15N)在1030℃轧制后具有最佳的综合性能,即抗拉强度598 MPa、屈服强度514 MPa、延伸率28%、屈强比0.86、600℃回火前后HV硬度值分别为215和204、0℃冲击功124J;600℃的屈服强度355 MPa,屈强比为0.69,满足耐火钢国家标准要求。 相似文献
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Effect of Heat Treatment Process on Properties of 1000 MPa Ultra-High Strength Steel 总被引:1,自引:0,他引:1
Two types of steel, C-Mn-Cr-Mo-B microalloyed steel and C-Mn-Mo-Nb-Cu-B microalloyed steel, are designed to develop 1000 MPa ultra-high strength steel. Two kinds of processes, thermomechanical controlled process (TMCP) combined with traditional off-line quenching and tempering (QT) process versus controlled rolling process (CR) combined with direct quenching and tempering (DQ+T) process, are applied. The effect of heat treatment processing mode on the microstructure and mechanical properties is studied. The relationship between microstructure and mechanical properties is investigated by SEM and TEM. After tempering at 450 to 550 ℃ for 1 h, the steel produced by TMCP+QT process shows combination of excellent strength and low temperature toughness. The yield strength is above 1000 MPa, elongation above 15% and impact energy at -40 ℃ more than 30 J. After tempering at 450 ℃, a large number of ε-Cu particles precipitated in C-Mn-Mo-Nb-Cu-B steel produced by CR+DQ+T process lead to a significant increase in yield strength. And after tempering at 500 to 600 ℃, the yield strength of the steel is further improved to 1030 MPa because of precipitates, such as nitride or carbide of niobium, carbide of molybedenum and vanadium. When the tempering temperature is increased above 620 ℃, the yield strength is still higher than 1000 MPa and elongation is above 20% and impact energy at -40 ℃ is more than 35 J. After tempering at above 500 ℃, the toughness of the steel treated by TMCP+QT process is superior to that of steel by CR+DQ+T process. 相似文献