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介绍了首钢第一线材厂生产SWRCH22A的工艺控制情况。通过对控冷工艺的优化,提高了产品性能,更好地满足了用户需求。 相似文献
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研究了钢中氮和铝形成AlN夹杂的条件及其对SWRCH22A钢性能的影响.结果表明:钢中AlN夹杂物是在凝固过程中析出的,对于有些钢种,少量的AlN在晶界析出,对钢的性能影响较小,甚至有益,因为它可以细化晶粒,但对于深加工前需要调质处理的SWRCH22A钢,晶粒如果过细,则在拉拔过程中反应出强度高,模具消耗大;另外,SWRCH22A钢在加工成自攻钉前的渗碳调质中,较高的晶粒度级别也会降低其调质性能。鉴于自攻钉专用冷镦钢深加工的特殊性,提出SWRCH22A钢盘条最合适的晶粒度范围为9-10级。 相似文献
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利用热模拟机进行单道次压缩实验,获得了梅钢B510L钢的应力-应变曲线变化规律,利用最小二乘法对数据进行回归分析,获得梅钢微合金化钢B510L钢发生再结晶的条件,建立了B510L的动态再结晶图。 相似文献
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冷镦钢SWRCH15A是近年武钢开发的包晶系列钢新钢种.通过对第一炉试验钢的生产工艺过程和产品质量进行分析,确定了关键工艺和相应参数.优化炼钢和连铸生产工艺后,大大提高了盘条的质量. 相似文献
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在各种变形条件下系统地研究了0.47%C(JIS-S45C)钢稳定奥氏体区内的热变形特性,以收集其高温变形和显微组织演变方面的基本数据。在稳定奥氏体区内,中碳钢在很大的温度(850℃~1150℃)和应变速率(10—3/s~100/s)范国内均显示了动态再结晶。动态再结晶晶粒度随稳态应力而单调递减。当$45C试样在850℃和1/s时变形时,经动态再结晶后得到的最小晶粒度为8.3μm。在现象逻辑模型的基础上,将应力-应变关系进行公式化。通过所得之公式估量出的应力-应变曲线与试验结果非常一致。 相似文献
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三钢高线厂基于连铸坯直接辊道热送热装生产的SWRCH22A盘条1/4冷顶锻的开裂率较高,其综合优质率只有63%.通过对裂纹形貌、显微组织和微区成分的分析发现顶锻开裂的原因在于钢中Cu、As、Sn元素在原奥氏体晶界处的偏聚以及热装组织处于铁素体和奥氏体两相区导致.多次生产实践表明通过控制有害微量元素和降低热装温度显著抑制了1/4冷顶锻裂纹的出现,产品合格率达到95%以上. 相似文献
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SWRCH22A冷镦钢在使用过程中容易发生拉拔断裂现象,对出现的几种拉拔断裂断口形式进行研究分析,总结了造成拉拔断裂的原因,主要是铸坯内部质量、金相组织以及模具未对中,并提出改进措施。 相似文献
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Hot compression deformation behaviors of medium carbon Cr-Ni-Mo-Nb steel were investigated at deformation temperatures ranging from 1223 to 1423 Kand strain rates of 0.1,1and 5s-1.Dynamic recovery(DRV)and dynamic recrystallization(DRX)were observed during the hot compression deformation.For all of the samples,DRX occurred at deformation temperatures above 1323 Kat different strain rates,while below 1223 K,no DRX was observed.The activation energy of the tested steel was determined as 386.06kJ/mol.The ratio of critical stress to peak stress and the ratio of critical strain to peak strain were 0.835 and 0.37,respectively.Kinetic equations interpreting the DRX behavior of the tested steel were proposed,and the corresponding parameters including the volume fraction and the average grain size were determined.Moreover,the microstructures induced under different deformation conditions were analyzed. 相似文献
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Du Shiwen Chen Shuangmei Song Jianjun Li Yongtang 《Metallurgical and Materials Transactions A》2017,48(3):1310-1320
Metallurgical and Materials Transactions A - Hot deformation and dynamic recrystallization behaviors of a medium carbon steel LZ50 were systematically investigated in the temperature range from... 相似文献
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Dan ZHANG Ya-zheng LIU Le-yu ZHOU Qiang HAN Bo JIANG Zhong-zhi LI 《钢铁研究学报(英文版)》2014,21(11):1042-1048
The hot deformation behavior of GCr15SiMn steel was studied through high temperature compression tests on the Gleeble-1500 thermal-mechanical simulator. The initiation and evolution of dynamic recrystallization (DRX) were investigated with microstructural analysis and then the process variables were derived from flow curves. In the present deformation conditions, the curves of strain hardening exponent (n) and the true strain (e) at the deformation temperature of 1423 K and strain rates of 0.1, 1 and 10 s^-1 exhibit single peak and single valley. According to Zener-Hollomon and Ludwik equation, the experimental data have been regressed by using linear method. An expression of Z parameter and hot deformation equation of the tested steel were established. Moreover, the Q values of GCrlSSiMn and GCr15 steels were compared. In order to determine the recrystallization fraction under different con ditions, the volume fraction of DRX as a function of process variables, such as strain rate (ε), temperature (T), and strain (ε), was established. Itwas found that the calculated results agreed with the mierostructure of the steel at any deformation conditions. 相似文献