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The effect of testing temperature on retained austenite (RA) stability of industrially cold rolled CMnSi sheet steel treated by quenching and partitioning (Q&P) process has been investigated by observing the deformation and transformation behavior of RA at different testing temperatures. Uniaxial tensile properties at different temperatures were determined and a correlation between RA stability and mechanical properties were also established. Ultimate tensile strength increases monotonously when temperature decreases, while total elongation reaches an optimum value between 0 and 20°C, where RA exhibits the greatest TRIP effect. Work hardening rate was calculated to decrease through three different stages in an oscillation manner, leading to significant enhancement in both strength and ductility. The kinetic of deformation‐induced martensite transformation is also studied and the stability of RA can be evaluated by comparing the kinetic parameter β. 相似文献
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60Si2Mn连铸方坯的生产实践 总被引:1,自引:0,他引:1
石横特钢厂通过严格保证钢水质量,控制钢水及铸坯温度,拉坯速度和冷却强度,并采用浸入式水口保持浇注技术,在普通机上生产出合格的优质钢连铸坯,文章以60Si2Mn合金弹簧钢为重点,阐述了生产符合标准要求的优质钢连铸方坯的电炉冶金及R5.25m罗可普型小方坯铸机的生产工艺参数。 相似文献
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淬火-配分(Quenching and Partitioning,简称QP)工艺是针对马氏体钢提出的热处理新工艺。利用QP工艺处理40Si2Ni2钢,并通过扫描电镜观察其微观组织特征。结果表明,与传统淬火+回火工艺得到的组织不同,QP组织为低碳(回火态)和高碳马氏体(淬火态)共存,其中高碳马氏体呈现为有规则几何形状、边界清晰、无析出物析出的块状组织,淬火温度(QT)对高碳马氏体(淬火态)量有影响。 相似文献
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Microstructure and Wear Resistance in Medium and High C Steels Treated by Quenching and Partitioning
Eider Del Molino Maribel Arribas Iñaki Pérez Félix Valdavida Javier Jesús González 《国际钢铁研究》2023,94(8):2300056
The quenching and partitioning (Q&P) steels have shown to be promising candidates to be applied in fields where wear resistance is required. In this study, a medium and a high C steel are heat treated by Q&P and the resulting microstructure, hardness, and wear resistance are characterized. The mechanical stability of the austenite phase under wear test conditions is investigated. It is found that the stability of austenite is very high in the high C steel and decreases in the medium C steel. Additionally, the hardness and wear behavior of the Q&P-treated steels are compared with the results obtained for quenching and tempering (Q&T) treated samples, showing that, although the hardness of Q&P steels is quite lower, the obtained wear rates are similar. It means that in the studied Q&P steels, although the austenite transformation into martensite does not occur considerably, the presence of austenite might play a key role in the wear resistance. 相似文献
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研究了淬火加热温度,渗扩氮冷待淬火对60Si2Mn钢的显微组织、硬度和亚结构的影响;对60Si2Mn钢制六角螺母冲头进行了寿命试验,采用模拟理想冷却曲线设计的方便易行、节能省时的渗扩氮冷待淬火强韧化热处理,冲头的使用寿命可提高2倍以上。 相似文献
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60Si2Mn弹簧钢半固态浆料的制备研究 总被引:2,自引:0,他引:2
研究了60Si2Mn弹簧钢半固态浆料的制备规律,结果表明:在本实验条件下,当搅拌时间为2min时,可以获得尺寸大小为100-300μm、固相率为40%~50%的球状初生奥氏体的半固态浆料,这样的半固态浆料便于从搅拌室底孔中放出;电磁搅拌使60Si2Mn弹簧钢熔体获得均匀的温度场和溶质场,抑制了发达的初生奥氏体枝晶的形成,为球状晶的获得奠定了基础;电磁搅拌引起蔷薇状初生奥氏体枝晶出现强烈的温度起伏和枝晶臂根部熔断是获得球状晶粒最重要的原因。 相似文献
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Dual-Phase (DP) steels are made of ductile ferrite phase and hard martensite phase.Although it became crucial in progress of automotive industry to save fuel consumption and reduce total weight of vehicles,we need more accurate estimation of distribution to mechanical properties in total amounts of specimen.DP steels have considerable difference of mechanical levels in each phase including ferrite and martensite.That is why this study focuses on deconvolution of experimental tensile curve into ferrite and martensite using EBSD for calculation of phase volume fractions and Swift equation.Nanoindentation for certain parameter of each phase was conducted to produce the deconvolution curves. 相似文献
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With the aim to study the role of “frozen” concentration gradient of manganese (Mn) element in stability of retained austenite (RA) with multiple-stage martensite transformation, a series of intercritical annealing (IA) temperatures is conducted before quenching and partitioning (Q&P) treatment. Morphology and distribution of RA are observed by field emission gun scanning electron microscope and electron back-scatter diffraction. The volume fraction (7%–16%) and stability of metastable RA is found to be affected profoundly by IA temperature. Thermodynamic and kinetic analysis are conducted to elucidate the evolution of RA in process of IAQP treatment. The predicted levels of RA are in good accordance with measurements. It is found that the inhomogeneous partitioning of Mn in period of IA, combining with the incomplete partitioning of carbon during Q&P, radically regulated the Q&P microstructure. The incomplete partitioning of carbon in RA, with excess carbon segregation at dislocations and boundaries, lead to partition-less bainite transformation owing to the average carbon content in RA lower than the “To” threshold. 相似文献
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介绍了安钢60Si2Mn热轧盘条的工艺特点、产品质量,及其在铁路弹簧扣件生产中的应用。冶炼工艺采取了多项关键技术以实现窄成分控制和钢水洁净度控制,保证了铸坯无缺陷生产;利用摩根第六代高速线材生产工艺设备,采用控轧控冷,盘条尺寸精确控制在13~13.2mm,抗拉强度为950~1050MPa,面缩为36%~47%,硬度为269~288HRB,组织为S+P+F,脱碳层深度小于1%D;生产的60Si2Mn弹条硬度为41~46HRC,组织为均匀回火索氏体,疲劳试验达到700万次无损坏,残余变形小于1mm,完全满足TB/T 1495.2和用户要求。 相似文献
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对采用氧气转炉熔炼+LF炉精炼|+连铸连轧工艺生产的60Si2Mn扁弹簧钢的化学成分,金相组织以及经870℃油淬+500℃水冷处理扣的力学性能进行测试,证明其内部质量良好,各项性能优良,同时指出,为完善连铸坯内部质量,C和Si的含量分别在0.56≤C≤0.60%,1.50≤Si≤1.80%,应控制C含量的波动在±0.02%内。 相似文献
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Emmanuel De Moor John G. Speer David K. Matlock Jai‐Hyun Kwak Seung‐Bok Lee 《国际钢铁研究》2012,83(4):322-327
Quenching and partitioning (Q&P) is receiving increased attention as a potential processing route to develop “Third Generation” advanced high strength steel (AHSS) properties. The Q&P process consists of quenching a steel from a reheat temperature to a pre‐determined temperature in the Ms ? Mf temperature region followed by a so‐called partitioning treatment at the quench temperature or higher. The present contribution investigates the Q&P response of laboratory‐processed CMnSi alloys with 3 or 5 wt% manganese. Samples were processed at quench temperatures between 70 and 250°C with partitioning temperatures of 400 and 450°C for times up to 100 s. Scanning electron microscopy and X‐ray diffraction were utilized to evaluate the Q&P microstructures. Attractive properties were generated with tensile strength/total elongation combinations such as 1500 MPa and 17%. 相似文献