共查询到17条相似文献，搜索用时 312 毫秒
1.
以废钢、废机铁及回炉料为主要原料,配以增碳剂和球化剂,通过中频炉熔炼,同步生产出了铁素体球墨铸铁管件及其Y形单铸试样。单铸试样的力学性能测试及金相组织观察结果表明:所生产的球墨铸铁其抗拉强度平均为455.0 MPa,屈服强度平均为328.2 MPa,布氏硬度平均为171.0 HBW,伸长率平均达到15.3%,优于GB/T 1348-2019中QT450-10的性能指标;基体组织为多边形铁素体,球状石墨分布均匀、圆整度较好、大小相差不大,有点状石墨存在,能够满足此类管件产品的性能要求。 相似文献
2.
《武汉工程职业技术学院学报》2016,(2)
研究了4种以C、Mn元素为主的试验钢,在相同轧制及淬火工艺下的组织与力学性能,并利用金相与透射电镜对淬火、回火后的试样进行了组织分析。试验结果表明:当C含量为0.21%、Mn含量为1.5%~1.9%时,经过860℃保温600s后水冷,然后再加热至350℃时效600s后空冷,试样的屈服强度达到1145~1171MPa,抗拉强度达到1270~1304MPa,伸长率A_(80mm)≥3.05%。微观组织分别表现为:淬火后的试样中板条马氏体居多,而回火后的试样中板条马氏体内有大量碳化物析出。 相似文献
3.
分析了退火工艺对轴瓦钢背用冷轧带钢性能的影响,结果表明,延长退火保温时间、提高退火温度有利于改善渗碳体分布,并增加延伸率。在保温时间为4小时、退火温度为700℃的退火工艺条件下,试验钢的延伸率达到43%的最高值,其屈服强度为220MPa,抗拉强度为355MPa,金相组织为铁素体＋渗碳体,渗碳体分布均匀。 相似文献
4.
本文设计了三种含铌量不同的微合金试验钢,采用热处理模拟方法研究了900℃奥氏体化550℃等温处理后试验钢的组织与性能,结果表明:低铌钢热处理后组织为多边形铁素体加少量板条贝氏体铁素体,随着铌含量增加,试验钢组织中板条贝氏体铁素体含量明显增加,且组织细化,同时随着铌含量的增加强度提高,中高铌试验钢的屈服强度可达到400MPa水平,且屈强比较小。 相似文献
5.
利用慢应变速率拉伸试验(SSRT)研究了三种980MPa级汽车薄板钢的延迟开裂性能。试验结果表明,DP980钢组织为马氏体+铁素体,QP980钢组织为马氏体+铁素体+少量残留奥氏体,TWIP980钢组织为单一奥氏体及奥氏体内部的大量退火孪晶。在5%NaCl溶液中,DP980、QP980和TWIP980钢的抗延迟断裂性能依次变好,TWIP980钢的抗延迟断裂性能最好。 相似文献
6.
对工业化生产的C-Mn-Al系高强度、高塑性冷轧钢板的组织和性能进行了研究,材料的抗拉强度为730MPa,屈服强度为470MPa,延伸率达到28%,屈强比为0.63;钢中的主要强化元素为C、Mn、Al,相应的最大含量分别小于0.21%、1.5%、1.6%,材料的原料成本低,生产工艺适应性好。 相似文献
7.
为了改善超高强度钢的塑韧性,实验分析了奥氏体化温度分别为840℃、880℃、920℃与等温温度分别为275℃、325℃、375℃对中碳超高强度钢组织性能的影响．结果表明,随着奥氏体化加热温度的升高,贝氏体/马氏体复相组织趋向粗大,钢的强度上升,而塑韧性下降;随着等温温度的升高,钢的抗拉强度呈平缓下降趋势,而钢的塑韧性在275～325℃等温温度范围内呈上升趋势,在325～375℃等温温度范围内呈下降趋势．在试验等温处理温度范围内,奥氏体化温度880℃×30min保温＋等温温度325℃×2min保温油冷,可获得强韧性配合良好的贝氏体/马氏体复相组织,钢的残余奥氏体的含碳量≥76．％,钢的抗拉强度Rm≥2065M Pa ,断面收缩率ψ≥255．％． 相似文献
8.
研究了45钢由马氏体＋屈氏体＋少量铁素体组成的混合组织及其高温回火后的性能,得出结论：只有当马氏体的体积百分含量大于50％,其性能才得到改善,并随马氏体含量的增加而增加。 相似文献
9.
时红宇 《太原大学教育学院学报》2021,(3):54-59
研究了淬火和回火处理对连铸连轧和传统热轧汽车用SCM430钢显微组织、硬度、拉伸性能和冲击性能的影响,并与传统热轧45#钢、16Mn钢和Q355钢进行了耐磨性对比.结果表明:连铸连轧态SCM430钢的组织为铁素体(F)+珠光体(P),淬火后组织为马氏体(M)+少量残余奥氏体(A),回火后组织为M;传统热轧态SCM430... 相似文献
10.
《武汉工程职业技术学院学报》2020,(2)
运用光学金相显微镜、透射电镜(TEM)、配备电子背散射衍射(EBSD)系统的场发射扫描电镜(SEM)等检测仪器,通过分析不同热处理工艺下高强热成形钢的组织演变、奥氏体晶粒度、晶界的变化,探索出奥氏体化温度和保温时间对于超高强热成形钢组织的影响规律。研究结果表明,随着加热温度和保温时间增加,热成形钢的组织由马氏体与铁素体的混合组织最终转变为单一马氏体组织。因此在特定温度保持一定的时间,热成形钢则可得到理想的马氏体组织,从而具有比较高的强度。透射电镜分析表明该钢的马氏体类型主要是板条状和棱镜状两种结构。 相似文献
11.
对进口冶金锯片用钢8CrNi的轧态及450~500℃温度范围内的回火组织及力学性能进行了观察与测试。结果表明:轧态组织是由珠光体构成,淬火后随着回火温度的升高,合金由淬火马氏体逐渐转化为回火马氏体+回火索氏体;试样的强度及硬度连续下降,而冲击韧性、断面收缩率和延伸率逐渐提高。对比65Mn钢板发现,8CrNi的回火抗力提高而屈强比下降。 相似文献
12.
Amorphous SiBCNAl powders were prepared via a mechanical alloying (MA) technique using crystalline silicon (Si), hexagonal boron nitride (h-BN), graphite (C), and aluminum (Al) as starting materials. SiBCNAl powders were consolidated by a hot pressing (HP) technique at 1800 °C under a pressure of 30 MPa in argon and nitrogen. The sintering atmosphere had a great influence on the microstructures and mechanical properties of the ceramics. The two ceramics had different phase compositions and fracture surface morphologies. For the ceramics sintered in argon, flexural strength, fracture toughness, elastic modulus and Vickers hardness were 421.90 MPa, 3.40 MPa·m1/2, 174.10 GPa, and 12.74 GPa, respectively. For the ceramics sintered in nitrogen, the mechanical properties increased, except for the Vickers hardness, and the values of the above properties were 526.80 MPa, 5.25 MPa·m1/2, 222.10 GPa, and 11.63 GPa, respectively. 相似文献
13.
通过制备4种不同锰镍比的TWIP合金铸铁,研究了锰镍比对Fe-Mn-Ni系TWIP合金铸铁组织和力学性能的影响。试验结果表明:随着锰镍比从3∶2、2∶1、3∶1和4∶1逐渐增加,铸铁铸态组织中的碳化物含量增加。在1 050 ℃保温10 h后进行水淬,就能使碳化物分解,获得单相奥氏体基体组织。经过热处理后,锰镍比为3∶2的TWIP合金铸铁力学性能最佳,其抗拉强度为885 MPa,伸长率为29.7%。 相似文献
14.
To prevent expanded polystyrene (EPS) beads from rising up to the surface in the molding process of EPS lightweight concrete, vibration with pressure was applied and the polyvinyl acetate (PVA) emulsion was adopted to im-prove its mechanical properties. The mechanical properties, thermal properties and durability of EPS lightweight concrete were tested. The microstructures of EPS lightweight concrete were observed by scanning electron microscope (SEM). Vibration with pressure reduces the number of small cracks. The 180 d compressive strength and flexural strength increase obviously as a large amount of PVA was added. The mixed amount of PVA has no obvious influence on the thermal per-formance when it is not more than 10% of the cement. Vibration with pressure and surface modification of EPS beads by PVA improve the combination of EPS beads with cement stone and the mechanical properties of EPS lightweight con-crete. 相似文献
15.
分析了板厚0.7mm的屈服强度180MPa级Nb超低碳烘烤硬化钢热轧及成品钢板的组织和织构,并进行了不同BH值钢板的常温时效实验。结果表明,试验钢板的成品晶粒度在8～9级有利于获得综合性能良好的烘烤硬化钢板,试验钢BH2值控制在35～50MPa的钢板综合性能最为理想。 相似文献
16.
Effects of finishing rolling temperatures and reduction on the mechanical properties of hot rolled multiphase steel were investigated. Thermo-mechanical control processing (TMCP) was conducted by using a laboratory hot rolling mill, in which three different kinds of finishing rolling temperatures and reduction and various austempering times were applied. The results showed that polygonal ferrite, granular bainite and larger amount of stabilized retained austenite can be obtained by controlled rolling processes, and that the strain-induced transformation to martensite from the retained austenite can occur gradually when the steel is deformed during tensile test. Mechanical properties increase with decreasing finishing rolling temperature and increasing amount of deformation. The most TRIP (transformation induced plasticity) effect, and ultimate tensile strength (UTS), total elongation (TEL) and the product of ultimate tensile strength and total elongation (UTS×TEL) are obtained at 20 min. 相似文献
17.
Using agarose as a gel agent to prepare ceramics is a suitable non-toxic gel-casting method. The effects of agarose concentration and addition amount on gel-cast 3Y-ZrO_2 green and sintered bodies were investigated. Green bodies were prepared by gel-casting using an agarose solution of a different agarose mass fraction including 3.0%, 3.5%, 4.0%, 4.5%, 5.0% and 5.5%with an added amount of agarose in the green body at a mass fraction of 0.7%, and using the agarose solution of a mass fraction of4.5% with a different amount of added agarose including 0.6%, 0.7%, 0.8%, 0.9%, and 1.0% in terms of mass fraction. The green bodies were sintered at 1 600 °C for 4 h. The relative density, linear shrinkage, and bending strength of the green bodies, and the density, microstructure, bending strength, and fracture toughness of sintered samples were characterized and analyzed. Results show that comprehensive properties of green bodies made with 4.5%(in terms of mass fraction) agarose solution added to an mass fraction of agarose in the slurry at 0.6% were the best, of which the bending strength was 3.14 MPa, the linear shrinkage was below 4.3%, and the relative density is 57.3%. For sintered bodies, the best fracture toughness was 5.63 MPa m~(1/2), and the optimal density was 5.88 g cm~(-3). 相似文献