共查询到19条相似文献,搜索用时 140 毫秒
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利用 MTS-810材料试验机测量了BG110S油井管在动态拉伸(边充氢边拉伸)实验中的力学性能,并利用扫描电镜观察分析了拉伸断口形貌,研究了动态充氢电流密度对油井管力学性能的作用,讨论了氢原子浓度对油井管氢脆敏感性的影响。实验结果表明:随着充氢电流密度的增加,BG110S试样的屈服强度和抗拉强度先增大后减小;试样的伸长率、断面收缩率及拉伸韧性连续降低;试样的拉伸断口形貌由韧性断裂特征向脆性断裂特征转变;试样的氢脆敏感性连续增加。当动态充氢电流密度i<30 mA/cm2时,氢原子在 BG110S试样中呈现固溶强化作用,而当i≥30 mA/cm2后,氢原子在BG110S试样中则呈现氢致脆化作用。 相似文献
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陈训浩 《冶金标准化与质量》1998,(8)
1 拉伸试样对钢管性能影响钢管的性能通过从钢管中切取样坯,然后制作成拉伸试样来测定。外径不大的钢管,其试样一般分为全截面试样和纵向试样两种,但它们的试验结果并不完全一致。1.1 冷拔无缝钢管厚壁较大规格的热轧钢管,冷拔为较小规格的不同无缝钢管,经冷矫直后进行热处理,成为最终产品。某厂采用20钢作为原材料,原材料冷拔为51×3.5mm和51×3mm两种规格产品。热处理采用900~930℃正火。1.1.1 两种试样反映不同效果我们分别从随机抽取的13个批号供货状态的钢管中,制作纵向试样和全截面试样。纵向试样宽度为15±0.2mm。51×3.5mm无缝… 相似文献
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摘要:采用金相显微镜和扫描电镜对30.8mm大壁厚X80管线钢不同减薄方式下DWTT试样截面微观组织和试验断口进行了分析,目的是研究减薄方式对大壁厚管线钢DWTT性能的影响。结果表明,随着试验温度的降低,单边减薄的DWTT性能优于双边减薄,而且双边减薄试样从表面至心部,贝氏体体积分数逐渐降低,多边形铁素体体积分数逐渐升高,晶粒尺寸变大,MA岛由细小的颗粒状变为尺寸较大的链状,且心部伴随着严重的偏析和夹杂。而单边减薄试样从表面至心部组织整体变化不大;裂纹优先沿着消耗能量最低的部位开裂,所以双边减薄试样心部出现比单边减薄试样严重的解理和逆解理断裂。 相似文献
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通过带头拉伸试样、不带头拉伸试样对比试验 ,证明对于SS40 0钢板 ,两种试样力学性能σs、σb、δ试验结果无显著差异 ,因而可以不带头试样代替带头试样 . 相似文献
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Effect of Sb on the microstructure and mechanical properties of AZ91 magnesium alloy 总被引:1,自引:0,他引:1
Qudong Wang Yanping Zhu Wenzhou Chen Wenjiang Ding M. Mabuchi 《Metallurgical and Materials Transactions A》2001,32(3):787-794
Effects of Sb addition on the microstructure, mechanical properties, and fracture behaviors of AZ91 magnesium alloy, as well
as the sensitivity to section thickness of the structure and mechanical properties, have been studied. The results show that
when Sb is added into the AZ91 alloy, the grain is refined, the Mg17Al12 phase is refined and granulated, and a new Mg3Sb2 phase is formed and becomes coarse needle-shaped as Sb content increases. The room-temperature tensile strength, elongation,
and impact toughness increase first, and then decrease with increasing Sb content. The study on sensitivity to section thickness
shows that, when composition is constant, the room-temperature tensile strength and elongation increase with the reduction
of section thickness; when section thickness is constant, the room-temperature tensile strength and elongation increase first,
and then decrease with increasing Sb content. Additionally, the Sb addition improves the tensile strength of the AZ91 alloy
at 100 °C and 150 °C. The room-temperature tensile and impact fractographs of the AZ91 alloy show intergranular fracture.
With increasing Sb content, the tearing deformation zones on the both fractographs enlarge at first, and then diminish, which
is consistent with the change of tensile strength, elongation, and impact toughness increasing first, and then reducing with
increasing Sb content. 相似文献
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Effect of Sb on the microstructure and mechanical properties of AZ91 magnesium alloy 总被引:4,自引:0,他引:4
Qudong Wang Wenzhou Chen Wenjiang Ding Yanping Zhu M. Mabuchi 《Metallurgical and Materials Transactions A》2001,32(13):787-794
Effects of Sb addition on the microstructure, mechanical properties, and fracture behaviors of AZ91 magnesium alloy, as well
as the sensitivity to section thickness of the structure and mechanical properties, have been studied. The results show that
when Sb is added into the AZ91 alloy, the grain is refined, the Mg17Al12 phase is refined and granulated, and a new Mg3Sb2 phase is formed and becomes coarse needle-shaped as Sb content increases. The room-temperature tensile strength, elongation,
and impact toughness increase first, and then decrease with increasing Sb content. The study on sensitivity to section thickness
shows that, when composition is constant, the room-temperature tensile strength and elongation increase with the reduction
of section thickness; when section thickness is constant, the room-temperature tensile strength and elongation increase first,
and then decrease with increasing Sb content. Additionally, the Sb addition improves the tensile strength of the AZ91 alloy
at 100°C and 150°C. The room-temperature tensile and impact fractographs of the AZ91 alloy show intergranular fracture. With
increasing Sb content, the tearing deformation zones on the both fractographs enlarge at first, and then diminish, which is
consistent with the change of tensile strength, elongation, and impact toughness increasing first, and then reducing with
increasing Sb content. 相似文献
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为进一步掌握在线余热淬火处理对钢轨组织性能的影响关系和机理,采用扫描电镜对热轧态钢轨和在线余热淬火处理后的钢轨进行了全断面的组织观察,利用维氏硬度仪和拉伸试验机对比分析了在线余热淬火对钢轨力学性能的影响。结果表明,在线余热淬火和热轧态钢轨全断面的组织全部为片层状珠光体组织,但淬火轨珠光体片间距明显较小,热轧态钢轨珠光体片间距为0.113~0.284 μm,淬火轨片间距为0.076~0.148 μm。热轧态钢轨全断面显微硬度相差不大,在线余热淬火钢轨显微硬度普遍较热轧态钢轨高。在线余热淬火可以有效提高U75V钢轨性能,热处理后钢轨抗拉强度和伸长率分别较热轧态提高16.6%和20%,有效改善了钢轨的使用性能。 相似文献
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船板钢机械性能包括屈服强度、抗拉强度、断面收缩率以及冲击功,其机械性能取决于微观组织、钢的成分等因素,故应尽量减少化学成分波动对机械性能的影响.通过Matlab软件利用工业生产实际大数据建立不同元素含量下S含量与DH36船板钢机械性能的数学模型.研究发现DH36船板钢的冲击功随着S含量的升高呈先增后减的趋势. DH36船板钢的屈服强度、拉伸强度、断面收缩率均与S含量呈非线性关系,趋势与其他元素的含量有关. 相似文献
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摘要:以热轧耐低温H型钢为研究对象,采用光学显微镜、扫描电镜、透射电镜分析和力学性能测试等手段,研究了完全淬火和亚温淬火对试验钢微观组织和力学性能的演变规律。结果表明,试验型钢经780℃亚温淬火+600℃回火处理后,形成回火索氏体+铁素体的网状组织;试验型钢900℃淬火+600℃回火处理后,转变得到具有马氏体位向的回火索氏体,碳化物分布更加细小均匀,位错密度下降。2种热处理工艺制备H型钢综合力学性能优良,屈服强度均达到500MPa以上,900℃淬火+600℃回火处理后钢的屈服强度和抗拉强度更高。-40℃低温冲击韧性比热轧状态下出现大幅度提高,随着淬火温度升高冲击功更加稳定。 相似文献
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采用固相烧结工艺(1 300℃保温1 h)制备低钨含量(质量分数为60%~80%)的W-Ni-Fe合金,测定合金的抗拉强度、抗压强度和伸长率,利用金相显微镜观察合金的显微组织,并通过扫描电镜(SEM)观察合金断口形貌,研究钨含量对固相烧结W-Ni-Fe合金力学性能与微观结构的影响。结果表明:随钨含量降低,合金的孔隙率和平均孔径减小,抗拉强度增大,伸长率显著提高,抗压强度变化不大。W含量为60%~80%的W-Ni-Fe合金,其孔隙率为17.8%~21.4%,抗拉强度为231~262 MPa,抗压强度2 450~2 550 MPa,伸长率为0.3%~2.3%,压拉比为9.45~11.04,都能满足易碎型穿甲弹弹芯材料的性能要求。 相似文献
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Fabrication and properties of heavy section extrusions of Ti-6Al-6V-2Sn and Ti-8Mo-8V-2Fe-3AI alloys
This study is concerned with the fabrication in heavy section of the titanium alloys Ti-8Mo-8V-2Fe-3Al (Ti-8823) and Ti-6Al-6V-2Sn
(Ti-662). The technique utilized to achieve 84 pct reduction during the extrusion of heavy section cylindrical hollows is
given. The response to subsequent aging of both alloys is described in terms of the effect on important mechanical properties
such as yield and ultimate tensile strength, ductility and fracture toughness. For the Ti-8823 alloy extruded in heavy section,
it is shown that the optimum heat treatment consists of aging directly after hot working rather than the more common solution
treatment and age cycle. With the former heat treatment, uniform through the thickness mechanical properties are obtained.
Uniform mechanical properties are also obtained through the section of the Ti-662 extrusion with a solutionizing and overaging
heat treatment. 相似文献
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针对"直接热挤压"和"热挤压+脉冲锻打"TA15钛合金薄壁型材的室温力学性能及差异开展实验研究。通过对型材不同位置切取的试样进行拉伸试验,获得了型材抗拉强度和屈服强度分布规律,并对性能数据分布的均匀性和一致性进行深入分析。结果表明,"直接热挤压"态型材的抗拉强度和屈服强度数值分布较分散,强度离散系数大于3.5%;而"热挤压+脉冲锻打"态型材的抗拉强度和屈服强度数值分布相对集中,不同批次型材之间的力学性能一致性较好,强度离散系数均小于3%。进一步分析表明,2种状态型材之间的性能差异与型材表面状态、表面细晶层和截面尺寸有关。脉冲锻打能够改善型材表面细晶层分布的均匀性和截面尺寸精度,从而改善型材力学性能分布的均匀性和一致性。 相似文献