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U75V钢轨时效性能的研究吉玉1,任安超1,程正刚2(1.湖北省武汉市武汉钢铁(集团)有限公司研究院2.武钢条材总厂,湖北武汉 430083)摘 要:采用自然时效和人工时效方法研究了温度,时间对性能,成分的影响.结果表明:随着时间增加及温度升高,U75V钢轨存在屈服强度提高而残余应力和氢含量下降的现象,具有一定时效性.屈服强度提高对钢轨的使用性能有利,而残余应力的降低有利于提高铁路运行的安全性.关键词:U75V钢轨; 时效性能; 力学性能......
Aging Effect on Lanthanum Doped Ferroelectric Lead Titanate Ceramics Jin Xueqin1,Zhu Yudan1,Zhu Jie1,Sun Dazhi1 (1.Department of Chemistry, Shanghai Normal University, Shanghai 200234, China) Abstract:Ferroelectric devices are widely applied in many fields, such as energy conversion and communication. The aging effect in ferroelectric materials plays a central role in the reliability......
of aging treatment. The precipitate keeps coherent with the matrix and forms a quite strong coherent stress field. Combined action of coherent stress field and applied stress field makes... internal friction peaks correspond to TiNi-2 alloy with a Ni content of 50.2%. Thus, no precipitate appears during aging treatment, which results in the absence of coherent stress field. That is why the high......
J. Cent. South Univ. Technol. (2010) 17: 666-673 DOI: 10.1007/s11771-010-0538-9 Effect of strain hardening and strain softening on welding distortion and residual stress of A7N01-T4 aluminum alloy...; Abstract: The effect of strain hardening and strain softening behavior of flow stress......
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] GUPTA A K, SINGH S K, REDDY S, HARIHARAN G. Prediction of flow stress in dynamic strain aging regime of austenitic stainless steel 316 using artificial neural network [J]. Mater Des, 2012, 35: 589-595...J. Cent. South Univ. (2016) 23: 1863-1872 DOI: 10.1007/s11771-016-3241-7 Flow stress behavior and constitutive modeling of 20MnNiMo low carbon alloy WANG Meng-han(王梦寒), WANG Gen-tian(王根田), WANG Rui......
leads to the decrease of recovery ratio. The stress hysteresis shows the opposite dependence on aging temperature. The relationship between aging treatment and martensitic transformation...) shows the dependence of on aging temperature. The critical stress of the solution-treated sample is also given in dashed-line. All of the aged samples show larger than the solution-treated......
; Al-Zn-Mg-Cu铝合金时效工艺 Table 2 Aging system of Al-Zn-Mg-Cu aluminum alloy 透射电镜样品在MTP-1型双喷电解减薄仪上双喷减薄,穿孔.电解液为硝酸与甲醇的混合液,体积比为3:7,温度为-20~30 ℃,电压为12~15 V,电流为50~70 mA.在TECNAIG220透射电镜上观察,加速电压为200 kV.疲劳试验...,硬度随着时效时间的增加而逐步降低.因此,将三级时效工艺确定为(120 ℃,0.5 h(水冷))+(65 ℃,240 h)+(120 ℃,24 h). 图1 三级时效处理后合金的硬化曲线 Fig. 1 Hardening curves of alloys by three-stage aging 图2所示为合金经不同时效处理后的硬度结果柱状图.从图2可知,二级时效后合金的硬......
. Effects of aging time and stress-strain cycle on superelasticity of Ti-Ni-Zr shape memory alloy[J]. The Chinese Journal of Nonferrous Metals, 2021, 31(6): 1536-1544. DOI: 10.11817/j...Ti-50.8Ni-0.1Zr合金超弹性,应力诱发马氏体临界应力σM,能耗△W和残余应变εR的影响 Fig. 2 Effect of aging time on superelasticity (a), critical stress σM for stress-induced martensite, energy dissipation △W and residual strain εR (b......
with the increase of the secondary aging temperature and time. Thus, the strength of alloys decreases while the stress corrosion cracking (SCC) resistance increases. The influence of secondary aging...%, 22.9 MS/m, respectively. Key words: 7085 alloy; orthogonal experiment; two-step aging; tensile properties; stress corrosion Al-Zn-Mg-Cu合金具有高比强度,较好的抗腐蚀性能和断裂韧性,广泛应用于飞行器的主承力结构件[1-3].20世纪60年代之前,Al-Zn-Mg......