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during homogenization. Furthermore, the Ce addition introduces changes in the precipitation process and consequently in the age-hardening behavior of the alloy. Microstructural measurements reveal that the addition of Ce promotes the precipitation of η' phase, but it also partly retards the precipitation of GP zones. The density of precipitates decreases in a certain degree and rod-like η......
线交点可确定1个计算定位点,采用4簇传感器进行震源定位,可计算得到6个定位结果. 图8 花岗岩平板4号震源定位计算示意图 Fig. 8 Location calculation of 4号 source on granite plate 图9和图10分别为对震源施加正弦波脉冲和雷克子波脉冲模拟声发射信号进行试验所得定位结果,其中,监测点布设方式采用图3所示的3种布设方式(I,II和III类).分...20%),其余定位结果较为集中,均在较优点范围内. 由图9和10所示的震源定位结果和表3中定位结果相对误差统计可知,2种震源激发方式(正弦波和雷克子波)均较好地验证了该震源定位方法在非连续介质的适用性与准确性. 图9 正弦波激发方式震源定位结果 Fig. 9 Source location results by the type of sine wave excitation 图10 雷克子波激......
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不同底吹位置对VD精炼脱碳过程的影响耿佃桥1,雷洪1,赫冀成1,黄健2,李秉强2(1.辽宁省沈阳市东北大学材料电磁过程研究教育部重点实验室2.本溪钢铁公司,辽宁本溪 117000)摘 要:采用数值模拟方法研究了VD精炼过程中不同底吹位置对钢液流场及脱碳过程的影响.研究结果表明:双底吹脱碳效果最好,偏心底吹次之,中心底吹最差;在偏心底吹下,当底吹位置距钢包中心0.4R~0.5R时脱碳效果最好,终点碳的质量分数最低为39×10-6;在双底吹条件下,当底吹位置距钢包中心0.50R~0.65R时脱碳效果最好,终点碳的质......
of the location after dynamic consolidation treatment of shallow foundation; part of ultimate side friction of soil layer are higher than the side friction value provided by the existing norms; testing......
Microscopic phase-field simulation for precipitation behavior of Ni-Al-Cr alloy during two-step aging ZHANG Ji-xiang(张济祥), CHEN Zheng(陈 铮), LIANG Min-jie(梁敏洁), WANG Yong-xin(王永欣), LAI Qing...; Abstract: Based on the microscopic phase-field model, the pre-aging temperature effects on the precipitation mechanism and microstructure evolution during two-step aging for Ni75Al9Cr16 alloy were......
(precipitation–time–temperature)曲线进行对比,讨论不同V和N质量分数对钢筋V(C,N)析出行为的影响.研究结果表明:高V和低V质量分数抗震钢筋都在870 ℃左右的鼻温区析出动力过程加快,大变形量可缩短析出开始时间,VN(0.04 V-0.0135 N)钢筋实测与计算PTT曲线吻合,采用VFe(0.076 V-0.005 5 N)钢筋计算PTT曲线应该考虑形变储能△Gs的作用. 关键...-temperature precipitation behavior of V-N microalloyed anti-seismic rebars L Yukun, SHENG Guangmin, HUANG Zhenhua, XUE Haofei (College of Materials Science and Engineering, Chongqing University, Chongqing......