对装配式钢结构用C-Mn和C-Mn-Sn钢进行了焊接热模拟试验,研究了不同焊接线能量下Sn元素对钢结构用钢显微组织、物相组成和韧-脆转变温度的影响,并分析了Sn的晶界偏聚行为及其对焊接接头热影响区脆化作用的影响。结果表明,C-Mn和C-Mn-Sn...对装配式钢结构用C-Mn和C-Mn-Sn钢进行了焊接热模拟试验,研究了不同焊接线能量下Sn元素对钢结构用钢显微组织、物相组成和韧-脆转变温度的影响,并分析了Sn的晶界偏聚行为及其对焊接接头热影响区脆化作用的影响。结果表明,C-Mn和C-Mn-Sn钢的韧-脆转变温度会随着焊接线能量的增加先增大后减小;当焊接线能量为36 k J/cm时,Sn对焊接热影响区起到了明显的脆化作用,而在焊接线能量为60 k J/cm和100 k J/cm时,Sn的存在并没有使焊接热影响区明显脆化;当焊接线能量为36 k J/cm时,C-Mn-Sn钢中Sn的晶界浓度测量值为0.24at%,Sn晶界浓度修正值为0.77at%;焊接线能量为60 k J/cm和100 k J/cm时,C-Mn-Sn钢中晶界的破坏使得由晶界偏聚和晶界Sn偏聚引起的脆化作用消失;在三种焊接线能量下,含Sn的C-Mn-Sn钢的显微硬度都要小于不含Sn的C-Mn钢。展开更多
对C-Mn和C-Mn-Sn钢进行了焊接热模拟试验,研究了不同焊接线能量下Sn元素对建筑用钢显微组织、物相组成和韧-脆转变温度的影响,并分析了Sn的晶界偏聚行为及对焊接接头热影响区脆化作用的影响。结果表明,随着焊接线能量的增加,C-Mn和C-Mn...对C-Mn和C-Mn-Sn钢进行了焊接热模拟试验,研究了不同焊接线能量下Sn元素对建筑用钢显微组织、物相组成和韧-脆转变温度的影响,并分析了Sn的晶界偏聚行为及对焊接接头热影响区脆化作用的影响。结果表明,随着焊接线能量的增加,C-Mn和C-Mn-Sn钢的韧-脆转变温度都呈现为先增加而后降低的趋势;焊接线能量为36 kJ/cm时,Sn对焊接热影响区起到了明显的脆化作用,而在焊接线能量为60 kJ/cm和100 k J/cm时,Sn的存在并没有使焊接热影响区明显脆化;当焊接线能量为36 k J/cm时,C-Mn-Sn钢中Sn晶界浓度修正值为0.77at.%;焊接线能量为60 kJ/cm和100 kJ/cm时,C-Mn-Sn钢中晶界的破坏使得晶界偏聚和由晶界Sn偏聚引起的脆化作用消失;在三种焊接线能量下,含Sn的C-Mn-Sn钢的显微硬度都要小于不含Sn的C-Mn钢。展开更多
The microstructural observation,the mass loss test,potentiodynamic polarization measurements and corrosion morphology examinations were conducted to study the influence of microstructural characteristics on corrosion ...The microstructural observation,the mass loss test,potentiodynamic polarization measurements and corrosion morphology examinations were conducted to study the influence of microstructural characteristics on corrosion behavior of Mg–5Sn–3In alloys in Hank’s solution after extrusion.The results show that the corrosion rate of the as-cast alloy is similar to that of as-extruded alloy;however,the local corrosion susceptibility is greatly weakened in the as-extruded alloy,especially in the extrusion direction.The relatively uniform corrosion morphology of the as-extruded alloy is attributed to refined Mg_(2)Sn particles,uniform distribution of Mg_(2)Sn particles and favorable crystal orientation.Meanwhile,the cytotoxicity tests confirm that the Mg–5Sn–3In alloy exhibits cytotoxicity of Grade 0−1 for NIH3T3 cells,suggesting an acceptable cytotoxicity of this alloy in the vitro assay.展开更多
The effect of Sn, Ca, Al, Si and Zn addition on the compressive strength of cast Mg-Sn-Ca （TX） alloys was studied in the temperature range of 25-250 °C and correlated with the microstructure. The Sn to Ca mass ...The effect of Sn, Ca, Al, Si and Zn addition on the compressive strength of cast Mg-Sn-Ca （TX） alloys was studied in the temperature range of 25-250 °C and correlated with the microstructure. The Sn to Ca mass ratio up to 2.5 contributes to the formation of Mg2Ca phase at the grain boundaries and CaMgSn in the matrix, while a ratio of 3 gives only CaMgSn phase mostly in the matrix. While the compressive strength decreases with the increase in temperature, for Sn/Ca up to 2.5, a plateau occurs in 100-175 °C, which is attributed to the strengthening by Mg2Ca. However, for ratio of 3, the strength is lower and decreases more gradually. Mg-3Sn-2Ca （TX32） has the highest strength and the addition of 0.4%Al increases its strength but simultaneous addition of Si lowers the strength. Likewise, the addition of Zn improves its strength but simultaneous addition of Al slightly decreases the strength. The results are correlated with the types of intermetallic phases that form in various alloys.展开更多
文摘对装配式钢结构用C-Mn和C-Mn-Sn钢进行了焊接热模拟试验,研究了不同焊接线能量下Sn元素对钢结构用钢显微组织、物相组成和韧-脆转变温度的影响,并分析了Sn的晶界偏聚行为及其对焊接接头热影响区脆化作用的影响。结果表明,C-Mn和C-Mn-Sn钢的韧-脆转变温度会随着焊接线能量的增加先增大后减小;当焊接线能量为36 k J/cm时,Sn对焊接热影响区起到了明显的脆化作用,而在焊接线能量为60 k J/cm和100 k J/cm时,Sn的存在并没有使焊接热影响区明显脆化;当焊接线能量为36 k J/cm时,C-Mn-Sn钢中Sn的晶界浓度测量值为0.24at%,Sn晶界浓度修正值为0.77at%;焊接线能量为60 k J/cm和100 k J/cm时,C-Mn-Sn钢中晶界的破坏使得由晶界偏聚和晶界Sn偏聚引起的脆化作用消失;在三种焊接线能量下,含Sn的C-Mn-Sn钢的显微硬度都要小于不含Sn的C-Mn钢。
文摘对C-Mn和C-Mn-Sn钢进行了焊接热模拟试验,研究了不同焊接线能量下Sn元素对建筑用钢显微组织、物相组成和韧-脆转变温度的影响,并分析了Sn的晶界偏聚行为及对焊接接头热影响区脆化作用的影响。结果表明,随着焊接线能量的增加,C-Mn和C-Mn-Sn钢的韧-脆转变温度都呈现为先增加而后降低的趋势;焊接线能量为36 kJ/cm时,Sn对焊接热影响区起到了明显的脆化作用,而在焊接线能量为60 kJ/cm和100 k J/cm时,Sn的存在并没有使焊接热影响区明显脆化;当焊接线能量为36 k J/cm时,C-Mn-Sn钢中Sn晶界浓度修正值为0.77at.%;焊接线能量为60 kJ/cm和100 kJ/cm时,C-Mn-Sn钢中晶界的破坏使得晶界偏聚和由晶界Sn偏聚引起的脆化作用消失;在三种焊接线能量下,含Sn的C-Mn-Sn钢的显微硬度都要小于不含Sn的C-Mn钢。
基金the National Key Research and Development Program of China(No.2017YFA0403803)the National Natural Science Foundation of China(Nos.52022017,51974058,51525401,51927801,81974325)+1 种基金the Science and Technology Commission of Shanghai Municipality,China(No.18ZR1428700)the Liaoning Revitalization Talents Program,China(No.XLYC1808005).
文摘The microstructural observation,the mass loss test,potentiodynamic polarization measurements and corrosion morphology examinations were conducted to study the influence of microstructural characteristics on corrosion behavior of Mg–5Sn–3In alloys in Hank’s solution after extrusion.The results show that the corrosion rate of the as-cast alloy is similar to that of as-extruded alloy;however,the local corrosion susceptibility is greatly weakened in the as-extruded alloy,especially in the extrusion direction.The relatively uniform corrosion morphology of the as-extruded alloy is attributed to refined Mg_(2)Sn particles,uniform distribution of Mg_(2)Sn particles and favorable crystal orientation.Meanwhile,the cytotoxicity tests confirm that the Mg–5Sn–3In alloy exhibits cytotoxicity of Grade 0−1 for NIH3T3 cells,suggesting an acceptable cytotoxicity of this alloy in the vitro assay.
基金supported by General Research Funds (Projects#115108 and#114809) from the Research Grants Council of the Hong Kong SAR,China
文摘The effect of Sn, Ca, Al, Si and Zn addition on the compressive strength of cast Mg-Sn-Ca （TX） alloys was studied in the temperature range of 25-250 °C and correlated with the microstructure. The Sn to Ca mass ratio up to 2.5 contributes to the formation of Mg2Ca phase at the grain boundaries and CaMgSn in the matrix, while a ratio of 3 gives only CaMgSn phase mostly in the matrix. While the compressive strength decreases with the increase in temperature, for Sn/Ca up to 2.5, a plateau occurs in 100-175 °C, which is attributed to the strengthening by Mg2Ca. However, for ratio of 3, the strength is lower and decreases more gradually. Mg-3Sn-2Ca （TX32） has the highest strength and the addition of 0.4%Al increases its strength but simultaneous addition of Si lowers the strength. Likewise, the addition of Zn improves its strength but simultaneous addition of Al slightly decreases the strength. The results are correlated with the types of intermetallic phases that form in various alloys.
