TIG welding was used to deposit Co-8.8 Al-9.8 W-0.2 B superalloy on 304 austenite stainless steel. The form factor of weld, dilution ratio, microhardness, microstructure and distribution of alloying elements were inve...TIG welding was used to deposit Co-8.8 Al-9.8 W-0.2 B superalloy on 304 austenite stainless steel. The form factor of weld, dilution ratio, microhardness, microstructure and distribution of alloying elements were investigated. The microstructure of cladding layer was mainly hypoeutectic. The primary phases were cobalt-rich solid solution. The eutectic phase was composed of cobalt-rich solid solution,Co6W6C and Co Cx. When the boron content increased from 0.2% to 0.5%,the dilution ratio decreased,the primary phase became coarse and the microhardness decreased. When the boron content was from 0.5% to 2%,the dilution ratio and microhardness increased obviously,but the primary phase was refined.The hard phase of Co-8.8 Al-9.8 W became refined and the amount was raised,and the performance of cladding layer was improved with appropriate boron increase.展开更多
为探究锌锰硼配施对雪茄烟叶矿质元素含量变化及其与干物质积累间的关系,本试验以德雪1号为试材,设置叶面喷施7.5 g ZnSO_(4)+10 g MnSO_(4)+7.5 g硼砂(T1,666.7m^(2)用量,下同)、10 g ZnSO_(4)+10 g MnSO_(4)+7.5 g硼砂(T2)、10 g ZnSO...为探究锌锰硼配施对雪茄烟叶矿质元素含量变化及其与干物质积累间的关系,本试验以德雪1号为试材,设置叶面喷施7.5 g ZnSO_(4)+10 g MnSO_(4)+7.5 g硼砂(T1,666.7m^(2)用量,下同)、10 g ZnSO_(4)+10 g MnSO_(4)+7.5 g硼砂(T2)、10 g ZnSO_(4)+15 g MnSO_(4)+10 g硼砂(T3)、15 g ZnSO_(4)+15 g MnSO_(4)+10 g硼砂(T4)和清水(CK)共5个处理,研究其对雪茄烟矿质元素含量动态变化和干物质积累的影响,并分析全生育期内烟叶矿质元素间及其与干物质积累间的相关性。结果表明,生育期内,随着锌锰硼配施量的增加,雪茄烟叶Fe含量呈先降低后升高再降低趋势,其余10种元素含量和干物质积累量均呈先增加后降低趋势,尤以T2处理含量最佳,干物质积累量最大。随生育进程,不同处理叶片P、Ca、Zn、Fe含量先升后降,N、Na含量先降后升;K含量总体呈下降趋势,而Mg含量呈先升后降再升高并趋于平稳变化趋势;生育期内Cu、Mn、B含量呈波浪状变化。叶片中N与P、K元素间存在协同增效机制,Ca、Mn元素可促进Mg、Zn、B、Na的吸收;而Fe与Ca、Zn、Mn及B与Cu、Fe间存在拮抗作用。全生育期内叶片中P、Mg、Mn、Na含量与干物质积累量间存在显著或极显著正相关。综合来看,锌锰硼肥配施可促进雪茄烟叶矿质元素的吸收和积累,提高烟株干物质积累量,666.7m^(2)以10 g ZnSO_(4)+10 g MnSO_(4)+7.5 g硼砂配施效果最好。展开更多
基金supported by the National Natural Science Foundation of China(Grant No.51561019)
文摘TIG welding was used to deposit Co-8.8 Al-9.8 W-0.2 B superalloy on 304 austenite stainless steel. The form factor of weld, dilution ratio, microhardness, microstructure and distribution of alloying elements were investigated. The microstructure of cladding layer was mainly hypoeutectic. The primary phases were cobalt-rich solid solution. The eutectic phase was composed of cobalt-rich solid solution,Co6W6C and Co Cx. When the boron content increased from 0.2% to 0.5%,the dilution ratio decreased,the primary phase became coarse and the microhardness decreased. When the boron content was from 0.5% to 2%,the dilution ratio and microhardness increased obviously,but the primary phase was refined.The hard phase of Co-8.8 Al-9.8 W became refined and the amount was raised,and the performance of cladding layer was improved with appropriate boron increase.
文摘为探究锌锰硼配施对雪茄烟叶矿质元素含量变化及其与干物质积累间的关系,本试验以德雪1号为试材,设置叶面喷施7.5 g ZnSO_(4)+10 g MnSO_(4)+7.5 g硼砂(T1,666.7m^(2)用量,下同)、10 g ZnSO_(4)+10 g MnSO_(4)+7.5 g硼砂(T2)、10 g ZnSO_(4)+15 g MnSO_(4)+10 g硼砂(T3)、15 g ZnSO_(4)+15 g MnSO_(4)+10 g硼砂(T4)和清水(CK)共5个处理,研究其对雪茄烟矿质元素含量动态变化和干物质积累的影响,并分析全生育期内烟叶矿质元素间及其与干物质积累间的相关性。结果表明,生育期内,随着锌锰硼配施量的增加,雪茄烟叶Fe含量呈先降低后升高再降低趋势,其余10种元素含量和干物质积累量均呈先增加后降低趋势,尤以T2处理含量最佳,干物质积累量最大。随生育进程,不同处理叶片P、Ca、Zn、Fe含量先升后降,N、Na含量先降后升;K含量总体呈下降趋势,而Mg含量呈先升后降再升高并趋于平稳变化趋势;生育期内Cu、Mn、B含量呈波浪状变化。叶片中N与P、K元素间存在协同增效机制,Ca、Mn元素可促进Mg、Zn、B、Na的吸收;而Fe与Ca、Zn、Mn及B与Cu、Fe间存在拮抗作用。全生育期内叶片中P、Mg、Mn、Na含量与干物质积累量间存在显著或极显著正相关。综合来看,锌锰硼肥配施可促进雪茄烟叶矿质元素的吸收和积累,提高烟株干物质积累量,666.7m^(2)以10 g ZnSO_(4)+10 g MnSO_(4)+7.5 g硼砂配施效果最好。
文摘利用金相组织观察、冲击试验和热膨胀试验,研究了B元素含量变化对高强钢药芯焊丝焊缝金属中针状铁素体形成的影响,得到了不同试验温度下焊缝金属冲击吸收功.结合透射电镜分析和分级淬火试验从热力学和动力学的角度对B元素影响机理进行了分析.结果表明,焊缝金属组织晶界中含有自由状态的B元素具有抑制晶界铁素体形核利于针状铁素体生成的作用;N元素含量增加会降低晶界B元素含量,并提高奥氏体向铁素体转变的温度,减少针状铁素体含量;针状铁素体是在以Ti元素和Mn元素的氧化物为核心,以Cu元素和Mn元素的硫化物为外层,以BN为过渡层的复杂结构上形核并长大的;针状铁素体含量的增加有利于提高焊缝金属冲击吸收功,–60℃冲击吸收功最大为70 J.
