中高碳钢冷蚀低倍检验与质量改善

为了改进中高碳钢的铸坯质量，研究了一种专门的冷蚀检验操作法，可以清楚地显示中高碳钢低倍结构和缺陷，其检验结果可用来指导调整铸造工艺，从而改进铸坯质量。     

Formation of Reversed Austenite in High Temperature Tempering Process and its Effect on Mechanical Properties of Cr15 Super Martensitic Stainless Steel Alloyed with Copper

Formation mechanism of the reversed austenite of Cr15 super martensitic stainless steel (SMSS) alloyed with copper after high temperature tempering was investigated by means of thermo‐calc software, transmission electron microscope (TEM), and X‐ray diffraction (XRD). The mechanical properties of the SMSS were also tested. The experimental results show that the reversed austenite with low dislocation density is formed at high temperature tempering processing. The transformation of the martensite to reversed austenite is a diffused phase transformation, and the growth of the reversed austenite is closely related to the diffusion process of Ni. The bulk reversed austenite with large amount of stacking faults is formed with the increase of the tempering temperature. The volume fraction of reversed austenite increases at first and then decreases with increasing tempering temperature, and the maximum amount of the reversed austenite is obtained at 650°C. The reversed austenite is unstable at the tempering temperature above 650°C and the martensitic phase transformation will occur at the following cooling process. The mechanical properties of Cr15 super martensitic stainless steel are significantly influenced by the volume fraction of reversed austenite.     

高强高韧钢中奥氏体相电子结构的计算及其合金化行为

在紧束缚框架下用Ｒｅｃｕｒｓｉｏｎ方法计算了高强高韧钢中奥氏体相的电子结构,计算了替位和间隙固溶元素的局域态密度（ＬＤＯＳ）。通过总态」密度（ＴＤＯＳ）的积计算了体系的结果能及原子间的键级积分,讨论了闰和间隙固溶元素对合金钢奥氏体相物理性能的影响。     

大跨度钢结构桁架整体拼装施工双机抬吊技术

包头国际体育会展中心是由钢结构和混凝土结构相结合的混合结构,结构复杂、施工难度大、质量要求高。文章针对性的阐述了钢桁架整体拼装施工双机抬吊整体安装关键技术的施工,此方法在实践中取得了良好的效果。     

钢结构卷板机机架的应用设计

西安建筑科技大学粉体工程研究所成功地开发了一台卷板机,该卷板机机架采用全焊钢结构代替了传统的铸造结构。利用有限单元法中的板壳计算程序单元求得了该支架在使用条件下的应力和形变。数值模拟结果表明该支架完全满足生产工艺要求,这台卷板机已在工程实践中成功地应用。     

提高低合金高强度钢强韧性的措施

本文通过对提高低合金高强度钢强韧性措施的探讨，结合舞钢的具体生产情况，提出了提高低合金高强度钢强韧性的工艺方法。     

浅析高原地区门式钢构设计若干问题

由于高海拔地区特殊的自然气候条件和地理环境,在这些地区的门式刚架轻钢结构设计中有一些问题或细节容易被忽视.本文针对问题从结构材料的选用、相关数据及系数的调整、结构体系的构造措施以及钢构件的防腐要求等方面入手确保门式刚架轻钢结构的设计合理、经济、安全.     

应用BP网络建立新型高强韧钢的结构形成因子与抗拉强度的关系

根据固体与分子经验电子理论计算了19组新型高强韧钢的试验数据所对应的结构形成因子S值,从中随机抽取16组数据,应用人工神经网络的BP结构进行训练,用其余3组数据进行检验,其平均训练误差为0．8731％,平均检验误差为0．9657％,建立了价电子结构与强度这间的定量关系,为从电子层次进行合金成分设计进行了有益的尝试。     

热变形后的冷却速度对高碳铬铸钢组织和性能的影响

研究了经40％热变形后不同冷却速度下高碳铬铸钢的组织和性能。结果表明：热变形后的冷却速度与组织及性能有良好的对应关系。高碳铬铸钢变形后风冷（冷却速度约7℃／s）时，其综合力学性能最好。     

Analysis of High Temperature Deformed Structure and Dynamic Precipitation in W9Mo3Cr4V Steel

In recent years,high temperature deformationand recrystallization have been commonly studied incarbon and low alloy steels[1— 6] .Ref. [3]and Ref.[6 ]have investigated the behavior of hightemperature deformation and recrystallization inhigh speed steels. Using TEM and SEM,variousdeformed structures and sub- structures,dynamicrecrystallized nuclei and dynamic precipitation inW9Mo3Cr4 V steel were studied.1　 Experimental Procedure1.1　 Sample preparation　　 The material used is a commer…