DYNAMIC MECHANICAL BEHAVIOURS OF HIGH Mo AUSTENITIC STAINLESS STEEL DURING HOT DEFORMATION

The dynamic mechanical behaviours of super low carbon high Mo austenitic stainless steel(00Cr20Nil8Mo6CuN)during hot deformation have been studied by using Formaster-Presshot working simulator. The hot deformation equation, as well as the relationship between peakstrain, peak stress and Zener-Hollman parameter, together with the deformation activationenergy have been resulted through the experiments.     

高炉型熔渣中TiO2的活度

在1500℃下用金属Sn作熔剂,石墨作还原剂,采用“熔渣—金属Sn”化学平衡法和相图计算法,得到了高炉型熔渣中TiO_2的活度,并讨论了渣中TiO_2的活度和活度系数随其浓度变化的规律。     

硼含量对FeCrMoSiB合金急冷态及退火态组织与性能的影响

本文研究了不同硼含量下FeCrMoSiB单辊急冷带及950℃退火带的显微组织及硬度和脆性。发现在B≤17％范围内,硼含量的增加提高非晶形成能力及抗晶化能力,但同时也增加其脆化倾向,非晶内部存在成分与结构的不均匀性。当B=20％时,非晶形成能力急剧下降,生成与(Cr,Fe)_2B结构相近的亚稳相。退火带由硼化物与α-Fe晶粒组成。硼化物有M_3B_2和(Cr,Fe)_2B两种,其中(Cr,Fe)_2B数量随硼含量线性增加而M_3B_2数量基本不变。     

KINETICS OF PHASE TRANSFORMATION FOR DEFORMED AUSTENITE TO PROEUTECTOID FERRITE

The volume fraction of proeutectoid ferrite transformed from deformed austenite fv as a func-tion of isothermal time t has been investigated in 0.037% Nb microalloyed steel.The resultsshow that lnln(1-fv)~(-1) vs Int relation does not follow the Avrami equation strictly and con-sists of two straight lines.By comparing the differences between the results and Cahn's theory,the authors' idea has been expounded.     

RELATIONSHIP BETWEEN M-A CONSTITUENT AND CLEAVAGE FRACTURE BEHAVIOUR OF GRANULAR BAINITIC WELD METAL

The cleavage fracture mechanism of granular bainitie weld metal in 15MnVN steel has beeninvestigated.SEM observation of a special specimen for revealing simultaneously fracture sur-face and microstructure shows that the cleavage of the weld is initiated by M-A constituent.The 95th percentile equivalent diameter of M-A constituent controls the cleavage fracturestress of the weld metal.     

钢渣处理在炼钢分厂的应用

文章简要分析了目前国内主要的钢渣处理工艺,介绍了天津铁厂炼钢钢渣处理工艺的设计思路和应用情况。并指出现有钢渣处理工艺存在的不足之处和改进方案。     

做好企业查新咨询工作为科研生产服务

介绍了开展企业科技查新咨询要做好三个方面的工作,重点阐述在提高查新工作质量上要注意的几点。     

钢锭车的改造

针对太钢初轧厂钢锭车在生产中存在的问题进行了分析,提出处理措施,并通过技术改造取得了较好的效果。     

45类钢变流的机理及防止

针对45类钢变流的问题，分析了浇注变流的机理，提出了解决与防止的方法，同时对防止其它钢种浇注变流提供了一个新思路。     

AN EMPIRICAL FORMULA OF STABILITY FOR PLATE ROLLING

A new empirical formula to calculate the optimum plate crown and roll camber wasderived as:y=(4P)/(a~2c)(x~2+(B/2)x)It was fairly verified by production practice.