钢包精炼技术简述

作者从长期实践体会出发，简述了钢包精炼技术发展概况，主要方法的优缺点分析及其技术特点，钢包冶金学特点，并结合我国某些钢厂炉容量小的特点，提出粗略的建议，供参考。     

首饰用开金合金的研究与发展(2):首饰用开金合金的冶金学特性及强化机制

开金合金强度、硬度高，色彩丰富，可满足人们对首饰色彩多样性和饰品耐用性的要求，因而广泛用于首饰行业。作者综述了Au-Ag-Cu、Au-Ag-Pd和Au-Cu-Ni等首饰用主要合金系统的冶金学特性，重点评述了首饰用Au-Ag-Cu系开金合金的强化机制和强化途径的研究现状及发展，包括晶粒尺寸控制的强化、冷加工硬化、合金元素固溶强化、热处理强化以及微合金化强化等。     

2006年全国博士生学术论坛(冶金学科)暨首届中国高校冶金学院院长学术论坛

"2006年全国博士生学术论坛(冶金学科)暨首届中国高校冶金学院院长学术论坛"(以下简称"论坛") 于2006年10月14日-15日在东北大学召开.此次论坛由国务院学位委员会办公室和教育部学位管理与研究生教育司主办,东北大学承办,国家自然科学基金委工程与材料科学学部、辽宁省学位办、北京科技大学、中南大学、上海大学、昆明理工大学协办,是一次全国冶金学科博士生的学术盛会.     

Effects of cryogenic treatment on mechanical properties and microstructure of Fe-Cr-Mo-Ni-C-Co alloy

Fe-Cr-Mo-Ni-C-Co alloy was quenched in liquid nitrogen and held for 24 h. Hardness tester, OM, XRD, SEM were used to investigate the mechanical properties and microstructures of the alloy. The results show that the hardness increases by 1-2 （HRC） and the compressive strength decreases slightly after cryogenic treatment. The increase in hardness is attributed to the transformation from austenite to martensite and the precipitation of the very tiny carbide η-Fe2C. The decrease in compressive strength is caused by residual stress. The great amount of carbides, such as Cr7C3 and Fe2MoC, in the alloy and the obvious difference in thermal expansion coefficient between these carbides and the matrix at the cryogenic temperatures lead to this residual stress. The microscopy of cryogenic martensite is different from that of the non-cryogenic martensite. The cryogenic martensite is long and fine; while the non-cryogenic martensite is short and coarse. There is obvious surface relief of the cryogenic martensite transformation. It is not orientational of this kind surface relief and the boundary of this surface relief is smooth and in a shape of butterfly. The surface relief in the non-cryogenic martensite is wide and arranged in parallel, and the boundary of surface relief is not smooth. These characteristics may imply different growth ways of the two kinds of martensite.     

学者风采

刘竹林(1965-),男,湖南茶陵人,中共党员,教授,硕士,现任湖南工业大学冶金工程学院冶金工程系主任,国家级刊物《钢铁》杂志审稿专家。刘竹林教授1988年毕业于武汉科技大学材料与冶金学院,同年分配到江西新余钢铁     

关于基础研究与冶金工程结合的若干问题探讨

本文探讨了冶金科学基础研究的发展趋势和若干前沿问题．在当前国家经济转型过程中，我国冶金基础研究的主要任务是围绕国家目标，一方面是在前沿领域积极探索，加强创新和学科交叉，不断开拓和完善冶金科学的基本体系；另一方面是结合我国冶金工业的发展战略，就冶金新技术、新流程、矿产资源合理开发利用以及人类可持续发展等一系列重大问题抽提关键的科学问题开展应用基础性研究．     

The Influence of Carburizing Parameters on Carbon Transfer Coefficient

Definition of coefficient of carbon transfer in European Standard (EN 10052) is presented as: “Mass of carbon transferred from carburizing medium into the steel, per unit surface area per second for a unit difference between the carbon potential, and actual surface carbon content”.In this paper, a model is presented of carbon transfer from endothermic atmospheres to carbon steel. The carbon transfer coefficient values were determined experimentally by the foil technique and on specimens, taking into account the following parameters: chemical composition of atmospheres, carbon potential, temperature and time of the carburizing process. Some examples of the variation of the carbon transfer coefficient for two steps of the carburizing process,including soaking before quenching, are given, based on results obtained. The effect of carbon transfer coefficient on carbon content at the steel surface is given.     

Effects of oxygen potential and flux composition on dephosphorization and rephosphorization of molten steel

The dephosphorization experiments of low phosphorus containing steel by CaO-based and BaO-based fluxes were carried out. The effects of the oxygen potential in molten steel and the BaO content in the slag on dephosphorization and rephosphorization of molten steel were analyzed. The results showed that the dephosphorization ratio of more than 50% and the ultra-low phosphorus content of less than 0.005% in steel were obtained by the three kinds of dephosphorization fluxes as the oxygen potential of molten steel higher than 400×10-6. Rephosphorization of molten steel was serious as the oxygen content of molten steel lower than 10×10-6. BaO-based fluxes can improve the dephosphorization effect and reduce the phosphorus pick-up effectively under the condition of weak deoxidization of molten steel (the oxygen potential is about 100×10-6), but can not prevent rephosphorization under the condi- tion of deep deoxidization of molten steel (the oxygen potential less than 10×10-6).     

2006年全国博士生学术论坛（冶金学科）暨首届中国高校冶金学院院长学术论坛

“2006年全国博士生学术论坛（冶金学科）暨首届中国高校冶金学院院长学术论坛”（以下简称“论坛”）于2006年10月14日－15日在东北大学召开。此次论坛由国务院学位委员会办公室和教育部学位管理与研究生教育司主办，东北大学承办，国家自然科学基金委工程与材料科学学部、辽宁省学位办、北京科技大学、中南大学、上海大学、昆明理工大学协办，是一次全国冶金学科博士生的学术盛会。     

案例教学法在《钢冶金学》教学中的应用

针对钢冶金学课程的教学特点,探讨引入案例教学可行性。为使钢冶金学案例教学有效地实施,提出保证钢冶金学课程案例教学效果的措施,探讨在案例教学实施过程中所面临的主要障碍。