Effect of heat treatment on the microstructure and hardness of C-Cr-W-Mo-V-RE Fe-based hardfacing layer

0IntroductionHot-rollers and scissors are the critical parts of thesteel rolling equipments.At present,the surface soften-ing,the early wearing and the tearing are the primary rea-sons for the lowservice life of the hot-rollers and scissors.Although hardfacing has been applied to repaire the partseasily being worn and torn,such as the hot-rollers and thescissors,and has been obtained economic benefits[1-3],this technology has common problem:if the hardfacing lay-er contains more excessive allo…     

晶化机制与激活能的晶化速率参比法确定

本文根据修正的Kissinger公式提出一种确定非晶材料晶化机制与激活能的最大晶化速率参比法。以Ar_(70)Cu_(30)非晶合金为例,研究了晶化机制与激活能及其与压力的关系。     

40Cr钢渗氮过程中碳原子的迁移

将正火４０Ｃｒ钢样在不同温度下进行不同时间的气体渗氮，对其横断面进行波谱分析，发现渗氮前沿附近自始至终存在着典型的贫碳区，其两侧为富碳区，透射电镜分析结果表明，碳原子的重新分布包括碳化物的回溶、碳的扩散及碳化物长大三个过程。     

淬火介质SST101在调质钢及轴承钢热处理中的应用

本文研究了调质钢４０Ｃｒ，３５ＣｒＭｏ和轴承钢ＧＣｒ１５在淬火介质ＳＳＴ１０１中淬火后的淬透性、变表开裂性及４０Ｃｒ的力学性能。实验结果表明：适当调整ＳＳＴ１０１的浓度，可以获得不同的冷却速度；适合调质钢４０Ｃｒ，３５ＣｒＭｏ及轴承钢ＧＣｒ１５的淬火液的最佳浓度分别为１．０％－１．５％和１．５％－２．０％。     

影响淬火剂SST101冷却特性因素的研究

本文对淬火剂ＳＳＴ１０１在其不同的浓度、温度及重复使用次数下冷却曲线进行测定，试验结果表明，温度、重复使用次数对其冷却特性均有影响，且随其深度增大、温度升高、重复次数增多，其冷却能力降低。     

CORROSION FAILURE ANALYSIS OF FLAME SPRAYED Zn-A115 COATING IN SEA WATER

The morphology,microstructure,chemical composition and electrochemical behavior of theflame sprayed Zn-Al15 coating after corrosion test in sea water have been investigated.Theresults show that the selective dissolution of the laminar euteetic structure of the Zn-AI15coating is the fundamental cause for its similarity in electrochemical behavior with Zn coatingand kinetic behavior with Al coating.In the beginning period of sea water corrosion,the com-bined action of the laminar eutectic structure of the coating together with the residual stressmay induce the stress corrosion cracking of the coating,and result in the crevice corrosion.The coating then will bulge and.fail in local areas due to embrittlement itself,stacking and ex-pansion of corroded products under the residual stress.     

Investigation on SPF/DB Procesing of Zincified Alloy LY11

ＩｎｖｅｓｔｉｇａｔｉｏｎｏｎＳＰＦ／ＤＢＰｒｏｃｅｓｉｎｇｏｆＺｉｎｃｉｆｉｅｄＡｌｏｙＬＹ１１ＧａｏＳｈｉｙｏｕ，ＬｉａｏＢｏ，ＣｈｅｎＭｉｎｚｉ，ＮａＲｉｓｏｎｇａｎｄＺｈａｎｇＣｈｕｎｌｉｎｇ（高士友）（廖波）（陈闽子）（娜日松）（张春玲）Ｙ...     

不同压力温度条件下聚合的Si-Ni-B中介聚晶金刚石(PCD)抗压强度及组织特征研究

在一系列高温超高压条件下,制备了Si-Ni-B中介结合的聚晶金刚石(PCD),用压缩试验、X射线衍射分析、SEM、金相分析研究了PCD聚合的温度、压力条件对其抗压强度及组织特征的影响。