任学冲
金属学报
研究了车轮钢中白点和原子氢对冲击韧性和疲劳性能的影响。结果表明，可扩散氢浓度较低时（C0≤0.7×10-6），氢对冲击韧性没有影响。白点降低冲击韧性并且使冲击韧性值的波动范围增加。当试样中氢浓度较低（C0≤0.7×10-6）时，原子氢对车轮钢的疲劳性能没有影响。当氢浓度较高（C0≥2.5×10-6）时，氢能促进疲劳裂纹的形核和扩展。试样中的白点能增加疲劳裂纹扩展速率，并且使疲劳裂纹扩展速率发生明显的波动。
关键词:
车轮钢
,
flake
,
atomic hydrogen
,
impact toughness
,
fatigue
冼爱平
,
李培基
,
陈文绣
,
王仪康
,
陈仁义
,
梅东生
金属学报
用石腊油法测定了U71Mn重轨钢初轧坯中的可扩散氢和氢在钢中的扩散系数,并通过解剖经过堆垛缓冷的初轧坯,测定氢在断面上的分布结果表明,重轨钢坯中的氢绝大部分均为可扩散氢,室温下氢在U71Mn钢坯中扩散系数为(0.85—1.02)×10~(-6)cm~2/s初轧坯经堆冷后,含氢量大幅度下降,它有助于形成攀钢重轨无白点现象.
关键词:
U71Mn重轨钢
,
hydrogen
,
diffusion
,
flake
刘成
贵金属
doi:10.3969/j.issn.1004-0676.2009.04.006
将自制的球形超细铜粉,通过球磨改性成为片状铜粉,同时进行化学还原和铜离子萃取,在银氨溶液中置换镀银,使银均匀地沉积在铜的表面,并借助球磨的机械作用使镀层更紧密,包覆更完全.该工艺过程简单,可兼顾成本和性能两方面要求,可一次性制备高性能、低成本的片状镀银铜粉.
关键词:
金属材料
,
镀银铜粉
,
片状
,
萃取
,
抗氧化性
,
导电性
范俊锴
,
杜凤山
,
黄华贵
,
李杰
,
李源
钢铁
从Sieverts定律和微孔隙中分子氢和钢内溶解氢化学势平衡的理论基础出发,介绍了目前已有的几种钢内微孔隙氢压强度和氢浓度计算模型.通过对比找出了最适合应用的微孔隙氢压强度计算模型,并建立了新的微孔隙氢浓度计算模型.最后建立了钢内微孔隙氢压强度和氢浓度综合计算模型,证明了温度和孔隙率对微孔隙内氢压强度和氢浓度的重要影响.所建模型和分析结果为深入研究钢内白点的萌生扩展机制奠定了基础.
关键词:
微孔隙
,
氢压强度
,
氢浓度
,
计算模型
,
白点
XIAN Aiping LI Peiji CHEN Wenxiu WANG Yikang Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
ChinaCHEN Renvi MEI Dongsheng Panzhihua Institute of Iron and Steel Research
,
Ministry of Metallurgical Industry
,
Panzhihua
,
China associate professor
,
Institute of Metal Research
,
Academia Sinica
,
Shenyang 110015
,
China
金属学报(英文版)
The determination of dffusible hydrogen in U71Mn heavy rail steel,and hydrogen diffusivity as well as the hydrogen distribution in the cross section of blooms with stack cooling were stu- died.The results showed that,most of the hydrogen in blooms of heavv rail steel is diffusible, the hydrogen diffusivity in U71Mn rail steel blooms at room temperature is(0.85—1.02)× 10~(-6)cm~2/s,after stack cooling,the hydrogen content in bloom will decrease greatly which is helpful to form the flake-free phenomenon in the heavy rail produced by Panzhihua Iron and Steel Company.
关键词:
rail steel
,
null
,
null
,
null
XIAN Aiping LI Peiji CHEN Wenxiu WANG Yikang Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
ChinaCHEN Renyi MEI Dongsheng Panzhihua Institute of Iron and Steel Research
,
Panzhihua
,
China associate professor.Institute of Metal Research
,
Academia Sinica
,
Shenyang 110015
,
China
金属学报(英文版)
At panzhihua Iron and Steel Company,hydrogen content in molten heavy rail steel is rather low during smelting in the oxygen top-blown converter,and sloightly increases in tapping and pouring.Average H content varies from 2.0(dry season)to 2.4 ppm(rainy season)at smelt- ing end;2.8 ppm in ladle;and 2.1 ppm(dry season)to 2.3 ppm(rainy season)in mould, which is on a level with RH vacuum circle.The low hydrogen content in molten steel,which is due to both the very dry climate in Panzhiihua region and the LD smelting process,is the main reason why there is little flake in the heavy rail produced by Panzhihua Iron and Steel Com- pany.
关键词:
smelting
,
null
,
null
,
null
,
null
