赵新凯 李刚利 刘西峰
物理测试
近几年冷轧带钢的质量异议绝大多数都集中于表面缺陷问题，冷轧带钢表面缺陷形态千变万化，产生原因错综复杂，炼钢、热轧、冷轧之间各工序都可直接或间接造成表面缺陷的产生。本文对唐山建龙实业有限公司冷轧厂低碳铝镇静钢的表面起皮缺陷进行了较为全面的分析。结果表明表面起皮缺陷的原因归结于皮下夹杂和皮下气泡。笔者认为各工序只有正确识别各种缺陷，加强对缺陷的检测和分析，找到问题的根源，采取相应的措施，才能改善产品质量。
关键词:
冷轧
,
defect
,
inclusion
,
bubble
吕凤军
,
傅国如
物理测试
通过断口分析、X射线能谱分析、硬度及金相检验等试验方法，对油门停车限动卡弹簧的断裂进行了综合分析，结果表明：该弹簧断裂失效性质为疲劳断裂；弹簧钢丝冷拉时表面产生的微裂纹缺陷是导致弹簧断裂的根本原因；此次弹簧断裂为一次偶发性个案，不具备批次性问题。
关键词:
弹簧
,
fatigue
,
defect
DENG Wen XIONG Liangyue LONG Qiwei International Centre for Materials Physics
,
Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
ChinaWANG Shuhe GUO Jianting Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
China Institute of Metal Research
,
Academia Sinica
,
Shenyang 110015
,
China
金属学报(英文版)
The behuviour of B atoms added to mono-and poly-crystalline Ni_3AI alloys has been investi- gated hy positron annihilation technique(PA T).If the additive of B was less than 1.37 at-%, some of B atoms solid-solutioned interstitially into matrix and distorted the lattice,thus the lifetime (τ) of positron (e~+) Or matrix dilated:the others of them segregated on vacancy-like defects and formed "filling effect",thus the mean lifetime (τ)and S parameters decreased.If B added was increased up to 2.22 at-%,more defects having larger free volume were induced by horide eutectic occurred along grain boundaries and grain interior,thus the τ in vacancy-like defects.τ and S parameters increased remarkably.
关键词:
Ni_3Al
,
null
,
null
,
null
XU Haigang ZHU Jing YUAN Hong Central Iron and Steel Research Institute
,
Ministry of Metallurgical Industry
,
Beijing
,
ChinaNING Xiaoguang YE Hengqiang Laboratory of Atomic Imaging of Solids
,
Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
China
金属学报(英文版)
The morphology,crystal defects and chemical compositions of surfaces in two kinds of SiC whiskers related to their growth mechanism have been studied by means of electron microscopy and surface chemical analyses.Based upon the experimental results,five criteria for evaluating the whisker microstructure were suggested as:proportion of the perfect single crystals,morphology and dimensions,defects and their distribution,the bulk and surface chemistries,and crystallographic characteristics.
关键词:
SiC
,
null
,
null
,
null
