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| 提高汽车车身电阻焊电极屈服强度的研究 |
| Study on Increasing the Yield Strength of Autobody Resistance Welding Electrode |
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| DOI：10.3969/j.issn.1671-5322.2004.01.009 |
| 中文关键词: 屈服强度 电极 平面应变 塑性变形 切应力 |
| 英文关键词: yield strength electrode plane strain plastic deformation shearing stress |
| 基金项目: |
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| 中文摘要: |
| 研究了电阻焊电极合金经93K低温处理后晶粒细化对高温屈服强度的影响.研究结果表明:增加单位体积的晶界数量,即增加单位体积的晶界能,能提高电极合金的塑性变形阻力.电极承载时,近似平面应变,符合Brinell硬度试验的HB/Y≈2.8～2.9关系式.单位体积内晶界数量增多,意味着合金固溶体在切应力作用下滑移阻力增大,这可用Hall-Patch的关系式给予解释. |
| 英文摘要: |
| The influence of resistance welding electrode alloy’s grain refined after 93K cryogenic treatment to high temperature yield strength is studied in this paper. Study result indicates : adding the crystal boundary amount of unit volume, i.e. adding the crystal boundary energy of unit volume, can increase plastic deformation resistance of electrode alloy. When electrode is loaded, it approximates to plane strain and accords with the Brinell hardness test’s relational expression(HB/Y≈2.8～2.9). The addition of crystal boundary amount in unit volume predicates alloy solid solution’s slip resistance added by the action of shearing stress. It can explain with Hall—Patch relational expression(σ s=σ 0+K yd -1/2). |
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