搬手头淬火开裂原因分析
Analysis of Quenched Cracking on Move-on-hand
白宝忠
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作者单位：陕西工业职业技术学院 设备科, 陕西 咸阳 712000
中文关键字：搬手头； 淬火裂纹； 弧形裂纹； 尖角效应； 应力集中
英文关键字：move-on-hand; hardening crack; arc-shaped crack; acute angle effect; stress concentration
中文摘要：通过宏观检验、微观检验、显微硬度测定及化学成分分析等方法，对45钢搬手头产生裂纹的原因进行分析。结果表明，搬手头内六方处的裂纹，是尖角效应引起应力集中而产生的应力集中裂纹；垂直于轴线的裂纹是因为淬火快速冷却时，厚壁处未淬透以及截面尺寸突变产生的弧形裂纹。
英文摘要：Through macroscopic methods, microscopic examination, micro hardness measurement and chemical composition analysis, the reason of quenched crack of 45 steel move-on-hand was analyzed. The results show that the crack of the department within the six-party of the move-on-hand is caused by stress concentration on the acute angle effect. Crack perpendicular to the axis is caused on too rapid quench cooling, non-hardenability of the thick-walled department, as well as mutation of cross-section size. This is a typical arc-shaped crack.