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本文研究了三种中碳锰钢中不同程度的硫化锰夹杂和晶粒尺寸等冶金因素对材料裂纹扩展阻力特性的影响.结果表明:造成材料裂纹扩展阻力各向异性的主导因素是沿轧向分布的条片状硫化锰夹杂,而不是通常所认为的带状组织;随(高温正火)晶粒长大,材料纵、横向阻力经历了不同程度的降低并达到相近水平后,使得各向异性减弱或消失;不同程度的硫化锰夹杂使得裂纹扩展阻力曲线上下移动,而对阻力曲线的斜率无明显影响;晶粒粗大及晶间网状铁素体强烈降低材料的裂纹扩展阻力,并极易导致裂纹的失稳扩展.
In this paper, the effects of metallurgical factors such as MnS inclusions and grain size on the crack growth resistance of three kinds of medium carbon manganese steels were investigated. The results show that the dominant factor causing the crack growth anisotropy is the rolling resistance The distribution of strip manganese sulfide inclusions, rather than the band structure is generally considered; with (high temperature normalizing) grain growth, longitudinal and transverse resistance of the material has experienced varying degrees of reduction and reached a similar level, making the direction The opposite sex weaken or disappear; different levels of manganese sulfide inclusions make the crack growth resistance curve move up and down, but have no significant effect on the slope of the resistance curve; coarse grains and intergranular reticular ferrite strongly reduce the material’s crack propagation resistance, Easily lead to crack instability expansion.