钢的显微组织对其土壤粘附特性影响的研究

本文对土壤粘附系统动态过程进行分析,并研究了钢中不同显微组织试样的粘附特性及其随土壤含水量、载荷、加载时间等因素变化的规律。结果表明,显微组织对粘附力有影响:马氏体低温回火与高温回火组织的粘附力较低,而中温回火组织的粘附力较高。

The Effect of Microstructure of Steel on Soil Adhesion Characteristics

The microstructure can obviously change the strength, toughness and free energy of steel. The principal materials of soil-engaging components of terrain machinery are ferrous metals,so studying effects of microstructure of steel on soil adhesion characteristics has practical significance in aspects such as choosing optimum microstructure,scheming out strengthening processes and developing the technique of reducing adhesion.The dynamic process of the soil adhesion system is analyzed in this paper, and the redistribution of soil particles and water content in the dynamic adhesive process between the moisture adhesive soil and the surface of the metal is described. The practical interface water content in the adhesive system,the constitution of soil surface layer and the microstructure of the metal surface are considered to be main factors affecting the adhesive force. By means of regression design method, soil adhesion characteristics of specimens with different microstructure are studied under different soil water content, loading force and length of time to keep load conditions. The results show that there do exist effects of microstructure of steel on soil adhesion characteristics. The adhesion values for low or high temperature tempered martensite are lower, but for that tempered in the intermediate temperature range is higher.In the present paper, a concept of effective Aispersity is put foreword, then the test results are reasonably explained with alterations of free energy and effective dispersity.