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通过热处理改变低碳贝氏体钢中的奥氏体及其转变物(下称M/A)分布形态,调整钢响应载荷时的微观应力集中位置,并用弹塑性力学理论揭示了贝氏体钢较高的抗冲蚀磨损性能的力学机理.对比研究了相同化学成分贝氏体、珠光体和马氏体的冲蚀磨损性能,发现珠光体和马氏体因强度、韧塑性无法达到最佳匹配,其抗冲蚀磨损性能均不如贝氏体.在贝氏体钢中,粒状M/A贝氏体的应力集中位置使得冲蚀裂纹显著地向试样心部扩展,降低了抗冲蚀磨损能力.薄膜状M/A贝氏体的应力集中位置不利于表面裂纹向试样心部生长,实现了较高的抗冲蚀磨损性能.
By changing the distribution of austenite and its transformation (referred to as M / A) in low-carbon bainitic steel by heat treatment, the micro-stress concentration position of the steel in response to load is adjusted, and the bainitic steel High abrasion resistance of the wear mechanism.Comparison of the same chemical composition of bainite, pearlite and martensite erosion wear performance and found pearlite and martensite due to strength, toughness and plasticity can not achieve the best Match, its erosion wear resistance is not as good as bainite In bainitic steels, granular M / A bainite stress concentration position makes the erosion crack significantly extended to the heart of the sample, reducing erosion Wear ability.The stress concentration position of thin film M / A bainite is not conducive to the surface crack growth to the sample heart, achieving higher erosion wear resistance.