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生产试验表明;Bi在铸铁中是一种强烈的促成碳化物元素.宏观上,增加白口区,减小麻口区,白口与灰口层之间界线清晰;微观上,增加白口区碳化物数量,改善其形态和分布,提高组织结构均一性,很好地控制硬质相的大小和分布,从而获得耐磨性与韧性的良好结合.在试验的基础上,提出了一种冷激铸铁合理的组织结构.用该材料制造的挺柱,在695Q高速增压柴油机(2800转/分)高接触应力(870兆帕)的挺柱——凸轮摩擦付中,耐久性台架试验600小时,挺柱摩擦表面光洁,无剥落划伤,未见明显磨损,证明耐磨性好,可靠性高,产成本低,是一种新型的耐磨材料,并具有显著的技术经济效果.
Production tests show that Bi is a strong promoter of carbides in cast iron.Macroscopically, the increase of white area and the decrease of hemp area, the clear boundary between white and gray layers; The amount of carbides to improve its morphology and distribution, improve the uniformity of the structure and control the size and distribution of the hard phase, so as to obtain a good combination of wear resistance and toughness.Based on the test, a cold Cast iron reasonable structure .Thick made with this material, in the 695Q high-speed supercharged diesel engine (2800 rev / min) high contact stress (870 MPa) Tappet - cam friction pay, durability bench test 600 hours, tappet friction surface smooth, no flaking scratches, no obvious wear and tear, proof wear resistance, high reliability, low cost, is a new type of wear-resistant materials, and has significant technical and economic results.