论文部分内容阅读
一、前言 4Cr5MoVSi(H_(11))钢具有良好的高温强度和韧性,是国外应用比较广泛的热模具钢,国内已推广使用了几年,并取得了良好的效果。该钢的常规组织为淬火马氏体,但由于随模具的截面尺寸增大,淬火时心部冷却速度降低,致使碳化物沿晶界析出和有贝氏体组织形成,直接影响了回火后的硬度和冲击值,有关这方面的工作,目前国内报导得不多。本文研究了4Cr5MoVSi钢在不同淬火冷却速度下马氏体、贝氏体和珠光体对硬度强度和冲韧击性的影响,为合理使用4Cr5MoVSi钢和制定最佳淬火工艺提供依据。二、试验材料及试验方法 1.试验材料试验用4Cr5MoVSi钢是抚顺钢厂5t电弧炉冶炼,铸成1t钢锭,热轧成φ80棒材。
First, the preface 4Cr5MoVSi (H_ (11)) steel has good high temperature strength and toughness, is widely used abroad hot die steel, the domestic has been promoting the use of a few years, and achieved good results. The conventional structure of the steel is quenched martensite. However, as the cross-sectional dimension of the mold increases, the cooling rate of the heart decreases when the mold is quenched, resulting in the precipitation of carbides along the grain boundaries and the formation of bainite structure, which directly affects the tempering The hardness and impact of the value of the work in this regard, the current domestic reports are limited. In this paper, the effects of martensite, bainite and pearlite on the hardness and punch toughness of 4Cr5MoVSi steel at different quench cooling rates were studied. The results provide the basis for the rational use of 4Cr5MoVSi steel and the development of the optimal quenching process. Second, the test materials and test methods 1. Test Materials Test 4Cr5MoVSi steel is 5t Fushun Iron Furnace smelting, cast 1t ingot, hot-rolled into φ80 bar.