摘要
设计了一种输送叶片耐磨块用中碳Cr-Mn-Si低合金耐磨铸钢，开展了不同工艺的热处理研究，并进行了显微组织分析、硬度及冲击韧性测试。结果表明：通过计算，此钢的奥氏体开始转变温度为780℃，完全转变温度为820℃；在850-930℃内进行水淬或油淬，可以得到回火马氏体和残余奥氏体组织，随着淬火温度的升高，钢的硬度增大，当淬火温度高于880℃时，其硬度趋于平衡值，当淬火温度高于910℃时，其冲击韧性急剧降低。
A medium carbon Cr-Mn-Si low alloy wear resistant cast steel which is applied to transportation blade was designed. Researches on the heat treatment process of the steel were investigated, and microstructure analy- sis, hardness tests and impact toughness were also carried out. The results showed that the beginning austenization temperature was calculated to be 780 ℃, and the finishing temperature was 820 ℃. After being water or oil quenched at the temperature of 850-930 ℃, then the steel consisted of tempered martensite and retained austenite microstructure was obtained. With the increasing of the quenching temperature, the hardness of the steel will increase. But when the quenching temperature is higher than 880 ℃, the hardness tends to a balanced value, while the quenching temperature is higher than 910 ℃, the impact toughness decreases dramatically.
基金
国家自然科学基金(51401077)
河南省博士后基金(2012052)
关键词
中碳Cr-Mn-Si低合金耐磨铸钢
热处理
硬度
冲击韧性
medium carbon Cr-Mn-Si low alloy wear resistant cast steel, heat treatment, hardness, compact toughness
