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热处理能明显改善球墨铸铁(以下简称球铁-译注)的性能,获得等温淬火球铁(ADI)。通过渗硼形成高硬度(2 100 HV)的渗层能进一步提高性能。本文研究用球铁含有合金元素铜、铜-镍和铜-镍-钼,在850℃、900℃和950℃的盐浴(硼砂+铝)中渗硼2 h和4 h,然后将试样直接从渗硼温度在240℃、300℃和360℃的盐浴中等温淬火(渗硼-等温淬火),渗硼后不需要为了等温淬火而再次奥氏体化加热。渗硼层均匀,厚度35~130μm,硬度1 300~1 700 HV。
Heat treatment can significantly improve ductile iron (hereinafter referred to as ductile iron - transliteration) performance, get isothermal quenched ductile iron (ADI). Boronization to form high hardness (2,100 HV) layer can further improve performance. In this paper, the ductile iron containing boron alloyed copper, copper-nickel and copper-nickel-molybdenum was cast for 2 h and 4 h in salt bath (borax + aluminum) at 850 ℃, 900 ℃ and 950 ℃, Austempering (boronizing-isothermal quenching) directly from the boronizing bath at 240 ° C, 300 ° C and 360 ° C does not require austenitizing heating for the isothermal quenching after boronizing. Boride layer evenly, the thickness of 35 ~ 130μm, hardness 1 300 ~ 1 700 HV.