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研究亚显微晶粒的普通碳素钢(1.3％C和1.6％C)在热处理后的机械性能、指出这种钢经奥氏体化后淬火能得到高硬度(Rc=67)、高压缩断裂强度(4345Mpa约630干磅/吋~2)及良好的压缩延性(约10％)。这些优良的特性是通过低温奥氏体化得到的。在淬火前用低温奥氏体化加热能得到细小的奥氏体晶粒,相反,高温奥氏体化则导致断裂强度降低,这是因为转变产物粗化造成的。经低温奥氏体化淬火后,试样的显微组织是隐针马氏体和未溶渗碳体,而透射电子显微镜研究表明,其组织大部份是亚显微的板条马氏体、少量很细小的孪晶马氏体区和末溶渗碳体质点。
The mechanical properties of sub-microtest ordinary carbon steels (1.3% C and 1.6% C) after heat treatment were investigated. It is pointed out that the austenitizing quenching of this steels gives a high hardness (Rc = 67) Breaking strength (4345Mpa about 630 dry pounds / inch ~ 2) and good compressive ductility (about 10%). These excellent properties are obtained by austenitizing at low temperatures. Prior to quenching with austenitizing low temperature austenite can be obtained fine austenite grain, on the contrary, the high temperature austenitizing the rupture strength decreases, it is due to the transformation of the product caused by coarsening. After low-temperature austenitizing quenching, the microstructure of the sample is hidden martensite and undissolved cementite, and transmission electron microscopy studies show that most of its organization is sub-microscopic lath martensite , A small amount of very small twin martensite area and the end of insoluble cementite body point.