我們知道,在熱處理(淬火)過程中,往往容易引超裂紋而使加工好了的机件成為廢品。這種疵病給我們生產工作帶來很大的損失;因此,研究引起淬裂的原因,对於实際工作有很大的意义。經蘇聯学者多次試验結果證明了淬火後產生裂紋的原因,是由於工件表面有抗拉應力存在的緣 We know that in the heat treatment (quenching) process, it is often easy to induce super cracks and the machined parts become waste products. This kind of illness has brought great losses to our production work; therefore, studying the causes of quenching and cracking is of great significance for practical work. The results of several experiments by Soviet scholars have proved that the reason for cracking after quenching is due to the presence of tensile stress on the workpiece surface.