一、引言 由于粗大的魏氏组织常常和较高的奥氏体化温度及粗大的奥氏体晶粒联系在一起,尤其在过热或过烧(奥氏体化温度过高,晶粒更粗大)的情况下,钢材内更容易显现出魏氏组织,因此在较长的一段时期内,人们总是把钢材中出现魏氏组织和钢的过热联系在一起;由此联想到具有魏氏组织的钢材,其韧性必然变坏。有些作者亦从一定条件下的实验结果指出:钢材有魏氏组织时的性能比没有魏氏组织的要差。鉴于这种情 I. INTRODUCTION As the coarse Widman’s tissue is often associated with higher austenitizing temperatures and coarse austenite grains, especially overheating or over-burning (austenitizing temperature is too high, the grains are coarser ), Steel is more likely to show Widman’s tissue, so for a longer period of time people always associate Widman’s and steel overheating in the steel; thus associating with Widmanstatten Of the steel, the inevitable deterioration of its toughness. Some authors also pointed out from experimental results under certain conditions that the performance of steel with Widman’s tissue is worse than that without Widman’s tissue. Given this situation