ABSTRACT The present study provides evidence for the role of ferrite-grain-size distributions on the occurrence of void initiation in a low-carbon steel. Various thermomechanical treatments were undertaken to create ultrafine, bimodal and coarse distributions of ferrite grain sizes. A two-parameter characterisation of probable void initiation sites is proposed, namely an elastic modulus difference and a difference in Schmid factor of the grains surrounding the void. All microstructures were categorised based on the ability to facilitate or resist void nucleation. For coarse grains, the elastic modulus and the Schmid factor differences are the highest, while they are intermediate for ultrafine grains and the lowest for the bimodal microstructure.

中文翻译：

---

晶粒的弹塑性相容性对低碳钢中空洞形成标准的影响

摘要 本研究为铁素体晶粒尺寸分布对低碳钢中空洞产生的作用提供了证据。进行了各种热机械处理以产生铁素体晶粒尺寸的超细、双峰和粗分布。提出了可能的空隙起始位点的两个参数表征，即空隙周围晶粒的弹性模量差异和 Schmid 因子差异。所有微观结构都根据促进或抵抗空隙成核的能力进行分类。对于粗晶粒，弹性模量和 Schmid 因子差异最大，而对于超细晶粒，它们介于中间，对于双峰显微组织最低。