改善中碳Cr-Mn-Si钢淬透性的合金化研究  

Investigation on alloying to improve hardenability of medium carbon Cr-Mn-Si steel

作　　者：张显武 丁雅莉[2] 杨卓越[2] 高齐[2] 王胜民[1] Zhang Xianwu;Ding Yali;Yang Zhuoyue;Gao Qi;Wang Shengmin(Faculty of Material Science and Engineering,Kunming University of Science and Technology,Kunming Yunnan 650093,China;Research Institute of Special Steels,Central Iron&Steel Research Institute Co.,Ltd.,Beijing 100081,China)

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]钢铁研究总院有限公司特殊钢研究院,北京100081

出　　处：《金属热处理》2023年第1期112-115,共4页Heat Treatment of Metals

摘　　要：借助于传统的末端淬火试验方法研究了添加Mo、Mo+B和Mo+Ni对改善中碳Cr-Mn-Si钢淬透性的有效性。结果表明,中碳Cr-Mn-Si钢及分别添加Mo、Mo+B和Mo+Ni时形成粒状贝氏体相变倾向较大,端淬试样空冷端即形成粒状贝氏体,因此端淬曲线上无法得到符合SAE J406标准的理想临界直径(DI)等淬透性定量信息。然而,端淬曲线的硬度与微观组织对应关系证明添加Mo、Mo+B和Mo+Ni均可降低粒状贝氏体相变倾向,增大马氏体形成能力,从而改善淬透性。虽然添加Mo+B时抑制粒状贝氏体相变、改善淬透性的效果明显,但易受钢中的冶炼残留Al和N的影响,而添加Mo+Ni复合改善淬透性的作用更具优势,且不受钢中的冶炼残留Al和N的影响,因此添加Mo+Ni成为改善中碳Cr-Mn-Si钢淬透性优选的合金化方向。Effectiveness of adding Mo, Mo+B and Mo+Ni to improve the hardenability of a medium carbon Cr-Mn-Si steel was studied by means of traditional end quenching test method.The results show that the granular bainite phase transformation tendency of the medium carbon Cr-Mn-Si steels with adding Mo, Mo+B and Mo+Ni respectively is large, and the air-cooled end of Jominy end-quenching specimens forms granular bainite. Therefore, the quantitative hardenability information such as ideal critical diameter(DI) cannot be obtained from the end quenching curve in accordance with SAE J406 standard.However, the correspondence between the hardness of the end quenching curve and the microstructure proves that the addition of Mo, Mo+B and Mo+Ni in turn reduces the tendency of granular bainite transformation, increases martensite forming ability and improves hardenability.Although adding Mo+B can inhibit granular bainite transformation and improve hardenability effectively, it is susceptible to the influence of smelting residual Al and N in steel. While adding Mo+Ni has more advantages in improving hardenability, and it is not affected by smelting residual Al and N in steel. Therefore, adding Mo+Ni becomes the optimal alloying direction to improve the hardenability of medium carbon Cr-Mn-Si steel.

关 键 词：中碳Cr-Mn-Si钢 末端淬火 硬度 粒状贝氏体 淬透性 

分 类 号：TG146.2[一般工业技术—材料科学与工程]