摘要
氮是1Cr17Ni2钢中重要且实用的合金元素之一,为明确氮含量对1Cr17Ni2钢的组织和室温力学性能的影响规律,指导实际生产过程中氮含量的控制,对比研究了氮含量分别为0.0302%、0.0602%及0.0705%(质量分数,下同)时1Cr17Ni2钢的显微组织和力学性能变化规律。结果表明:3组不同氮含量的钢均在1030℃保温1h时奥氏体化,然后经油冷淬火至室温,再经690℃保温1h回火后空冷,发现氮含量增加使钢显微组织中δ铁素体的面积百分含量逐渐降低,室温抗拉强度增加,屈服强度无明显变化,断后伸长率和断面收缩率均降低,冲击吸收能量和布氏硬度均先发生显著变化后趋于平缓。总体来说,氮含量为0.0602%和0.0705%时试验钢的室温性能无显著差异,但二者均与氮含量为0.0302%的试验钢差异较大,特别是室温冲击性能变化明显。为保证1Cr17Ni2钢各项力学性能指标在规定范围内,钢中氮含量控制在0.0302%附近为宜。
Nitrogen is one of the important and practical alloying elements in 1Cr17Ni2 steel.To clarify the influence of nitrogen on the microstructure and room temperature mechanical properties of 1Cr17Ni2 steel and to guide the actual control of nitrogen content,this paper comparatively studied the variation of microstructure and mechanical properties of 1Cr17Ni2 steel when the nitrogen mass percents are 0.0302%,0.0602%,and 0.0705%,respectively.All three experimental steels were austenitized at 1030℃ for 1hour,then oil-quenched to room temperature,and subsequently tempered at 690℃for 1hour before air cooling.It was found that as the nitrogen content increases,the area percentage ofδferrite in steel gradually decreases,the room temperature tensile strength increases,the yield strength changes slightly,both the elongation after fracture and the reduction of area decrease,and the impact energy and Brinell hardness first change significantly and then remain unchanged.Overall,the room temperature properties of the experimental steels with nitrogen contents of 0.0602%and 0.0705%are not significantly different,but differ considerably from the experimental steel with a nitrogen content of 0.0302%,especially in terms of the variation pattern of room temperature impact performance.To ensure that all mechanical property indicators of 1Cr17Ni2 steel are within the specified range,the nitrogen content in the steel should be controlled around 0.0302%.
作者
李造宇
李耀文
谢毓敏
刘丹
宋明明
伍祎
LI Zaoyu;LI Yaowen;XIE Yumin;LIU Dan;SONG Mingming;WU Yi(Daye Special Steel Co.,Ltd.,Huangshi 435001,Hubei,China;Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steeling,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China;Hubei Key Laboratory of High Quality Special Steel,Huangshi 435001,Hubei,China)
基金
国家自然科学基金青年基金项目(52301071)
湖北省杰出青年科学基金项目(2024AFA080)。
