摘要
为了适应大型锻件高温重载的工艺环境,设计了一种新型的“拳头”式锻模,该锻模主要由“皮肤层”、“骨头层”和铸钢基体组成。选择铁基高温合金JX03作为“骨头层”,对其多道次热压缩前后的组织成分和力学性能变化规律进行了探究。同时,利用有限元模拟软件DEFORM对铁基高温合金JX03作为“骨头层”时的服役情况进行了分析。采用光学显微镜(OM)、X射线衍射(XRD)、能谱仪(EDS)观察了材料多道次热压缩前后的显微组织变化,采用显微硬度实验观测了其力学性能变化。结果表明:铁基高温合金JX03中较多的索氏体分布为其带来了较好的综合力学性能,主要成分为Cr_(23)C_(6)的合金碳化物形成了弥散强化,而结合面处强化元素含量的降低对结合强度造成了一定的负面影响,但铁基高温合金JX03的显微硬度在热压缩后有了一定提升。有限元分析显示铁基高温合金JX03作为“骨头层”可在凸台与侧壁提供较优的结构支撑,在平台与凹陷处提供足够的应力缓冲。
In order to adapt to the process environment of high temperature and heavy load for large forgings,a new type of“fist type”forging die was designed,which was mainly composed of“skin layer”,“bone layer”and cast steel matrix.Then,taking the iron based superalloy JX03 as the“bone layer”,its microstructure and mechanical properties changes law before and after multi-pass hot compression were studied.At the same time,the service condition of iron based superalloy JX03 as“bone layer”was analyzed by the finite element simulation software DEFORM,the microstructure changes of materials before and after multi-pass hot compression were observed by optical microscope(OM),X-ray diffraction(XRD)and energy dispersive spectrometer(EDS),and the mechanical properties changes were observed by microhardness test.The results show that the more sorbite distribution in iron based superalloy JX03 leads to better comprehensive mechanical properties,and the alloy carbides mainly composed of Cr_(23)C_(6)form dispersion strengthening.However,the decreasing of strengthening element content at the jojnt surface has a negative effect on the bonding strength,but the microhardness of iron based speralloy JX03 is improved after hot compression.Thus,the finite element analysis shows that iron based superalloy JX03 as a“bone layer”can provide better structural support in the boss and side wall and provide enough stress buffer in the platform and depression.
作者
陈沿宏
夏玉峰
廖海龙
张雪
彭梦霞
Chen Yanhong;Xia Yufeng;Liao Hailong;Zhang Xue;Peng Mengxia(Department of Materials Science and Engineering,Chongqing University,Chongqing 400000,China)
出处
《锻压技术》
CAS
CSCD
北大核心
2022年第5期204-210,225,共8页
Forging & Stamping Technology
基金
国家自然科学基金资助项目(51775068)。
关键词
热锻模
铁基高温合金
多道次热压缩
显微组织
力学性能
hot forging die
iron based superalloy
multi-pass hot compression
microstructure
mechanical properties
