锻压技术

差异化控冷对C70S6钢胀断连杆微合金碳氮化物析出相的影响

英文标题：Influence of differential cooling control on microalloy carbonitride precipitated phase for bulging fractured connecting rod of C70S6 steel

作者：王占花1 惠卫军2 赵秀明3 程龙4

单位：1.苏州经贸职业技术学院机电技术学院 2.北京交通大学机械与电子控制工程学院 3.南京工程学院材料工程学院 4. 浙江亚太机电股份有限公司

关键词：C70S6非调质钢冷却速度胀断连杆析出相析出强化

分类号：TG142.1

出版年,卷(期):页码：2023,48(3):27-33

摘要：

为了推进非调质钢C70S6的国产化进程，明确C70S6钢生产胀断连杆时冷却速度工艺控制问题，分析讨论了冷却速度对C70S6钢中微合金碳氮化物析出的影响。通过利用金相显微镜(OM)、扫描电镜(SEM)及X射线衍射仪(XRD)等设备，采用物理-化学相分析方法，对热锻后空冷及风冷国产C70S6非调质钢胀断连杆工字筋部位微合金碳氮化物析出相的组成及粒度分布等微观特征进行观察，并量化了微合金碳氮化物M(CN)析出相的析出强化行为。果表明，冷却速度为3和4 ℃·s-1 时，微合金碳氮化物析出相均为面心立方结构，名义化学式分别为(V0.896Cr0.070Mo0.034)(C0.259N0.741)、(V0.927Cr0.050Mo0.024)(C0.259N0.740)；析出相的尺寸分布集中在1~18 nm；析出相对屈服强度的贡献量分别约为122.0和127.6 MPa；冷却速度加快，微合金碳氮化物析出相的尺寸得到一定的细化，但效果不明显。

In order to promote the localization process of non-quenched and tempered steel C70S6 and clarify the problem of cooling speed process control during the production of C70S6 steel bulging fractured connecting rod, the influence of cooling speed on the precipitation of microalloy carbonitride in C70S6 steel was analyzed and discussed. Then, through the use of metallographic microscope (OM), scanning electron microscope (SEM) and X-ray diffractometer (XRD) and other equipments, using physical-chemical phase analysis method, the microscopic characteristics such as composition and particle size distribution of the microalloy carbonitride precipitated phase in the I-beam position of domestic C70S6 non-quenched and tempered steel bulging fractured connecting rod by air cooling and wind cooling phase after hot forging were observed, and the precipitation strength behavior of microalloy carbonitride M(CN) precipitated phase was quantified. The results show that when the cooling speed is 3 and 4 ℃·s-1, the microalloy carbonitride precipitated phase are all face-centered cubic structures, and the nominal chemical formulas are (V0.896Cr0.070Mo0.034)(C0.259N0.741) and (V0.927Cr0.050Mo0.024)(C0.259N0.740). The size distribution of the precipitated phase is concentrated in 1-18 nm, and the contributions of precipitated phase to yield strength are about 122.0 and 127.6 MPa, respectively. When the cooling speed is accelerated, and the size of microalloy carbonitride precipitated phase is refined to a certain extent, but the effect is not obvious.

基金项目：

国家重点研发计划项目(2016YFB0300100)；苏州经贸职业技术学院2022年校级课题(YJ-ZX2208)

作者简介：王占花(1989-)，女，博士，讲师 E-mail：16116344@bjtu.edu.cn

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