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国家自然科学基金(50974080)

作品数:7 被引量:24H指数:3
相关作者:陈祥李言祥张华伟刘源胡潇更多>>
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Microstructure and mechanical properties of a new type of austempered boron alloyed high silicon cast steel被引量:7
2013年
In the present paper, a new type of austempered boron alloyed high silicon cast steel has been developed, and its microstructures and mechanical properties at different temperatures were investigated. The experimental results indicate that the boron alloyed high silicon cast steel comprises a dendritic matrix and interdendritic eutectic borides in as-cast condition. The dendritic matrix is made up of pearlite, ferrite, and the interdendritic eutectic boride is with a chemical formula of M2B (M represents Fe, Cr, Mn or Mo) which is much like that of carbide in high chromium white cast iron. Pure ausferrite structure that consists of bainitic ferrite and retained austenite can be obtained in the matrix by austempering treatment to the cast steel. No carbides precipitate in the ausferrite structure and the morphology of borides remains almost unchanged after austempering treatments. Secondary boride particles precipitate during the course of austenitizing. The hardness and tensile strength of the austempered cast steel decrease with the increase of the austempering temperature, from 250℃ to 400 ℃. The impact toughness is 4-11 J.cm^-2 at room temperature and the impact fracture fractogragh indicates that the fracture is caused by the brittle fracture of the borides.
Chen XiangLi Yanxiang
关键词:BORIDE
Effects of carbon content on high-temperature mechanical and thermal fatigue properties of high-boron austenitic steels被引量:5
2016年
High-temperature mechanical properties of high-boron austenitic steels (HBASs) were studied at 850 ℃ using a dynamic thermal-mechanical simulation testing machine. In addition, the thermal fatigue properties of the alloys were investigated using the self-restraint Uddeholm thermal fatigue test, during which the alloy specimens were cycled between room temperature and 800℃. Stereomicroscopy and scanning electron microscopy were used to study the surface cracks and cross-sectional microstructure of the alloy specimens after the thermal fatigue tests. The effects of carbon content on the mechanical properties at room temperature and high-temperature as well as thermal fatigue properties of the HBASs were also studied. The experimental results show that increasing carbon content induces changes in the microstructure and mechanical properties of the HBASs. The boride phase within the HBAS matrix exhibits a round and smooth morphology, and they are distributed in a discrete manner. The hardness of the alloys increases from 239 (0.19wt.% C) to 302 (0.29wt.% C) and 312 HV (0.37wt.% C); the tensile yield strength at 850 ℃ increases from 165.1 to 190.3 and 197.1 MPa; and the compressive yield strength increases from 166.1 to 167.9 and 184.4 MPa. The results of the thermal fatigue tests (performed for 300 cycles from room temperature to 800 ℃) indicate that the degree of thermal fatigue of the HBAS with 0.29wt.% C (rating of 2-3) is superior to those of the alloys with 0.19wt.% (rating of 4-5) and 0.37wt.% (rating of 3-4) carbon. The main cause of this difference is the ready precipitation of M23(C,B)6- type borocarbides in the alloys with high carbon content during thermal fatigue testing. The precipitation and aggregation of borocarbide particles at the grain boundaries result in the deterioration of the thermal fatigue properties of the alloys.
Xiang ChenZhi-sheng WangYan-xiang LiHua-wei ZhangYuan Liu
关键词:STEELAUSTENITEBORIDE
Ti对高硼钢显微组织和高温力学性能的影响被引量:6
2018年
采用SEM和XRD研究了Ti对高硼钢显微组织的影响。采用冲击试验机、热力学模拟实验机、氧化增重法分析了Ti对高硼钢室温冲击及850℃高温力学、抗氧化性能的影响。结果表明,添加Ti后,基体内硼化物形态圆整、呈离散状分布,尺寸大幅减小。这种硼化物形态、分布的优化提高了高硼钢的室温冲击韧性。高硼钢中添加Ti后在基体内形成了TiC析出相,并使基体由单一奥氏体转变为奥氏体+铁素体双相组织。添加Ti元素后,B含量较低时提高B含量可以提高材料的高温力学性能;但B含量较高时,高温力学强度变化不大。B含量为0.33%(质量分数)时,材料的高温力学性能最佳。添加Ti前后高硼钢的850℃氧化测试结果均符合GB/T 13303-1991中2级"抗氧化性"标准,Ti的加入有利于提高高硼钢高温抗氧化性能。
陈祥李言祥王志胜张华伟刘源
关键词:TI硼化物高硼钢高温力学性能高温抗氧化性能
变质处理对高硅铸钢残留奥氏体及力学性能的影响被引量:3
2011年
采用X射线衍射对RE/V/Ti复合变质处理后高硅铸钢等温淬火组织中残留奥氏体量及残留奥氏体含碳量进行了测定。采用透射电子显微镜(TEM)和光学显微镜(OM)对高硅铸钢等温淬火热处理后的显微组织以及残留奥氏体分布形态进行了研究。结果表明,等温温度低于385℃时,复合变质处理高硅铸钢中残留奥氏体量及残留奥氏体平均含碳量均低于未变质高硅铸钢;385℃等温处理时,两者的残留奥氏体量及残留奥氏体平均含碳量基本相同。等温淬火高硅铸钢显微组织中残留奥氏体呈两种分布形态:薄膜状及块状。在相同的等温温度下,复合变质处理使残留奥氏体薄膜厚度以及贝氏体铁素体板条厚度、长度均大幅度减小,块状残留奥氏体的量大为减少,有利于高硅铸钢综合力学性能的提高。
陈祥
关键词:高硅铸钢等温淬火残留奥氏体变质处理
高硼奥氏体钢硼化物形态及分布优化被引量:1
2023年
传统高硼铁基合金中硼化物一般位于晶界位置,沿晶界呈网状或鱼骨状分布,具有尖锐边角,破坏了基体连续性,大大降低材料的力学性能。本文采用光学金相显微镜(OM)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、飞行时间二次离子质谱仪(TOF-SIMS)和X射线衍射(XRD)研究了碳含量对高硼奥氏体钢组织的影响。采用热力学模拟试验机分析了碳含量对实验钢850℃高温力学性能的影响。结果表明,高硼奥氏体钢的碳含量较高(0.37%~0.42%,质量分数)时,可稳定得到形态圆整的硼化物,且硼化物在基体内呈粒状离散化均匀分布,无网状、鱼骨状沿晶界连结贯通的分布状态。粒状离散化硼化物为Fe_(1.1)Cr_(0.9)B_(0.9)、Mn_(2)B_(0.98)、Cr_(2)B的络合产物,硼化物中Cr、Mn的加入,以及基体C含量的提高,促进了硼化物形态圆整、分布粒状离散化。锻造工艺同样对硼化物的粒状离散分布起到直接促进作用。锻造的始锻温度达到1 150℃是硼化物实现粒状离散分布的基本条件。
陈祥陈祥刘仲礼
关键词:硼化物高硼钢形貌高温力学性能
等温淬火含硼高硅铁基合金的韧化研究被引量:3
2014年
等温淬火含硼高硅合金是一种新型的金属耐磨材料,它以高硬度的硼化物耐磨相代替传统的碳化物耐磨相,是在高硅铸钢合金成分的基础上添加一定量的硼元素并经由等温淬火的热处理而得到的。通常含硼高硅合金在铸态下由枝晶状基体与沿晶界分布的网状共晶硼化物组成,基体为层片状的珠光体和一定量的沿硼化物周围生长的层状铁素体,但网状分布的硼化物严重降低了其韧性。本研究在去除合金元素铬、钼的情况下通过添加钛元素进行变质,使得硼化物的形态由连续网状转变为粒状,合金在硬度基本不变的前提下冲击韧性从4 J/cm2提高至30 J/cm2。
陈祥胡潇李言祥
关键词:等温淬火硼化物变质处理高硅
B对高硼奥氏体钢高温抗氧化性能的影响被引量:2
2015年
采用氧化增重法研究了高硼奥氏体钢在850℃下的高温抗氧化性能,采用SEM和XRD研究了其氧化产物的组织形貌与相组成,分析了B对材料高温抗氧化性能的影响。结果表明,添加B后,B在奥氏钢高温氧化测试中形成了致密的硼酸盐氧化膜,提高了钢的抗高温氧化性能。在850℃保温20h后的氧化增重速度由不含B的4级"弱抗氧化性"提高到2级"抗氧化性",且奥氏体钢高温抗氧化性能优于ESR-H13钢的5级"不抗氧化性"。
王志胜陈祥李言祥张华伟刘源
关键词:奥氏体钢抗氧化性能
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