| 1. | The grain refining process for 18ni 2450mpa martensite aged steel
马氏体时效钢细化晶粒工艺 |
| 2. | In addition , additive agent b and additive agent c has the effect of refining
此外，添加剂b和添加剂c也起到了细化晶粒的作用。 |
| 3. | Additive agent c has the effect of refining , but overmuch will reduce the solderabilit
添加剂c有细化晶粒的作用，但用量过多会降低。 |
| 4. | 2 . fined grains can further improve the mechanical properties , thermal shock and fatigue resistance of composites
通过起始粉末的控制细化晶粒能进一步改善复合陶瓷的力学、抗热震和热疲劳性能。 |
| 5. | The combined effect of v and re can delay the dynamic recrystallization , refine the grain and second phase particles , and promote the precipitation of v ( c , n ) considerably
钒和稀土复合微合金化有更强的推迟形变奥氏体动态再结晶，抑制奥氏体晶粒长大和细化晶粒的作用。 |
| 6. | Based on the cavitation in the melt generated by ultrasound , the mechanism by which the tiny insoluble particles were activated and became active solidification nuclei was discussed , and fine grains were obtained
基于超声波对熔体产生的空化效应，讨论了熔体中微粒超声活化成为结晶核心，促进形核和细化晶粒的作用机制。 |
| 7. | It attracts a great deal of researchers " attention to improve material ' s strengths and ductility by obtaining ultrafine grains and some development has been received , especially in nanocrystalline materials
通过细化晶粒来提高材料的强度和塑性，一直以来都受到广大研究人员的关注，近年来取得了不小的进步，特别是在纳米晶材料方面。 |
| 8. | The measure of grains " comminution is brought forward to improve plasticity at room temperature . the key of micro - crystal ' s production is that the time of sample ' s being at high temperature is shorter . the process of crystal ' s growing up will be restrained
提出了通过细化晶粒来提高室温塑性的措施，指出了细化晶粒的关键是在合成过程中使坯料处在高温状态的时间短，以抑制晶粒的长大过程。 |
| 9. | In this dissertation , investigations were performed aiming at metallic polycrystals with medium grain size . numerical simulations and uniaxial tension tests were carried out to investigate the evolution of microstructure and mesoscopic viscoplastic behavior at elevated temperature
本文主要针对未经细化晶粒处理的金属多晶材料，试验和数值模拟相结合，研究高温变形中材料微结构演化及细观粘塑性力学行为。 |
| 10. | Based on the analyses on mechanical properties , microstructure and fracture of - the microalloyed steels socrv with various heat treatment technique , it can be affirmed that various fractures arttribute to various mechanism , we can draw conclusion that the strength and toughness of microalloyed steels 50crv will be increase simultaneously by optimal heat treatment technique . to illustrate the mechanism of the strength and toughness of microalloyed steels socrv , we designed the comparative experiment and observed the microstructure of the sample which occurred at different quench and tempering temperature and different tempering time . the last experiment results were determined by the four factors : fined microalloyed elements grains , the decompound of martensite , martensite transformation of remnant austenite and the second phase precipitation
为解释微合金化50crv钢强韧化机理，本文通过对不同淬火温度，回火温度，回火时间下的力学性能指标的对比及显微分析，认为微合金元素的细化晶粒，马氏体的回火分解，残余奥氏体的转变，第二相的沉淀析出共同决定了微合金钢的强韧化情况，特别是由于微合金元素的存在，其细化晶粒及其碳氮化物的沉淀析出，导致钢的良好的强韧性，并且如果工艺满足第二相的沉淀析出强化大于回火马氏体分解引起的软化效应，会在硬度曲线中产生明显的二次硬化现象。 |
