1) Ductile-brittle transition
韧脆转变
1.
The ductile-brittle transitions due to both temperature and torsional prestrain were discussed by means of the micoscopic parameter ln(Rc/Ro).
利用扫描电镜测量了ＢＨＷ６０钢、２０钢和４５钢拉伸试样断口心部的临界空穴扩张比Ｒｃ／Ｒｏ，并据此分析了由于环境温度和扭转预应变等因素引起的韧脆转变过程及其细观形态。
2.
In notched tensile test of PA-6,ductile-brittle transition is occurred with tensile velocity increasing accompaning crack propagation work decreasing.
在尼龙-6单边缺口拉伸实验中,随着拉伸速度增加,缺口拉伸断裂发生韧脆转变,同时伴随着裂纹扩展功的急剧降低。
2) ductile-to-brittle transition
韧脆转变
1.
Investigation and Application on Ductile-to-Brittle Transition Behavior of Ice;
冰的韧脆转变行为研究及应用
2.
Previous studies have demonstrated that self-excited vibration occurred during the ice speed at which ice fails in ductile-to-brittle transition (DBT) range.
分析表明,冰致平台自激振动发生在冰的韧脆转变的冰速范围内。
3) ductile/brittle transition
韧脆转变
1.
A large sample of experiments was carried out to study influence of stress triaxiality and temperature on the growth of micro voids and the ductile/brittle transition(DBT) behavior of 40Cr steel.
对不同温度和应力状态下40Cr材料进行大子样宏观试验和细观观测,提出了一种新的材料断裂韧脆转变统计随机模糊模型· 该模型认为,在统计意义上,材料的韧性断裂为空穴机制,临界空穴扩张比参数可以作为韧性断裂的判据;材料的脆性断裂可以用内嵌币状裂纹的脆性断裂模型来模拟,为此测量断裂特征长度,提出并具体计算了控制币状裂纹失稳扩张的细观临界应力强度因子;在韧脆转变区域内,这两种机理并存并相互竞争,为此提出了模糊准则· 对模型参数进行了测量和统计分析,给出分布规律,给出了计算断裂特征的概率模型· 计算了韧脆转变区域内的细观机制变化和宏观响应· 结果表明,该模型及分析方法可以很好地模拟应力状态及温度对韧脆转变的影响·
2.
It is found that the temperature T V C corresponding to the valley value of fracture load represents the ductile/brittle transition of the CVN specimen and is controlled by the cleavage characteristic stress S CO .
揭示出断裂载荷随温度的变化呈现反“Ｓ”形特性，且在断裂载荷谷值点对应的温度ＴＶＣ处发生断裂的韧脆转变行为。
4) brittle-to-ductile transition
韧脆转变
1.
It was also observed that the brittle-to-ductile transition for this multiphase alloy was sensitive to strain ra.
15Hf合金具有明显的韧脆转变行为,韧脆转变温度依赖于应变速率。
2.
It is found that γ titanium aluminide manifests brittle-to-ductile transition (BDT) at elevated temperature and the brit-tle-to-ductile transition temperature (TBDT) is positively sensitive to the strain rate.
采用拉伸试验，研究了不同应变速率（10-5－10-1s-1）下温度对具有近全片层组织的γ＋α2双相Tial合金的屈服强度和延伸率的影响，得到Tial合金韧脆转变温度随应变速率升高而升高的变化关系，随后确定Tial合金韧脆转变激活能为324kJ／mol。
5) BDT
韧脆转变
1.
It manifests brittle-to-ductile transition (BDT) at elevated temperature and its brittle-to-ductile transition temperature (TBDT) is positively sensitive to the strain rate.
8％的TiB2、具有近全片层组织的Ti—47Al—2Mn－2Nb金属间化合物的屈服强度和延伸率的影响，得到合金韧脆转变温度随应变速率升高而升高的变化关系，确定这种含TiB2的TiAL合金的韧脆转变激活能为256kJ／mol这一数值低于无TiB2的合金的韧脆转变激活能（324kJ／mol），接近TiAl合金中原子自扩散激活能结合断口分析和理论计算结果，表明这种含TiB2的TiAl合金韧脆转变过程可能受位错攀移机制控制。
2.
The microstructure, BDT, elevated temperature compressive deformation and tensile creep are investigated by XRD, SEM and TEM.
15Hf合金的微观组织形貌、韧脆转变、高温变形行为和拉伸蠕变行为。
6) Ductile to brittle transition
韧脆转变
1.
(1) Ductile to brittle transition temperature (DBTT) of fine grain fine carbide specimens is lower than that of fine grain coarse carbide specimens and coarse grain coarse carbide specimens, fracture toughness of fine grain fine carbine specimens is higher than that of fine grain coarse carbide specimens and coarse grain coarse carbide specimens.
通过断口观察及细观临界参数值的测量;起裂源性质的分析比较;在不同温度下的塑性裂纹稳态扩展长度与断裂韧性的关系;裂尖前端的应力、应变和三向应力度分布的计算以及原始裂尖处小裂纹开裂和扩展的模拟等系列工作,得出以下主要结论:(1)细晶细碳化物比细晶粗碳化物和粗晶粗碳化物组织材料的韧脆转变温度低,断裂韧性高。
2.
Four-point bend test and numerical simulation method were used to investigate the crack tip stress and strain field and ductile to brittle transition behavior of pure Al interlayer,which was constrained by LY12 alloy at both sides through explosive bond method,under different strength mismatch ratio after heat treatment at different temperatures.
本文通过四点弯曲试验以及数值模拟方法对爆炸焊接的LY12/Al/LY12层合材料中纯铝中间层在不同界面强度错配比条件下裂端应力场及韧脆转变行为进行了研究。
补充资料：韧性－脆性转变温度
金属材料从韧性状态过渡到脆性状态的温度（Tk），也称延性-脆性转变温度或塑性-脆性转变温度，或简称脆性转变温度。用以表征金属材料的变脆倾向。这种倾向的大小一般用冲击试验测定,但试验的指标有多种,尚未统一。（见金属的强化）。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条