韧性钢

LD is a kind of high toughness Cold-work die steel with excellent performance.

强度韧性是一般冷作模具钢的两倍，具有良好的耐磨，强度，韧性。

To measure the fracture toughness and crack propagation parameters of Q235 steel by fatigue experiment from the point of energy, J integral and the other method are used in measuring.

2从能量的观点出发，通过结构疲劳实验和标准实验，分别用柔度法和J积分测量法测量了Q235钢的断裂韧性值，同时，测量了Q235钢与疲劳裂纹扩展速率相关的两个参数，为基于Q235钢的机械承载结构裂纹的珍断与控制打下了坚实的基础。

The relationship between fracture toughness and notch toughness, tensile ductilities in lath martensite steel has been investigated.

研究了超高强度板条马氏体钢的平面应变断裂韧性与缺口韧性、拉伸塑性之间的关系。

Chemical compositionl and the heat treatment conditions of the low alloy cast mild steel were studied in this paper.

对低碳低合金抗磨钢的化学成分、热处理工艺规程，进行了详细的分析和研究，摸索出获得高韧性、高硬度抗磨钢的热处理工艺规程，从而扩大了铸造抗磨钢的应用范围。

So, in this paper, H13 isused as study object, its quencher and temper technics are studied too.

因此，本文决定以H13钢作为研究对象，并对其进行淬火、回火工艺研究，结果表明，H13钢采用二级盐浴分级淬火，比采用一级盐浴分级淬火能使H13钢获得更大的冲击韧性。

The test results show that the crispest HAZ occurs in the process of welding of the 14MnNbq steel on the first heat circulation submerged welding overheat zone and the second heat circulation submerged welding overheat zone plus the not entirely re crystallized zone. The 14MnNbq steel has a tendency of being crisper due to overheat than the SM490C steel is. In order to ensure the toughness of the welding HAZ′s, the welding wire capacity should be properly controlled during welding.

由试验结果表明，14MnNbq钢焊接HAZ最脆区出现在一次热循环的埋弧焊过热区及二次热循环的埋弧焊过热区+不完全重结晶区；14MnNbq钢比SM490C钢有更强的过热脆化倾向，为确保焊接热影响区韧性，焊接时应适当控制焊接线能量。

Maraging steels has the best intensity in the whole steels with well toughness, good welding property, mechanical working properties and stress corrosion resistance.

马氏体时效钢是钢中强度最高的钢类，其具有高韧性、良好的焊接性、冷热加工性和耐应力腐蚀性。

High carbon and high molybdenum high speed steel has ...

高碳高钼高速钢具有硬度高、红硬性和耐磨性好等特点，但铸造高速钢脆性大，采用RE -Mg -Ti复合变质处理，可以改变共晶碳化物的形态和分布，使铸造高速钢冲击韧性提高 86 。2 %，热疲劳抗力和耐磨性也明显改善。

Various kinds of steel such as structure steel, tool steel, pipe line steel, reinforcing steel bar, common engineering steel and cast iron may be improved in their properties by vanadium nitrides and carbides.

已有的研究表明碳氮化钒添加于钢中能提高钢的耐磨性、耐腐性、韧性、强度、延展性和硬度以及抗热疲劳性等综合机械性能，并使钢具有良好的可焊接性能，而且它能起到消除夹杂物等作用，在高强度低合金钢中的应用效果更加明显。

Longer fatigue life is the key point for spring steel with ultimate tensile strength of 2 000 N/mm2 grade.

提高齿轮钢的强度需要改善其抗疲劳性能；1200N/mm2螺栓钢和2000N/mm2弹簧钢的强度需要改善抗延迟断裂性能和抗疲劳性能；提高微合金非调质钢的强度需要改善其韧性。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。