使渗碳

An analysis of the effect of the scales on the process of gas carburization is made and the probability of adding some coke to the furnace to decrease more quickly t...

同时对氧化皮影响气体渗碳进行了计算与分析，提出了在炉子中加入焦碳有可能使炉中的CO_2％较快地降低到正常的CO_2％量。

An analysis of the effect of the scales on the process of gas carburization is made and the probability of adding some coke to the furnace to decrease more quickly the per...

同时对氧化皮影响气体渗碳进行了计算与分析，提出了在炉子中加入焦碳有可能使炉中的CO_2％较快地降低到正常的CO_2％量。

A substantial precipitation of cementite begins at 600℉(315℃), which produces a decrease in hardness.

渗碳体的大量析出开始于 600℉(315℃)，这使硬度下降。

The fundamental is applying surface alloying by plasma technique and then carburizing, forming the surface HSS.

其形成机理是通过在廉价的金属材料表面，渗入合金元素W、Mo、Cr、V、Ti、Co等，然后再进行渗碳，使表面成分达到高速钢的基本要求。

Lathe Machining can realize automation or semiautomation with 2300mm of the maximum processing diameter. In addition, the processing range has been enlarged and processing precision has been upgraded for adding the heating-treatment shaft annealing furnace, carburizing furnace, handspike annealing line and quenching line with protected gas. Through technological reconstruction and equipment renewing, the grinding processing ability has been strengthened. As well, casting copper in cage workshop has realized melting by electric furnace.

车加工已实现自动化或半自动化，最大加工直径可达2300毫米，现已形成月产2000万元产值的能力，热处理在原有的基础上增加了井式退火炉，井式渗碳炉，推杆退火线和有保护气体的淬火线，磨加工经过技术改造和设备更新，使加工能力得到了增强，加工范围得到了扩大，加工精度得到了升级，保持架车间的铸铜实现了电炉化熔化，从而打破了保持架生产能力不足，依靠外协的局面。

For hypereutectoid steel, it can reduce the secondary cementite, and to avoid continuous mesh, do organization preparation for diffusion annealing.

对于过共析钢可减少二次渗碳体量，并使其不形成连续网状，为球化退火作组织准备。

Surface of plate face was very smooth, unlike rough, pebbly surface of cemented plates, such as U.S.

碳含量被增加到了VC钢的水平以使其容易淬火；加入适量的铜以减少镍的使用量；又加入少量的钼以加强淬火的硬化能力；在无须牺牲VC级别防护性能的情况下，没有采用对浅层装甲使用渗碳（大多数情况下外国的表面硬化处理方式）的工艺。

The experimental results denoted that the finer pearlite along the austenite boundaries in the as-cast Cr30Ni20NRE steel disappeared first under long-term and high-temperature service condition, and that an umber of Cr- richened carbides were formed due to unila-teral carburizing at long-term and high- temperature, consequently causing Ni to concentrate, bulging and calalyzing decomposition of the carburizing gas.

试验结果表明，长期在高温条件下服役，铸态Cr30Ni20NRE耐热钢中沿奥氏体晶界的珠光首先融入奥氏体，长期高温单边渗碳形成大量富铬碳化物，促使镍富集并起泡形成瘤状物，催化含碳气体的分解；表层瘤状物使辐射管表层疏松，表面积扩张，加快了碳向基体的渗入，提供了碳化物持续长大的条件，并引起沿碳化物周边开裂和奥氏体基体严重萎缩；合金元素的重新分布造成主合金元素铬和镍产生两极分化，镍和硅的富集促使石墨化，与侵入的氧形成内部氧化空洞和膨胀疏松，最终导致构件穿孔失效。

This corresponds to larger carbon transfer coefficients which can be increased with increasing carburizing temperature and can hardly be affected by carbon potential of the atmosphere.

提高渗碳温度，或渗剂中添加稀土，可使碳的传递系数增大。炉气碳势对碳的传递系数几乎没有影响。

Lid landing gear box body is formed with the motor gearbox. When the furnace cover needs opening , simply press the button in the control box then the furnace cover will descend at a uniform speed .For the sake of safety ,two movements institutions tops trip switch are mounted in the carburizing EAF .When the furnace cover is ascending , the lower movements institutions tops trip switch will automatically cut off the seepage carbon EAF control cabinet main circuit power supply, forcing the heating elements stop working since the power is cut off, The upper switch is used to restrict the height of the movements axis ,it can prevent the movements pumped up too high to cause theelevating screw abscisicing from the gear box.

炉盖升降机构由电机齿轮箱组成，当需要开启炉盖时，只需按下控制箱上的按组，炉盖即以均速上升下降，为了安全起见，在渗碳电炉升降机构上装设有两个行程开关，当炉盖上升时，下边的行程开关自动切断渗碳电炉控制柜主回路电源，使加热元件断电停止工作，上边的行程开关则限制升降轴升起的高度，以防升降抽升起过高，升降丝杆脱出齿轮箱。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。