再渗碳

The results showed that both warm and cold deformation significantly promoted the precipitation of cementite as well as recovery and recrystallization of ferrite.

实验结果表明，变形显著影响马氏体分解过程，促进渗碳体的析出和铁素体回复及再结晶。

The formation of dispersive distribution of fine cementite particles could be explained by the mechanism of dissolution-re-precipitation.

细小渗碳体粒子在铁素体基体上的弥散分布可以用溶解－再析出机制来解释。

Partial dissolution and re-precipitation of cementite during warm deformation were confirmed.

温变形过程中渗碳体溶解和在铁素体内再析出的事实得到证实。

The redistribution of cementite particles in the ferrite matrix has been observerd, which can be interpreted in terms of dissolution-reprecipitation mechanism.

渗碳体粒子在铁素体基体上的弥散分布可以用溶解－再析出机制来解释。

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。

The surface heat processing man method has the flame hardening and induction heating the heat treatment, the commonly used heat source has oxyacetylene or flame, the induced current, the laser and the electron beam and so on oxygen propane and so on.

在渗入元素后再进行其它热处理工艺，比如淬火和回火。化学热处理的主要有渗碳、渗氮、渗金属的方法。

Microstructure evolution in eutectoid steel during warm deformation in the temperature range from 600 to 700℃ was investigated by simulating hot compression test, SEM and thermomagnetic measurement. The effects of deformation and subsequent annealing on the spheroidizing of pearlite, refining of microstructure and dissolution of cementite were studied.

利用热模拟压缩变形、SEM和热磁法实验，研究了共析钢在600~700℃变形过程的组织演变规律，探讨了变形及随后保温过程对珠光体球化、组织超细化和渗碳体溶解、再析出的影响。

Based on allotropic transformation of ingot,the definition,strength performance and feature of the iron-carbon alloy basic phase(ferrite,austenite and carburizing) are analyzed on the iron-carbon alloy phase diagram .

在铁碳合金相图上直接从工业纯铁的同素异晶转变开始分析铁碳合金基本相铁素体、奥氏体和渗碳体的定义、力学性能、特点等，再用铁碳合金基本相和相图的规律来分析铁碳合金相图的点、线和各区域组织。

The present invention has the hot treating furnace pre-vacuumized to 10-100 Pa, introduced with high purity nitrogen and heated to 900-1050 deg.c, before maintaining and introducing acetylene gas to carburize at nitrogen pressure of 0.1-0.11 MPa and acetylene gas pressure of 5000-20000 Pa.

本发明通过向设有炉内循环风机的热处理炉进行预抽真空至10-100Pa，通入高纯氮气，再将炉温升至900-1050℃，保温后再通入乙炔气进行渗碳，炉膛内氮气的压力为1×10 5 -1.1×10 5 Pa之间，充入的乙炔分压为5000-20000Pa之间。

A method for eliminating the internal oxide structure in the gas-phase carbon-nitrogen osmosis of gear features that the CCL4 is added to the kensene as carburizer and then is decomposed to generate Cl2 for reducing the oxide, the ammonia gas as nitrizing agen passes through the cylinder of silica gel or granular calcium chloride for adsorbing residual water vapour and then through the cylinder of 5A molecular sieve for adsorbing residual O2, and the resistance wire is wound on igniting pipe at furnace top to prevent the NH4Cl in exhausted gas from being condensed.

本方法采用在气体渗碳剂煤油中，加入6～8％的CCl 4 ，使共渗炉内的CCl 4 分解出新生的Cl 2 ，使已形成的合金元素内氧化物还原；在渗碳剂氨气入共渗炉前，先经过硅胶瓶或桶及粒状氯化钙瓶或桶过滤，吸附掉氨气中的残留水蒸汽，再经过5A分子筛瓶或桶吸附掉氨气中的残留氧；在靠近炉顶位置的点火管周围缠绕带瓷环的电阻丝，靠电阻丝的副带加热，使排气中的NH 4 Cl不冷凝结块等措施实现内氧化组织的消除。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。