金属热处置

来历: beat365唯一官网:上海希迪管件无限公司  日期:2021-03-29 11:24:38  点击:1919  属于:资料机能
热处置Heat-treatment,热处置是锻落后行一次或屡次从头加热和冷却操纵的热轮回进程,以便使锻件取得所需的显微构造和力学机能。经常利用的产业化热处置有球化、正火、退火、淬火和回火。热处置包含把资料加热到某一预约温度,在此温度下停止“均热”或保温,在氛围、液体或保温介质中按划定的速度冷却

热处置Heat-treatment

Heat treatment is thermal cycling involving one or more reheating and cooling after forging the purpose of obtaining desired microstructure and mechanical properties in a forging.
热处置是锻落后行一次或屡次从头加热和冷却操纵的热轮回进程,以便使锻件取得所需的显微构造和力学机能。

Few forgings of the types are produced without some form of heat treatment.Untreated forgings are usually relatively low carbon steel parts for noncritical applications or are parts intended for further hot mechanical work and subsequent heat treatment.The chemical compositions of the steel, the size and shape of the product,and the properties desired are important factors in determining which of the following production cycles to use.

有些范例的锻件出产不某些情势的热处置。未颠末处置的锻件凡是长短关头布局的绝对低碳钢部件或用于进一步热机运作和热处置的部件。钢的化学成份,产物的外形和尺寸和所需的机能是决议若何挑选下一个出产周期的主要身分。

The object of heat treating metals is to impart certain desired physical properties to the metal or to eliminate undesirable structural conditions which may occur in the processing or fabrication of the material. In the application of any heat treatment it is desirable that the “previous history” or structural condition of the material be known so that a method of treatment can be prescribed to produce the desired result. In the absence of information as to the previous processing, a microscopic study of the structure is desirable to determine the correct procedure to be followed.

金属热处置的目标是使金属取得所需的物理机能或消弭那些在资料出产和加工中能够呈现的不好的构造布局。在任何热处置的利用中,须要晓得资料的“既往史”或构造布局,以便一种处置方式能够按划定发生希冀的成果。在对以往加工信息缺少时,布局的微观研讨对接上去准确路子简直定是必不可少的。

The commercial heat treatments in common use are spheroidizing, normalizing, annealing, hardening,and tempering. They involve the heating of the material to certain predetermined temperatures,” soaking” or holding at the temperature, and cooling at a prescribed rate in air, liquids, or retarding media.The above treatment may be briefly defined as follows:

经常利用的产业化热处置有球化、正火、退火、淬火和回火。热处置包含把资料加热到某一预约温度,在此温度下停止“均热”或保温,在氛围、液体或保温介质中按划定的速度冷却。以上热处置能够简略界说以下:

Spheroidizing----prolonged heating of iron-based alloys at a temperature slightly below the critical temperature range followed by relatively slow cooling,usually in air. Small objects of high carbon steel are more rapidly spheroidized by prolonged heating to temperatures alternately within and slightly below the critical temperature range.The purpose of this heat treatment is to produce a globular condition of the carbide.

球化----在氛围中,对铁基合金在略低于临界温度规模内长时候加热,再以绝对迟缓的速度冷却。在临界温度内及略低于此温度之间长时候瓜代加热,高碳钢小件将更敏捷被球化。这类热处置的目标是为了取得球状的碳化物。

Normalizing-----heating iron-base alloys to temperatures approximately 50℃above the critical temperature range followed by cooling in air to below the range.The purpose is to put metal structure in a normal condition by removing all internal strains and stresses given to the metal during some processing operation.

正火----铁基合金加热到约高于临界温度规模50℃,而后在氛围中冷却至低于此规模。正火的目标是去除金属外部在一些加工工程中发生的应力和应变,而使金属布局在一个一般的状况。

Annealing is a comprehensive term applied to heat treatments which may be used to remove stresses;induce softness;alter ductility, toughness, electrical, magnetic,or other physical properties,refine the crystalline structure; remove gases;or produce a microstructure. The temperature of the treatment and the rate of cooling depend upon the object of the treatment and the composition of the material being heat treated.

退火是一个归纳综合性的术语,是用于去除应变,下降硬度,转变延展性、韧性、导电性、磁性或其余物理机能,改良晶体布局,去除气体,或发生一种微观布局的热处置。热处置的温度和冷却的速度取决于热处置的工具和热处置资料的成份。

Hardening is the heating and quenching of certain iron-base alloys from a temperature either within or above the critical temperature range. The temperature of the heating and the length of time at this temperature, or “soaking period”, depend upon the composition of the material.The quenching media used may depend upon the composition, hardness desired,and the complexity of the design.

淬火是将某些铁基合金加热光临界温度规模内或略高于此温度规模并骤冷。热处置温度和保温时候,或“均热阶段”,取决于资料的构成。利用的淬火介质取决于资料构成、所需硬度和设想的庞杂性。

Tempering is the reheating after hardening of iron-base alloys to some temperature below the critical temperature range, followed by any desired rate of cooling. The purpose of tempering is the removal of strains, and the reduction of hardness and brittleness.

回火是将淬火后的铁基合金从头加热到低于临界温度规模的某个温度,而后以任何须要的速度冷却。回火的目标是去除应力和下降硬度和脆性。

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