You are here: Home > News > Content

What Are The Methods Of Forgings Heat Treatment?

Edit: Jingjiang Jinlun Machine Manufacturing Co.,Ltd    Date: Sep 05, 2017

What are the methods of Forgings heat treatment?
  Forgings according to steel and process requirements are different, often using the following heat treatment methods: annealing, normalizing, quenching and tempering, quenching and low temperature tempering, quenching and aging. Then we have to look at how specific it is:
       1. Annealing:
       Forgings annealing process has a complete annealing, spheroidizing annealing, low temperature annealing and isothermal annealing and other forms, according to the Forgings material and deformation to select.
       After the annealing of the Forgings, the recrystallization finishes the grain, eliminates or reduces the residual stress, thereby reducing the hardness of the Forgings, improving its plasticity and toughness, and improving the cutting performance.
       2. normalizing:
       Normalizing is generally the Forgings heated to the GSE line above 50-70 ℃, some high alloy steel Forgings heated to the GSE line above 100-150 ℃, after proper insulation and then air cooling. Such as normalized afterggle hardness is high, in order to reduce the hardness of Forgings, but also should be high temperature tempering, the general tempering temperature of 560-660 ℃.
 3. quenching, tempering:
       Quenching is to obtain an unbalanced tissue to improve strength and hardness. Heat the steel Forgings to above the Ac1 line at 30-50 ° C. After the cold quenching.
       Tempering is to eliminate the quenching stress, get a more stable organization, the Forgings heated to Ac1 line below a certain temperature, heat for some time, and then air-cooled or cold.
       4. quenching, aging:
       High temperature alloys and alloys that can be reinforced by heat treatment, often subjected to quenching aging treatment after Forgings. The quenching of the alloy is heated to the appropriate temperature, the full insulation, so that some of the alloy structure of the alloy dissolved in the matrix to form a uniform solid solution, and then quickly cooled to become supersaturated solid solution, it is also known as solution treatment. The aim is to improve the plasticity and toughness of the alloy and to prepare for further aging treatment. Aging treatment is the supersaturated solid solution or cold deformation after the alloy placed at room temperature or heated to a temperature, heat for a period of time, so that the previously dissolved in the matrix of the material, evenly dispersed precipitation. The purpose of aging treatment is to improve the strength and hardness of the alloy.
       Forgings heat treatment is carried out according to certain heat treatment specifications, according to the Forgings steel, section size and technical requirements, and refer to the relevant manual and data. Its contents include: heating temperature, holding time and cooling methods. Generally used temperature - time curve to represent.
Forgings quality problems arise in many ways, through the macroscopic and microscopic analysis of Forgings, and sometimes also to simulate the test, to get the quality of the problem is whether the Forgings process itself or other factors (such as raw materials, heat treatment, The process of dealing with or test their own mistakes, etc.); is Forgings process is not reasonable or imperfect process discipline is not strictly serious implementation of the process, which are only after careful study and analysis can be made after the conclusion.
       Since the quality problems of Forgings include the appearance quality and internal quality problems, and the possible interrelationships between the various problems, the focus of the analysis should be comprehensive, taking into account the relationship between Forgings and mechanical properties, Forgings defects Their own mutual influence.
  Therefore, Forgings quality analysis work can be divided into field investigation phase, experimental analysis and analysis stage, put forward measures to prevent and prevent countermeasures. Before implementing these stages of work, it is advisable to develop an implementation plan that includes the work to be carried out in these three phases. This embodiment may be supplemented and modified in the course of implementation. The implementation of the implementation of the program is to analyze the large complex Forgings and the use of pieces of quality problems an important part.
      In the field investigation phase, mainly to investigate the materials used Forgings materials, grades, chemical composition, material specifications, material assurance on the test results, into the plant re-test a variety of physical and chemical testing and process performance test results, and even check Raw material smelting and processing technology. At the same time should also investigate the Forgings of the process, including Forgings should be used in the material, specifications, cutting technology, Forgings heating Forgings and final Forgings temperature, the use of Forgings equipment, heating equipment, heating process, Forgings operation, Forgings after the cooling method, the preparation of heat treatment process. If necessary, to investigate the situation of the operator and the environment and the implementation of the original process. For the follow-up process and the use of Forgings child problems should also investigate the follow-up process.

Jingjiang Jinlun Machine Manufacturing Co.,Ltd