CN103192013A - Method for controlling forging state 316LN steel forging crack initiation - Google Patents

Abstract

The invention discloses a method for controlling forging crack initiation of forged 316LN steel, which belongs to the technical field of forging technology. The feature is: According to the application number: 201310024108.X, the name "a method for predicting the initiation of forging cracks in forged steel", the critical deformation surface can be deduced: the change law of the critical deformation is that the critical deformation increases with the increase of temperature. decreases and increases with the increase of strain rate. Therefore, it can be deduced that the "low temperature fast forging" method can control the forging crack initiation of forged 316LN steel. The rate of forging is in the order of 10 ^-2 -10 ^-1 . This method can increase the amount of deformation per fire, so that the total number of deformation fires is less, reducing energy consumption, shortening the forming cycle, reducing costs, improving efficiency and economic benefits. Furthermore, the initial forging temperature is reduced, the energy consumption is low, and the cost is low. Simultaneously, by adopting the method described in the present invention, no cracks will be produced, and the performance requirements of the workpiece can be met.

Description

A Method of Controlling Forging Crack Initiation of Forged 316LN Steel

technical field

The invention belongs to the technical field of forging technology, and in particular relates to a method for controlling the initiation of forging cracks in forged 316LN steel.

Background technique

At present, the method to solve the forging cracks of 316LN steel at home and abroad is high-temperature slow forging with multiple fires and small deformations, that is, forging starts at 1200°C±20°C, the strain rate is on the order of 10 ^-3 , and the amount of deformation each time is small. The tensile stress is also small, thus avoiding the generation of surface cracks. However, the disadvantages of this method are: high initial forging temperature, high energy consumption; small amount of deformation each time, many fire times, high energy consumption, long deformation cycle, high cost, low efficiency, and low economic benefit.

Contents of the invention

The purpose of the present invention is to provide a new method for controlling the initiation of forging cracks in 316LN steel against the shortcomings of the prior art, which can reduce energy consumption, shorten the forming cycle, reduce costs, and improve production efficiency and economic benefits.

The object of the invention is achieved in that way:

According to the critical deformation surface described in the application number 201310024108.X, titled "A Method for Predicting the Initiation of Forging Cracks in Forged Steel", it can be deduced that the change law of the critical deformation is that the critical deformation decreases with the increase of temperature. small and increases with the increase of strain rate. Therefore, it can be deduced that the method of "low temperature fast forging" can also control the forging crack initiation of forged 316LN steel. ℃, strain rate in the order of 10 ^-2 -10 ^-1 for forging.

The advantages and positive effects of the present invention are: the method of fast forging at low temperature can increase the amount of deformation per firing, so that the total number of deformation firings is less, energy consumption is reduced, forming cycle is shortened, costs are reduced, production efficiency and economic benefits are improved . Furthermore, the initial forging temperature is reduced, the energy consumption is low, and the cost is low. Simultaneously, by adopting the method described in the present invention, no cracks will be produced, and the performance requirements of the workpiece can be met.

Detailed ways

）倍，这样变形火次就会大大降低，能耗降低，成形周期缩短，成本降低、效率和经济效益大大提高。同时采用本发明所述的方法，同样不会产生裂纹，满足工件的性能要求。 Taking the upsetting of forged 316LN steel flat anvil as an example, the "high temperature slow forging" method is adopted. For example, when the initial forging temperature is 1200°C±20°C and the strain rate is 0.005s ^-1 , the critical deformation is about 0.58. In the "low temperature fast forging" method of the present invention, if the initial forging temperature is 1000°C±20°C and the strain rate is 0.5s ^-1 , the critical deformation is about 0.755. It can be seen that adopting the "low temperature fast forging" method of the present invention, the amount of deformation each time is 1.3 (

) times, so that the number of deformation fires will be greatly reduced, the energy consumption will be reduced, the forming cycle will be shortened, the cost will be reduced, and the efficiency and economic benefits will be greatly improved. Simultaneously, by adopting the method described in the present invention, no cracks will be produced, and the performance requirements of the workpiece can be met.

Claims (1)

1. control the method that crack initiation is made in forging attitude 316LN forging for one kind, it is characterized in that initial forging temperature is 1000 ℃ ± 20 ℃-1100 ℃ ± 20 ℃ when forging attitude 316LN steel is forged, strain rate is 10 ^-2-10 ^-1The order of magnitude.