阅读说明：本技术 热轧高强度带钢的低温残余应力调控方法 (The low temperature residual stress of hot-rolled high-strength strip regulates and controls method ) 是由 丁文红 王新东 齐建军 孙力 刘天武 袁飞 潘进 臧之祺 于 2019-08-26 设计创作，主要内容包括：本发明公开了一种热轧高强度带钢的低温残余应力调控方法,将热轧高强度带钢在室温下采用轧制方式进行预压缩处理,利用轧制过程中晶粒间的不协调变形,促进位错在晶界处塞积,提升晶界处空位及碳原子复合体的浓度,为晶粒内微区碳浓度的改变提供驱动力；将经过轧制变形处理的高强度带钢送入加热炉中,在100℃-450℃温度下进行回火处理,使位错、空位及碳原子复合体由晶界向晶粒内扩散,改变晶粒内微区碳浓度,促进碳化物的低温析出,实现残余应力低温调控；将热处理后的高强度带钢冷却至室温后卷取。该方法降低了回火温度,实现了低温残余应力调控,处理后高强钢内的残余应力可降低70％以上。(The invention discloses a kind of low temperature residual stress of hot-rolled high-strength strip to regulate and control method, rolling mode is used to carry out precompression treatment at room temperature hot-rolled high-strength strip, utilize Incoordinate deformation intercrystalline in the operation of rolling, promote dislocation in grain boundaries plug product, the concentration of grain boundaries vacancy and carbon atom complex is promoted, the change for microcell concentration of carbon in crystal grain provides driving force；It will be sent into heating furnace by the high-intensity band steel of rolling deformation processing, tempering is carried out at a temperature of 100 DEG C -450 DEG C, spread dislocation, vacancy and carbon atom complex into crystal grain from crystal boundary, change microcell concentration of carbon in crystal grain, promote the low temperature of carbide to be precipitated, realizes residual stress Low temperature regulation；It is batched after high-intensity band steel after heat treatment is cooled to room temperature.This method reduce tempering temperatures, realize the regulation of low temperature residual stress, and the residual stress after processing in high-strength steel can reduce by 70% or more.)

1. the low temperature residual stress of hot-rolled high-strength strip a kind of regulates and controls method, it is characterised in that: including step,

S1, hot-rolled high-strength strip is used rolling mode carry out precompression treatment at room temperature, utilizes crystal grain in the operation of rolling Between Incoordinate deformation, promote dislocation in grain boundaries plug product, promote the concentration of grain boundaries vacancy and carbon atom complex, be crystal grain The change of interior microcell concentration of carbon provides driving force；

S2, it will be sent into heating furnace by the high-intensity band steel of rolling deformation processing, be tempered at a temperature of 100 DEG C -450 DEG C Processing, spreads dislocation, vacancy and carbon atom complex into crystal grain from crystal boundary, changes microcell concentration of carbon in crystal grain, promotes carbon The low temperature of compound is precipitated, and realizes residual stress Low temperature regulation；

S3, it is batched after being cooled to room temperature the high-intensity band steel after heat treatment.

2. the low temperature residual stress of hot-rolled high-strength strip as described in claim 1 regulates and controls method, it is characterised in that: in step In S1, high-intensity band steel is thicker, and the compression ratio of rolling deformation is bigger.

3. the low temperature residual stress of hot-rolled high-strength strip as claimed in claim 1 or 2 regulates and controls method, it is characterised in that: In In step S1, the compression ratio of precompression treatment is carried out between 1%-15% using rolling mode at room temperature.

4. the low temperature residual stress of hot-rolled high-strength strip as described in claim 1 regulates and controls method, it is characterised in that: in step In S2, tempering temperature is related to the thickness of high-intensity band steel, and the tempering temperature of thick high-intensity band steel is at 450 DEG C hereinafter, thin The tempering temperature of high-intensity band steel is at 300 DEG C or less.

Technical field

The invention belongs to hot rolling fields, and in particular to a kind of low temperature residual stress regulation method of hot-rolled high-strength strip.

Background technique

Strip is used widely in industries such as automobile, crane arms, to mitigate self weight, improving safety of structure, work Journey machinery industry generally selects the high-intensity band steel of yield strength Re >=600MPa, the application of Re >=980MPa high-intensity band steel It is being stepped up.To reduce material cost, welding performance is promoted, is designed using low-alloy ingredient, passes through TMCP (Thermo Mechanical Control Process) and it is quickly cooled down technique refinement crystal grain, control precipitated phase, improve the obdurability of material Have become the main path of high-intensity band steel development of new generation.But technique is quickly cooled down while improving Fracture of Material, Also high residual stress is introduced in high-intensity band steel, makes the increasingly prominent of high-intensity band steel residual stress problems, shearing, folding The problems such as curved, the material deformation in welding process, size change even material cracks constantly annoyings the production of high-intensity band steel And enterprise is applied, for the residual stress level for reducing high-intensity band steel, it is attempted to the flatness control by preparation process Reduce the shape and size change during materials'use, but produces little effect, the one-pass molding qualification rate of part high-intensity band steel Lower than 60%.

Tempering is the universally recognized production technology for reducing high-strength steel residual stress level of current steel industry, occupies the country The enterprises such as the Sweden SSAB in high-end high-strength steel market, nippon, Baosteel all use tempering process to the remnants of high-strength steel Stress is regulated and controled, and tempering is that the high strength steel plate after hot rolling is heated to critical-temperature Ac1 (when steel heats, to initially form The temperature of austenite) a certain temperature below kept the temperature, to reduce the residual stress level of hot-rolling high-strength steel, after tempering Residual stress problems be substantially achieved control.But since the temperature of tempering is generally 650 DEG C -680 DEG C, still, test Data show that after 650 DEG C of tempering 30min, the residual stress in high-strength steel only reduces by 64.3%, and also result in material key The reduction of performance, moreover, high tempering also inevitably increase the production cost of high-strength steel, according to statistics for reducing The tempering cost of high-strength steel residual stress level is up to 300 yuan/ton of steel.In this background, industry an urgent demand is developed low Warm residual stress regulates and controls method, reduces the regulation and control cost of residual stress, improves the Key Performance Indicator of high-strength steel.

Summary of the invention

The object of the present invention is to provide a kind of low temperature residual stress of hot-rolled high-strength strip to regulate and control method, and this method will be pre- Deformation is combined with lonneal, reduces tempering temperature, realizes the regulation of low temperature residual stress, residual in high-strength steel after processing Residue stress can reduce by 70% or more.

The technical scheme adopted by the invention is that:

A kind of low temperature residual stress regulation method of hot-rolled high-strength strip, comprising steps of

S1, hot-rolled high-strength strip is used at room temperature rolling mode carry out precompression treatment, using in the operation of rolling Intercrystalline Incoordinate deformation promotes dislocation in grain boundaries plug product, promotes the concentration of grain boundaries vacancy and carbon atom complex, be The change of microcell concentration of carbon provides driving force in crystal grain；

S2, it will be sent into heating furnace by the high-intensity band steel of rolling deformation processing, carried out at a temperature of 100 DEG C -450 DEG C Tempering spreads dislocation, vacancy and carbon atom complex into crystal grain from crystal boundary, changes microcell concentration of carbon in crystal grain, promotees Low temperature into carbide is precipitated, and realizes residual stress Low temperature regulation；

S3, it is batched after being cooled to room temperature the high-intensity band steel after heat treatment.

In step sl, high-intensity band steel is thicker, and the compression ratio of rolling deformation is bigger.

In step sl, the compression ratio of precompression treatment is carried out between 1%-15% using rolling mode at room temperature.

In step s 2, tempering temperature is related to the thickness of high-intensity band steel, and the tempering temperature of thick high-intensity band steel exists 450 DEG C hereinafter, the tempering temperature of thin high-intensity band steel at 300 DEG C or less.

Advantageous effect of the invention is:

This method combines predeformation with lonneal, changes point of dislocation and carbide in the tissue by predeformation Cloth promotes the low temperature of the carbide in tempering to be precipitated, and then realizes the Low temperature regulation of residual stress, reduces tempering temperature, real Showed the regulation of low temperature residual stress, residual stress and elastic strain energy after processing in high-strength steel reduced before relatively handling 70% with On.

Detailed description of the invention

Fig. 1 is the schematic diagram of the embodiment of the present invention.

Fig. 2 is the dislocation and carbide of grain boundaries after step S1 processing, wherein (e) with (g) for after pre-treatment Dislocation is in grain boundaries plug product.

Fig. 3 is the distribution of carbide in step S2 drawing process, wherein (b) display is being tempered after pre-treatment In the process, the dislocation of grain boundaries is moved into crystal grain；(c) carbide of display grain boundaries is with dislocation and vacancy into crystal grain It is mobile；(e) there is crystal boundary migration during display lonneal.

Fig. 4 is using the high-strength residual stress of steel regulating effect of 16mm after this method.

Specific embodiment

The present invention is further illustrated with reference to the accompanying drawings and examples.

A kind of low temperature residual stress regulation method of hot-rolled high-strength strip, comprising steps of

S1, as shown in Figure 1, by hot-rolled high-strength strip use at room temperature rolling mode carry out 1%-15% compression at Reason, the compression ratio of the thicker rolling deformation of high-intensity band steel is bigger, utilizes Incoordinate deformation intercrystalline in the operation of rolling, such as Fig. 2 It is shown, promote dislocation in grain boundaries plug product, promote the concentration of grain boundaries vacancy and carbon atom complex, is that microcell carbon is dense in crystal grain The change of degree provides driving force；

S2, it will be sent into heating furnace by the high-intensity band steel of rolling deformation processing, carried out at a temperature of 100 DEG C -450 DEG C Tempering, the tempering temperature of thick high-intensity band steel is at 450 DEG C hereinafter, the tempering temperature of thin high-intensity band steel is at 300 DEG C Hereinafter, realize the Low temperature regulation of residual stress, as shown in figure 3, after pre-treatment, during lonneal, dislocation, Vacancy and carbon atom complex are spread from crystal boundary into crystal grain, Fig. 3 (c), promote to be gathered in the non-equilibrium carbide of grain boundaries to Diffusion in crystal grain, forms crystal boundary migration, Fig. 3 (b), Fig. 3 (e) realize the low temperature of carbide to change microcell concentration of carbon in crystal grain It is precipitated；

S3, it is batched after being cooled to room temperature the high-intensity band steel after heat treatment.

This method in such a way that tempering combines, changes dislocation and carbide in the tissue by predeformation predeformation Distribution, promote tempering when carbide low temperature be precipitated, and then realize residual stress Low temperature regulation, reduce tempering temperature Degree realizes the regulation of low temperature residual stress, as shown in figure 4, the residual stress and elastic strain energy after processing in high-strength steel compared with 70% or more is reduced before processing.

It should be understood that for those of ordinary skills, it can be modified or changed according to the above description, And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.