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Method for refining D406A steel welded unit crystalline grains through space temperature gradient thermal treatment

A technology of welding components and temperature gradients, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve the problems of poor comprehensive mechanical properties and low grain size, and achieve the effect of improved comprehensive mechanical properties, simple method and good use effect

Inactive Publication Date: 2014-08-27
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the problem that the existing D406A steel welded components have low grain size and poor comprehensive mechanical properties after heat treatment, and provides a method for refining the grains of D406A steel welded components by adopting spatial temperature gradient heat treatment

Method used

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  • Method for refining D406A steel welded unit crystalline grains through space temperature gradient thermal treatment
  • Method for refining D406A steel welded unit crystalline grains through space temperature gradient thermal treatment
  • Method for refining D406A steel welded unit crystalline grains through space temperature gradient thermal treatment

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specific Embodiment approach 1

[0013] Specific implementation mode 1: The method of using spatial temperature gradient heat treatment in this embodiment to refine the grains of D406A steel welded components is carried out according to the following steps:

[0014] 1. The first quenching: local heating of the weld zone of the D406A steel welded component, water cooling and heat dissipation of the base metal zone of the D406A steel welded component while heating, until the temperature of the weld zone of the D406A steel welded component rises from room temperature Heat preservation after rising to 920°C, stop water cooling and heat dissipation after heat preservation, and then perform oil cooling and quenching to room temperature to obtain welded components after the first quenching; the heat preservation time is based on the maximum thickness of the weld zone of D406A steel welded components Make sure that the holding time for each millimeter of thickness is 2 minutes to 3 minutes;

[0015] 2. The second que...

specific Embodiment approach 2

[0019] Embodiment 2: This embodiment differs from Embodiment 1 in that: the D406A steel welded member described in step 1 is in the form of thin strips. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0020] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the oil used in the oil cooling and quenching described in step 1 is No. 20 engine oil. Others are the same as in the first or second embodiment.

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Abstract

The invention provides a method for refining D406A steel welded unit crystalline grains through space temperature gradient thermal treatment, and relates to the field of metal thermal treatment, in particular to the method for refining the D406A steel welded unit crystalline grains through the space temperature gradient thermal treatment. The method aims at solving the problem that due to the fact that the grain size is low after thermal treatment is conducted on D406A steel welded units, the comprehensive mechanical property is poor. The method includes the steps of conducting water cooling while conducting temperature-variable circulating quenching thermal treatment on the D406A steel welded units, wherein the welded units are made to be at different temperatures in the length direction in the thermal treatment process from the weld joint area to the base metal area so that a temperature gradient field can be formed. The method is used for refining the D406A steel welded unit crystalline grains.

Description

technical field [0001] The invention relates to the field of metal heat treatment, in particular to a method for refining grains of D406A steel welded components by using space temperature gradient heat treatment. Background technique [0002] Low-alloy ultra-high-strength steel is a type of ultra-high-strength steel. Because of its relatively high strength and certain toughness, low content of alloy elements, simple thermal processing process and relatively low cost, it is widely used in aerospace, aviation and conventional weapons and other fields. D406A (30Si2MnCrMoVE) steel is an excellent low-alloy ultra-high-strength steel developed by my country, which is widely used in metal shells of aerospace vehicles. [0003] The traditional heat treatment of low-alloy ultra-high-strength steel is generally low-temperature tempering after quenching. These traditional processes cannot combine strength and ductility at the same time. However, some components are often subjected t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/50C21D1/18
Inventor 孙东立王清孙越麒韩秀丽王大群古腕力
Owner HARBIN INST OF TECH