Effect of Strain Aging on Yield Strength and Strain Hardening Rate of Dual Phase Steel and High Strength Low Alloy Steel
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摘要: 通过力学性能测试和显微组织观察研究了应变时效对双相钢和低合金高强钢屈服强度及应变硬化率的影响。结果表明: 经过2%预应变之后, 双相钢的屈服强度提高了106 MPa, 低合金高强钢的屈服强度提高了28 MPa; 预应变之后再经历烘烤, 双相钢的屈服强度提高了149 MPa, 而低合金高强钢的屈服强度只提高了66 MPa; 预应变或烘烤硬化之后, 两种钢的应变硬化率均降低, 但双相钢仍然具有很强的应变硬化能力, 其应变硬化率接近于低合金高强钢未预应变条件下的; 铁素体马氏体组织赋予了双相钢比低合金高强钢更强的应变硬化能力。Abstract: The effect of strain aging on yield strength and strain hardening rate of a dual phase steel and a high strength low alloy (HSLA) steel was studied by mechanical properties test and microstructure observation. The results show that the yield strength of the dual phase steel and the HSLA steel increased by 106 MPa and 28 MPa after 2% pre-strain. After pre-strain and bake, the yield strength of dual phase steel increased by 149 MPa, while yield strength of HSLA steel increased by 66 MPa only. After pre-strain or bake hardening, the strain hardening rate of both steels dropped, but the dual phase steel still had very high strain hardening ability close to the strain hardening rate of HSLA steel without pre-strain. It was ferrire-martensite that made the dual phase steel had higher strain hardening ability than the HSLA steel.
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