Alloying and Properties of As-cast Cold Work Cr5Mo1V Die Steel

Feng Guiceng; Zhang Jingyao

doi:10.15980/j.tzzz.2022.02.014

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Alloying and Properties of As-cast Cold Work Cr5Mo1V Die Steel
Vol. 42, Issue 2, Pages: 200-204(2022)
Published： 2022 ，
DOI： 10.15980/j.tzzz.2022.02.014

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Feng Guiceng, Zhang Jingyao. Alloying and Properties of As-cast Cold Work Cr5Mo1V Die Steel. [J]. Special Casting & Nonferrous Alloys 42(2):200-204(2022)
DOI：

Feng Guiceng, Zhang Jingyao. Alloying and Properties of As-cast Cold Work Cr5Mo1V Die Steel. [J]. Special Casting & Nonferrous Alloys 42(2):200-204(2022) DOI： 10.15980/j.tzzz.2022.02.014.

摘要

采用X射线衍射仪、光学显微镜、扫描电镜和透射电镜等手段，研究了Al含量对Cr5Mo1V模具钢显微组织和力学性能的影响，并分析了Al的作用机理。结果表明，铸态Cr5Mo1V-xAl模具钢的主要物相为α-Fe、γ-Fe和M

型碳化物，且随着Al含量增加，模具钢中珠光体面积分数先增大后减小，当Al质量分数增至1.2%时，开始出现δ-Fe相。未添加Al的回火态Cr5Mo1V模具钢中可见板条马氏体和次生碳化物；在Al含量为1.2%和1.5%时，可见局部细小孪晶和粗大碳化物。随着回火态Cr5Mo1V-xAl模具钢中Al含量从0增至1.5%

模具钢的抗拉强度、伸长率、冲击韧度和硬度呈现先增加后减小的特征，适宜的Al含量为1.2%

这主要与此时模具钢中形成了纳米孪晶、较多的次生碳化物和弥散分布的δ-Fe相有关。

Abstract

The effects of Al content on the microstructure and mechanical properties of Cr5 Mo1 V die steel were investigated by means of optical microscope

scanning electron microscope

transmission electron microscope and X-ray diffractometer

and the action mechanism of Al element was analyzed. The results indicate that the main phases of as-cast Cr5 Mo1 V-xAl die steel are composed of α-Fe

γ-Fe and M

carbide

and the area fraction of pearlite in the die steel is firstly increased and then decreased with the increase of Al content. As the Al content increases to 1.2%

the pearlite appears in the die steel. Lath martensite and secondary carbide can be observed in tempered Cr5 Mo1 V die steel without Al addition. When Al content is 1.2% or 1.5%

local fine twins and coarse carbides are generated. With the increase of Al content in tempered Cr5 Mo1 V-xAl die steel from 0 to 1.5%

the tensile strength

elongation

impact toughness and hardness of die steel are firstly increased and then decreased with the appropriate Al content of 1.2%

which is mainly attributed to the formation of nano twins

major secondary carbides and dispersed distribution of δ-Fe phase in die steel.